heap.c File Reference

#include "postgres.h"
#include "access/genam.h"
#include "access/htup_details.h"
#include "access/multixact.h"
#include "access/relation.h"
#include "access/sysattr.h"
#include "access/table.h"
#include "access/tableam.h"
#include "access/toast_compression.h"
#include "access/transam.h"
#include "access/xact.h"
#include "access/xlog.h"
#include "catalog/binary_upgrade.h"
#include "catalog/catalog.h"
#include "catalog/dependency.h"
#include "catalog/heap.h"
#include "catalog/index.h"
#include "catalog/objectaccess.h"
#include "catalog/partition.h"
#include "catalog/pg_am.h"
#include "catalog/pg_attrdef.h"
#include "catalog/pg_collation.h"
#include "catalog/pg_constraint.h"
#include "catalog/pg_foreign_table.h"
#include "catalog/pg_inherits.h"
#include "catalog/pg_namespace.h"
#include "catalog/pg_opclass.h"
#include "catalog/pg_partitioned_table.h"
#include "catalog/pg_statistic.h"
#include "catalog/pg_subscription_rel.h"
#include "catalog/pg_tablespace.h"
#include "catalog/pg_type.h"
#include "catalog/storage.h"
#include "catalog/storage_xlog.h"
#include "commands/tablecmds.h"
#include "commands/typecmds.h"
#include "executor/executor.h"
#include "miscadmin.h"
#include "nodes/nodeFuncs.h"
#include "optimizer/optimizer.h"
#include "parser/parse_coerce.h"
#include "parser/parse_collate.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "parser/parsetree.h"
#include "partitioning/partdesc.h"
#include "storage/lmgr.h"
#include "storage/predicate.h"
#include "storage/smgr.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/datum.h"
#include "utils/fmgroids.h"
#include "utils/inval.h"
#include "utils/lsyscache.h"
#include "utils/partcache.h"
#include "utils/ruleutils.h"
#include "utils/snapmgr.h"
#include "utils/syscache.h"

Include dependency graph for heap.c:

Go to the source code of this file.

Functions
static void	AddNewRelationTuple (Relation pg_class_desc, Relation new_rel_desc, Oid new_rel_oid, Oid new_type_oid, Oid reloftype, Oid relowner, char relkind, TransactionId relfrozenxid, TransactionId relminmxid, Datum relacl, Datum reloptions)
static ObjectAddress	AddNewRelationType (const char *typeName, Oid typeNamespace, Oid new_rel_oid, char new_rel_kind, Oid ownerid, Oid new_row_type, Oid new_array_type)
static void	RelationRemoveInheritance (Oid relid)
static Oid	StoreRelCheck (Relation rel, const char *ccname, Node *expr, bool is_validated, bool is_local, int inhcount, bool is_no_inherit, bool is_internal)
static void	StoreConstraints (Relation rel, List *cooked_constraints, bool is_internal)
static bool	MergeWithExistingConstraint (Relation rel, const char *ccname, Node *expr, bool allow_merge, bool is_local, bool is_initially_valid, bool is_no_inherit)
static void	SetRelationNumChecks (Relation rel, int numchecks)
static Node *	cookConstraint (ParseState *pstate, Node *raw_constraint, char *relname)
const FormData_pg_attribute *	SystemAttributeDefinition (AttrNumber attno)
const FormData_pg_attribute *	SystemAttributeByName (const char *attname)
Relation	heap_create (const char *relname, Oid relnamespace, Oid reltablespace, Oid relid, Oid relfilenode, Oid accessmtd, TupleDesc tupDesc, char relkind, char relpersistence, bool shared_relation, bool mapped_relation, bool allow_system_table_mods, TransactionId *relfrozenxid, MultiXactId *relminmxid)
void	CheckAttributeNamesTypes (TupleDesc tupdesc, char relkind, int flags)
void	CheckAttributeType (const char *attname, Oid atttypid, Oid attcollation, List *containing_rowtypes, int flags)
void	InsertPgAttributeTuples (Relation pg_attribute_rel, TupleDesc tupdesc, Oid new_rel_oid, Datum *attoptions, CatalogIndexState indstate)
static void	AddNewAttributeTuples (Oid new_rel_oid, TupleDesc tupdesc, char relkind)
void	InsertPgClassTuple (Relation pg_class_desc, Relation new_rel_desc, Oid new_rel_oid, Datum relacl, Datum reloptions)
Oid	heap_create_with_catalog (const char *relname, Oid relnamespace, Oid reltablespace, Oid relid, Oid reltypeid, Oid reloftypeid, Oid ownerid, Oid accessmtd, TupleDesc tupdesc, List *cooked_constraints, char relkind, char relpersistence, bool shared_relation, bool mapped_relation, OnCommitAction oncommit, Datum reloptions, bool use_user_acl, bool allow_system_table_mods, bool is_internal, Oid relrewrite, ObjectAddress *typaddress)
void	DeleteRelationTuple (Oid relid)
void	DeleteAttributeTuples (Oid relid)
void	DeleteSystemAttributeTuples (Oid relid)
void	RemoveAttributeById (Oid relid, AttrNumber attnum)
void	RemoveAttrDefault (Oid relid, AttrNumber attnum, DropBehavior behavior, bool complain, bool internal)
void	RemoveAttrDefaultById (Oid attrdefId)
void	heap_drop_with_catalog (Oid relid)
void	RelationClearMissing (Relation rel)
void	SetAttrMissing (Oid relid, char *attname, char *value)
Oid	StoreAttrDefault (Relation rel, AttrNumber attnum, Node *expr, bool is_internal, bool add_column_mode)
List *	AddRelationNewConstraints (Relation rel, List *newColDefaults, List *newConstraints, bool allow_merge, bool is_local, bool is_internal, const char *queryString)
static bool	check_nested_generated_walker (Node *node, void *context)
static void	check_nested_generated (ParseState *pstate, Node *node)
Node *	cookDefault (ParseState *pstate, Node *raw_default, Oid atttypid, int32 atttypmod, const char *attname, char attgenerated)
void	CopyStatistics (Oid fromrelid, Oid torelid)
void	RemoveStatistics (Oid relid, AttrNumber attnum)
static void	RelationTruncateIndexes (Relation heapRelation)
void	heap_truncate (List *relids)
void	heap_truncate_one_rel (Relation rel)
void	heap_truncate_check_FKs (List *relations, bool tempTables)
List *	heap_truncate_find_FKs (List *relationIds)
void	StorePartitionKey (Relation rel, char strategy, int16 partnatts, AttrNumber *partattrs, List *partexprs, Oid *partopclass, Oid *partcollation)
void	RemovePartitionKeyByRelId (Oid relid)
void	StorePartitionBound (Relation rel, Relation parent, PartitionBoundSpec *bound)

Variables
Oid	binary_upgrade_next_heap_pg_class_oid = InvalidOid
Oid	binary_upgrade_next_toast_pg_class_oid = InvalidOid
static const FormData_pg_attribute	a1
static const FormData_pg_attribute	a2
static const FormData_pg_attribute	a3
static const FormData_pg_attribute	a4
static const FormData_pg_attribute	a5
static const FormData_pg_attribute	a6
static const FormData_pg_attribute *	SysAtt [] = {&a1, &a2, &a3, &a4, &a5, &a6}

Function Documentation

AddNewAttributeTuples()

static void AddNewAttributeTuples ( Oid  new_rel_oid, TupleDesc  tupdesc, char  relkind  )

static

Definition at line 843 of file heap.c.

References TupleDescData::attrs, CatalogCloseIndexes(), CatalogOpenIndexes(), CreateTupleDesc(), DEPENDENCY_NORMAL, FormData_pg_attribute, FreeTupleDesc(), i, InsertPgAttributeTuples(), lengthof, TupleDescData::natts, ObjectAddressSet, ObjectAddressSubSet, OidIsValid, recordDependencyOn(), RowExclusiveLock, SysAtt, table_close(), and table_open().

Referenced by heap_create_with_catalog().

{
    Relation    rel;
    CatalogIndexState indstate;
    int         natts = tupdesc->natts;
    ObjectAddress myself,
                referenced;

    /*
     * open pg_attribute and its indexes.
     */
    rel = table_open(AttributeRelationId, RowExclusiveLock);

    indstate = CatalogOpenIndexes(rel);

    /* set stats detail level to a sane default */
    for (int i = 0; i < natts; i++)
        tupdesc->attrs[i].attstattarget = -1;
    InsertPgAttributeTuples(rel, tupdesc, new_rel_oid, NULL, indstate);

    /* add dependencies on their datatypes and collations */
    for (int i = 0; i < natts; i++)
    {
        /* Add dependency info */
        ObjectAddressSubSet(myself, RelationRelationId, new_rel_oid, i + 1);
        ObjectAddressSet(referenced, TypeRelationId,
                         tupdesc->attrs[i].atttypid);
        recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);

        /* The default collation is pinned, so don't bother recording it */
        if (OidIsValid(tupdesc->attrs[i].attcollation) &&
            tupdesc->attrs[i].attcollation != DEFAULT_COLLATION_OID)
        {
            ObjectAddressSet(referenced, CollationRelationId,
                             tupdesc->attrs[i].attcollation);
            recordDependencyOn(&myself, &referenced, DEPENDENCY_NORMAL);
        }
    }

    /*
     * Next we add the system attributes.  Skip OID if rel has no OIDs. Skip
     * all for a view or type relation.  We don't bother with making datatype
     * dependencies here, since presumably all these types are pinned.
     */
    if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE)
    {
        TupleDesc   td;

        td = CreateTupleDesc(lengthof(SysAtt), (FormData_pg_attribute **) &SysAtt);

        InsertPgAttributeTuples(rel, td, new_rel_oid, NULL, indstate);
        FreeTupleDesc(td);
    }

    /*
     * clean up
     */
    CatalogCloseIndexes(indstate);

    table_close(rel, RowExclusiveLock);
}

AddNewRelationTuple()

static void AddNewRelationTuple ( Relation  pg_class_desc, Relation  new_rel_desc, Oid  new_rel_oid, Oid  new_type_oid, Oid  reloftype, Oid  relowner, char  relkind, TransactionId  relfrozenxid, TransactionId  relminmxid, Datum  relacl, Datum  reloptions  )

static

Definition at line 994 of file heap.c.

References InsertPgClassTuple(), RelationData::rd_att, RelationData::rd_rel, TupleDescData::tdtypeid, and TupleDescData::tdtypmod.

Referenced by heap_create_with_catalog().

{
    Form_pg_class new_rel_reltup;

    /*
     * first we update some of the information in our uncataloged relation's
     * relation descriptor.
     */
    new_rel_reltup = new_rel_desc->rd_rel;

    switch (relkind)
    {
        case RELKIND_RELATION:
        case RELKIND_MATVIEW:
        case RELKIND_INDEX:
        case RELKIND_TOASTVALUE:
            /* The relation is real, but as yet empty */
            new_rel_reltup->relpages = 0;
            new_rel_reltup->reltuples = -1;
            new_rel_reltup->relallvisible = 0;
            break;
        case RELKIND_SEQUENCE:
            /* Sequences always have a known size */
            new_rel_reltup->relpages = 1;
            new_rel_reltup->reltuples = 1;
            new_rel_reltup->relallvisible = 0;
            break;
        default:
            /* Views, etc, have no disk storage */
            new_rel_reltup->relpages = 0;
            new_rel_reltup->reltuples = -1;
            new_rel_reltup->relallvisible = 0;
            break;
    }

    new_rel_reltup->relfrozenxid = relfrozenxid;
    new_rel_reltup->relminmxid = relminmxid;
    new_rel_reltup->relowner = relowner;
    new_rel_reltup->reltype = new_type_oid;
    new_rel_reltup->reloftype = reloftype;

    /* relispartition is always set by updating this tuple later */
    new_rel_reltup->relispartition = false;

    /* fill rd_att's type ID with something sane even if reltype is zero */
    new_rel_desc->rd_att->tdtypeid = new_type_oid ? new_type_oid : RECORDOID;
    new_rel_desc->rd_att->tdtypmod = -1;

    /* Now build and insert the tuple */
    InsertPgClassTuple(pg_class_desc, new_rel_desc, new_rel_oid,
                       relacl, reloptions);
}

AddNewRelationType()

static ObjectAddress AddNewRelationType ( const char *  typeName, Oid  typeNamespace, Oid  new_rel_oid, char  new_rel_kind, Oid  ownerid, Oid  new_row_type, Oid  new_array_type  )

static

Definition at line 1065 of file heap.c.

References DEFAULT_TYPDELIM, InvalidOid, and TypeCreate().

Referenced by heap_create_with_catalog().

{
    return
        TypeCreate(new_row_type,    /* optional predetermined OID */
                   typeName,    /* type name */
                   typeNamespace,   /* type namespace */
                   new_rel_oid, /* relation oid */
                   new_rel_kind,    /* relation kind */
                   ownerid,     /* owner's ID */
                   -1,          /* internal size (varlena) */
                   TYPTYPE_COMPOSITE,   /* type-type (composite) */
                   TYPCATEGORY_COMPOSITE,   /* type-category (ditto) */
                   false,       /* composite types are never preferred */
                   DEFAULT_TYPDELIM,    /* default array delimiter */
                   F_RECORD_IN, /* input procedure */
                   F_RECORD_OUT,    /* output procedure */
                   F_RECORD_RECV,   /* receive procedure */
                   F_RECORD_SEND,   /* send procedure */
                   InvalidOid,  /* typmodin procedure - none */
                   InvalidOid,  /* typmodout procedure - none */
                   InvalidOid,  /* analyze procedure - default */
                   InvalidOid,  /* subscript procedure - none */
                   InvalidOid,  /* array element type - irrelevant */
                   false,       /* this is not an array type */
                   new_array_type,  /* array type if any */
                   InvalidOid,  /* domain base type - irrelevant */
                   NULL,        /* default value - none */
                   NULL,        /* default binary representation */
                   false,       /* passed by reference */
                   TYPALIGN_DOUBLE, /* alignment - must be the largest! */
                   TYPSTORAGE_EXTENDED, /* fully TOASTable */
                   -1,          /* typmod */
                   0,           /* array dimensions for typBaseType */
                   false,       /* Type NOT NULL */
                   InvalidOid); /* rowtypes never have a collation */
}

AddRelationNewConstraints()

List* AddRelationNewConstraints	(	Relation	rel,
		List *	newColDefaults,
		List *	newConstraints,
		bool	allow_merge,
		bool	is_local,
		bool	is_internal,
		const char *	queryString
	)

Definition at line 2581 of file heap.c.

References AccessShareLock, addNSItemToQuery(), addRangeTableEntryForRelation(), Assert, RawColumnDefault::attnum, CookedConstraint::attnum, castNode, ChooseConstraintName(), Constraint::conname, CookedConstraint::conoid, TupleDescData::constr, CONSTR_CHECK, CONSTR_DEFAULT, contain_volatile_functions(), CookedConstraint::contype, Constraint::contype, cookConstraint(), cookDefault(), Constraint::cooked_expr, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, CookedConstraint::expr, RawColumnDefault::generated, get_attname(), CookedConstraint::inhcount, Constraint::initially_valid, CookedConstraint::is_local, CookedConstraint::is_no_inherit, Constraint::is_no_inherit, IsA, lappend(), lfirst, linitial, list_length(), list_union(), make_parsestate(), MergeWithExistingConstraint(), RawColumnDefault::missingMode, CookedConstraint::name, NameStr, NIL, TupleConstr::num_check, ParseState::p_sourcetext, palloc(), pull_var_clause(), RawColumnDefault::raw_default, Constraint::raw_expr, RelationData::rd_att, RelationGetDescr, RelationGetNamespace, RelationGetRelationName, RelationGetRelid, SetRelationNumChecks(), CookedConstraint::skip_validation, Constraint::skip_validation, StoreAttrDefault(), StoreRelCheck(), stringToNode(), and TupleDescAttr.

Referenced by ATAddCheckConstraint(), ATExecAddColumn(), ATExecColumnDefault(), and DefineRelation().

{
    List       *cookedConstraints = NIL;
    TupleDesc   tupleDesc;
    TupleConstr *oldconstr;
    int         numoldchecks;
    ParseState *pstate;
    ParseNamespaceItem *nsitem;
    int         numchecks;
    List       *checknames;
    ListCell   *cell;
    Node       *expr;
    CookedConstraint *cooked;

    /*
     * Get info about existing constraints.
     */
    tupleDesc = RelationGetDescr(rel);
    oldconstr = tupleDesc->constr;
    if (oldconstr)
        numoldchecks = oldconstr->num_check;
    else
        numoldchecks = 0;

    /*
     * Create a dummy ParseState and insert the target relation as its sole
     * rangetable entry.  We need a ParseState for transformExpr.
     */
    pstate = make_parsestate(NULL);
    pstate->p_sourcetext = queryString;
    nsitem = addRangeTableEntryForRelation(pstate,
                                           rel,
                                           AccessShareLock,
                                           NULL,
                                           false,
                                           true);
    addNSItemToQuery(pstate, nsitem, true, true, true);

    /*
     * Process column default expressions.
     */
    foreach(cell, newColDefaults)
    {
        RawColumnDefault *colDef = (RawColumnDefault *) lfirst(cell);
        Form_pg_attribute atp = TupleDescAttr(rel->rd_att, colDef->attnum - 1);
        Oid         defOid;

        expr = cookDefault(pstate, colDef->raw_default,
                           atp->atttypid, atp->atttypmod,
                           NameStr(atp->attname),
                           atp->attgenerated);

        /*
         * If the expression is just a NULL constant, we do not bother to make
         * an explicit pg_attrdef entry, since the default behavior is
         * equivalent.  This applies to column defaults, but not for
         * generation expressions.
         *
         * Note a nonobvious property of this test: if the column is of a
         * domain type, what we'll get is not a bare null Const but a
         * CoerceToDomain expr, so we will not discard the default.  This is
         * critical because the column default needs to be retained to
         * override any default that the domain might have.
         */
        if (expr == NULL ||
            (!colDef->generated &&
             IsA(expr, Const) &&
             castNode(Const, expr)->constisnull))
            continue;

        /* If the DEFAULT is volatile we cannot use a missing value */
        if (colDef->missingMode && contain_volatile_functions((Node *) expr))
            colDef->missingMode = false;

        defOid = StoreAttrDefault(rel, colDef->attnum, expr, is_internal,
                                  colDef->missingMode);

        cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
        cooked->contype = CONSTR_DEFAULT;
        cooked->conoid = defOid;
        cooked->name = NULL;
        cooked->attnum = colDef->attnum;
        cooked->expr = expr;
        cooked->skip_validation = false;
        cooked->is_local = is_local;
        cooked->inhcount = is_local ? 0 : 1;
        cooked->is_no_inherit = false;
        cookedConstraints = lappend(cookedConstraints, cooked);
    }

    /*
     * Process constraint expressions.
     */
    numchecks = numoldchecks;
    checknames = NIL;
    foreach(cell, newConstraints)
    {
        Constraint *cdef = (Constraint *) lfirst(cell);
        char       *ccname;
        Oid         constrOid;

        if (cdef->contype != CONSTR_CHECK)
            continue;

        if (cdef->raw_expr != NULL)
        {
            Assert(cdef->cooked_expr == NULL);

            /*
             * Transform raw parsetree to executable expression, and verify
             * it's valid as a CHECK constraint.
             */
            expr = cookConstraint(pstate, cdef->raw_expr,
                                  RelationGetRelationName(rel));
        }
        else
        {
            Assert(cdef->cooked_expr != NULL);

            /*
             * Here, we assume the parser will only pass us valid CHECK
             * expressions, so we do no particular checking.
             */
            expr = stringToNode(cdef->cooked_expr);
        }

        /*
         * Check name uniqueness, or generate a name if none was given.
         */
        if (cdef->conname != NULL)
        {
            ListCell   *cell2;

            ccname = cdef->conname;
            /* Check against other new constraints */
            /* Needed because we don't do CommandCounterIncrement in loop */
            foreach(cell2, checknames)
            {
                if (strcmp((char *) lfirst(cell2), ccname) == 0)
                    ereport(ERROR,
                            (errcode(ERRCODE_DUPLICATE_OBJECT),
                             errmsg("check constraint \"%s\" already exists",
                                    ccname)));
            }

            /* save name for future checks */
            checknames = lappend(checknames, ccname);

            /*
             * Check against pre-existing constraints.  If we are allowed to
             * merge with an existing constraint, there's no more to do here.
             * (We omit the duplicate constraint from the result, which is
             * what ATAddCheckConstraint wants.)
             */
            if (MergeWithExistingConstraint(rel, ccname, expr,
                                            allow_merge, is_local,
                                            cdef->initially_valid,
                                            cdef->is_no_inherit))
                continue;
        }
        else
        {
            /*
             * When generating a name, we want to create "tab_col_check" for a
             * column constraint and "tab_check" for a table constraint.  We
             * no longer have any info about the syntactic positioning of the
             * constraint phrase, so we approximate this by seeing whether the
             * expression references more than one column.  (If the user
             * played by the rules, the result is the same...)
             *
             * Note: pull_var_clause() doesn't descend into sublinks, but we
             * eliminated those above; and anyway this only needs to be an
             * approximate answer.
             */
            List       *vars;
            char       *colname;

            vars = pull_var_clause(expr, 0);

            /* eliminate duplicates */
            vars = list_union(NIL, vars);

            if (list_length(vars) == 1)
                colname = get_attname(RelationGetRelid(rel),
                                      ((Var *) linitial(vars))->varattno,
                                      true);
            else
                colname = NULL;

            ccname = ChooseConstraintName(RelationGetRelationName(rel),
                                          colname,
                                          "check",
                                          RelationGetNamespace(rel),
                                          checknames);

            /* save name for future checks */
            checknames = lappend(checknames, ccname);
        }

        /*
         * OK, store it.
         */
        constrOid =
            StoreRelCheck(rel, ccname, expr, cdef->initially_valid, is_local,
                          is_local ? 0 : 1, cdef->is_no_inherit, is_internal);

        numchecks++;

        cooked = (CookedConstraint *) palloc(sizeof(CookedConstraint));
        cooked->contype = CONSTR_CHECK;
        cooked->conoid = constrOid;
        cooked->name = ccname;
        cooked->attnum = 0;
        cooked->expr = expr;
        cooked->skip_validation = cdef->skip_validation;
        cooked->is_local = is_local;
        cooked->inhcount = is_local ? 0 : 1;
        cooked->is_no_inherit = cdef->is_no_inherit;
        cookedConstraints = lappend(cookedConstraints, cooked);
    }

    /*
     * Update the count of constraints in the relation's pg_class tuple. We do
     * this even if there was no change, in order to ensure that an SI update
     * message is sent out for the pg_class tuple, which will force other
     * backends to rebuild their relcache entries for the rel. (This is
     * critical if we added defaults but not constraints.)
     */
    SetRelationNumChecks(rel, numchecks);

    return cookedConstraints;
}

check_nested_generated()

static void check_nested_generated ( ParseState *  pstate, Node *  node  )

static

Definition at line 3057 of file heap.c.

References check_nested_generated_walker().

Referenced by cookDefault().

{
    check_nested_generated_walker(node, pstate);
}

check_nested_generated_walker()

static bool check_nested_generated_walker ( Node *  node, void *  context  )

static

Definition at line 3015 of file heap.c.

References attnum, ereport, errcode(), errdetail(), errmsg(), ERROR, expression_tree_walker(), get_attgenerated(), get_attname(), IsA, Var::location, OidIsValid, ParseState::p_rtable, parser_errposition(), rt_fetch, Var::varattno, and Var::varno.

Referenced by check_nested_generated().

{
    ParseState *pstate = context;

    if (node == NULL)
        return false;
    else if (IsA(node, Var))
    {
        Var        *var = (Var *) node;
        Oid         relid;
        AttrNumber  attnum;

        relid = rt_fetch(var->varno, pstate->p_rtable)->relid;
        if (!OidIsValid(relid))
            return false;       /* XXX shouldn't we raise an error? */

        attnum = var->varattno;

        if (attnum > 0 && get_attgenerated(relid, attnum))
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("cannot use generated column \"%s\" in column generation expression",
                            get_attname(relid, attnum, false)),
                     errdetail("A generated column cannot reference another generated column."),
                     parser_errposition(pstate, var->location)));
        /* A whole-row Var is necessarily self-referential, so forbid it */
        if (attnum == 0)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("cannot use whole-row variable in column generation expression"),
                     errdetail("This would cause the generated column to depend on its own value."),
                     parser_errposition(pstate, var->location)));
        /* System columns were already checked in the parser */

        return false;
    }
    else
        return expression_tree_walker(node, check_nested_generated_walker,
                                      (void *) context);
}

CheckAttributeNamesTypes()

void CheckAttributeNamesTypes	(	TupleDesc	tupdesc,
		char	relkind,
		int	flags
	)

Definition at line 498 of file heap.c.

References attname, CheckAttributeType(), ereport, errcode(), errmsg(), ERROR, i, MaxHeapAttributeNumber, NameStr, TupleDescData::natts, NIL, SystemAttributeByName(), and TupleDescAttr.

Referenced by addRangeTableEntryForFunction(), and heap_create_with_catalog().

{
    int         i;
    int         j;
    int         natts = tupdesc->natts;

    /* Sanity check on column count */
    if (natts < 0 || natts > MaxHeapAttributeNumber)
        ereport(ERROR,
                (errcode(ERRCODE_TOO_MANY_COLUMNS),
                 errmsg("tables can have at most %d columns",
                        MaxHeapAttributeNumber)));

    /*
     * first check for collision with system attribute names
     *
     * Skip this for a view or type relation, since those don't have system
     * attributes.
     */
    if (relkind != RELKIND_VIEW && relkind != RELKIND_COMPOSITE_TYPE)
    {
        for (i = 0; i < natts; i++)
        {
            Form_pg_attribute attr = TupleDescAttr(tupdesc, i);

            if (SystemAttributeByName(NameStr(attr->attname)) != NULL)
                ereport(ERROR,
                        (errcode(ERRCODE_DUPLICATE_COLUMN),
                         errmsg("column name \"%s\" conflicts with a system column name",
                                NameStr(attr->attname))));
        }
    }

    /*
     * next check for repeated attribute names
     */
    for (i = 1; i < natts; i++)
    {
        for (j = 0; j < i; j++)
        {
            if (strcmp(NameStr(TupleDescAttr(tupdesc, j)->attname),
                       NameStr(TupleDescAttr(tupdesc, i)->attname)) == 0)
                ereport(ERROR,
                        (errcode(ERRCODE_DUPLICATE_COLUMN),
                         errmsg("column name \"%s\" specified more than once",
                                NameStr(TupleDescAttr(tupdesc, j)->attname))));
        }
    }

    /*
     * next check the attribute types
     */
    for (i = 0; i < natts; i++)
    {
        CheckAttributeType(NameStr(TupleDescAttr(tupdesc, i)->attname),
                           TupleDescAttr(tupdesc, i)->atttypid,
                           TupleDescAttr(tupdesc, i)->attcollation,
                           NIL, /* assume we're creating a new rowtype */
                           flags);
    }
}

CheckAttributeType()

void CheckAttributeType	(	const char *	attname,
		Oid	atttypid,
		Oid	attcollation,
		List *	containing_rowtypes,
		int	flags
	)

Definition at line 590 of file heap.c.

References AccessShareLock, CheckAttributeType(), CHKATYPE_ANYARRAY, CHKATYPE_ANYRECORD, CHKATYPE_IS_PARTKEY, ereport, errcode(), errhint(), errmsg(), ERROR, format_type_be(), get_element_type(), get_range_collation(), get_range_subtype(), get_typ_typrelid(), get_typtype(), getBaseType(), i, lappend_oid(), list_delete_last(), list_member_oid(), NameStr, TupleDescData::natts, OidIsValid, relation_close(), relation_open(), RelationGetDescr, TupleDescAttr, and type_is_collatable().

Referenced by ATExecAddColumn(), ATPrepAlterColumnType(), CheckAttributeNamesTypes(), CheckAttributeType(), ComputePartitionAttrs(), and ConstructTupleDescriptor().

{
    char        att_typtype = get_typtype(atttypid);
    Oid         att_typelem;

    if (att_typtype == TYPTYPE_PSEUDO)
    {
        /*
         * We disallow pseudo-type columns, with the exception of ANYARRAY,
         * RECORD, and RECORD[] when the caller says that those are OK.
         *
         * We don't need to worry about recursive containment for RECORD and
         * RECORD[] because (a) no named composite type should be allowed to
         * contain those, and (b) two "anonymous" record types couldn't be
         * considered to be the same type, so infinite recursion isn't
         * possible.
         */
        if (!((atttypid == ANYARRAYOID && (flags & CHKATYPE_ANYARRAY)) ||
              (atttypid == RECORDOID && (flags & CHKATYPE_ANYRECORD)) ||
              (atttypid == RECORDARRAYOID && (flags & CHKATYPE_ANYRECORD))))
        {
            if (flags & CHKATYPE_IS_PARTKEY)
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
                /* translator: first %s is an integer not a name */
                         errmsg("partition key column %s has pseudo-type %s",
                                attname, format_type_be(atttypid))));
            else
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
                         errmsg("column \"%s\" has pseudo-type %s",
                                attname, format_type_be(atttypid))));
        }
    }
    else if (att_typtype == TYPTYPE_DOMAIN)
    {
        /*
         * If it's a domain, recurse to check its base type.
         */
        CheckAttributeType(attname, getBaseType(atttypid), attcollation,
                           containing_rowtypes,
                           flags);
    }
    else if (att_typtype == TYPTYPE_COMPOSITE)
    {
        /*
         * For a composite type, recurse into its attributes.
         */
        Relation    relation;
        TupleDesc   tupdesc;
        int         i;

        /*
         * Check for self-containment.  Eventually we might be able to allow
         * this (just return without complaint, if so) but it's not clear how
         * many other places would require anti-recursion defenses before it
         * would be safe to allow tables to contain their own rowtype.
         */
        if (list_member_oid(containing_rowtypes, atttypid))
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
                     errmsg("composite type %s cannot be made a member of itself",
                            format_type_be(atttypid))));

        containing_rowtypes = lappend_oid(containing_rowtypes, atttypid);

        relation = relation_open(get_typ_typrelid(atttypid), AccessShareLock);

        tupdesc = RelationGetDescr(relation);

        for (i = 0; i < tupdesc->natts; i++)
        {
            Form_pg_attribute attr = TupleDescAttr(tupdesc, i);

            if (attr->attisdropped)
                continue;
            CheckAttributeType(NameStr(attr->attname),
                               attr->atttypid, attr->attcollation,
                               containing_rowtypes,
                               flags & ~CHKATYPE_IS_PARTKEY);
        }

        relation_close(relation, AccessShareLock);

        containing_rowtypes = list_delete_last(containing_rowtypes);
    }
    else if (att_typtype == TYPTYPE_RANGE)
    {
        /*
         * If it's a range, recurse to check its subtype.
         */
        CheckAttributeType(attname, get_range_subtype(atttypid),
                           get_range_collation(atttypid),
                           containing_rowtypes,
                           flags);
    }
    else if (OidIsValid((att_typelem = get_element_type(atttypid))))
    {
        /*
         * Must recurse into array types, too, in case they are composite.
         */
        CheckAttributeType(attname, att_typelem, attcollation,
                           containing_rowtypes,
                           flags);
    }

    /*
     * This might not be strictly invalid per SQL standard, but it is pretty
     * useless, and it cannot be dumped, so we must disallow it.
     */
    if (!OidIsValid(attcollation) && type_is_collatable(atttypid))
    {
        if (flags & CHKATYPE_IS_PARTKEY)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
            /* translator: first %s is an integer not a name */
                     errmsg("no collation was derived for partition key column %s with collatable type %s",
                            attname, format_type_be(atttypid)),
                     errhint("Use the COLLATE clause to set the collation explicitly.")));
        else
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
                     errmsg("no collation was derived for column \"%s\" with collatable type %s",
                            attname, format_type_be(atttypid)),
                     errhint("Use the COLLATE clause to set the collation explicitly.")));
    }
}

cookConstraint()

static Node * cookConstraint ( ParseState *  pstate, Node *  raw_constraint, char *  relname  )

static

Definition at line 3150 of file heap.c.

References assign_expr_collations(), coerce_to_boolean(), ereport, errcode(), errmsg(), ERROR, EXPR_KIND_CHECK_CONSTRAINT, list_length(), ParseState::p_rtable, and transformExpr().

Referenced by AddRelationNewConstraints().

{
    Node       *expr;

    /*
     * Transform raw parsetree to executable expression.
     */
    expr = transformExpr(pstate, raw_constraint, EXPR_KIND_CHECK_CONSTRAINT);

    /*
     * Make sure it yields a boolean result.
     */
    expr = coerce_to_boolean(pstate, expr, "CHECK");

    /*
     * Take care of collations.
     */
    assign_expr_collations(pstate, expr);

    /*
     * Make sure no outside relations are referred to (this is probably dead
     * code now that add_missing_from is history).
     */
    if (list_length(pstate->p_rtable) != 1)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_COLUMN_REFERENCE),
                 errmsg("only table \"%s\" can be referenced in check constraint",
                        relname)));

    return expr;
}

cookDefault()

Node* cookDefault	(	ParseState *	pstate,
		Node *	raw_default,
		Oid	atttypid,
		int32	atttypmod,
		const char *	attname,
		char	attgenerated
	)

Definition at line 3075 of file heap.c.

References Assert, assign_expr_collations(), check_nested_generated(), COERCE_IMPLICIT_CAST, coerce_to_target_type(), COERCION_ASSIGNMENT, contain_mutable_functions(), contain_var_clause(), ereport, errcode(), errhint(), errmsg(), ERROR, EXPR_KIND_COLUMN_DEFAULT, EXPR_KIND_GENERATED_COLUMN, exprType(), format_type_be(), OidIsValid, and transformExpr().

Referenced by AddRelationNewConstraints(), AlterDomainDefault(), and DefineDomain().

{
    Node       *expr;

    Assert(raw_default != NULL);

    /*
     * Transform raw parsetree to executable expression.
     */
    expr = transformExpr(pstate, raw_default, attgenerated ? EXPR_KIND_GENERATED_COLUMN : EXPR_KIND_COLUMN_DEFAULT);

    if (attgenerated)
    {
        check_nested_generated(pstate, expr);

        if (contain_mutable_functions(expr))
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("generation expression is not immutable")));
    }
    else
    {
        /*
         * For a default expression, transformExpr() should have rejected
         * column references.
         */
        Assert(!contain_var_clause(expr));
    }

    /*
     * Coerce the expression to the correct type and typmod, if given. This
     * should match the parser's processing of non-defaulted expressions ---
     * see transformAssignedExpr().
     */
    if (OidIsValid(atttypid))
    {
        Oid         type_id = exprType(expr);

        expr = coerce_to_target_type(pstate, expr, type_id,
                                     atttypid, atttypmod,
                                     COERCION_ASSIGNMENT,
                                     COERCE_IMPLICIT_CAST,
                                     -1);
        if (expr == NULL)
            ereport(ERROR,
                    (errcode(ERRCODE_DATATYPE_MISMATCH),
                     errmsg("column \"%s\" is of type %s"
                            " but default expression is of type %s",
                            attname,
                            format_type_be(atttypid),
                            format_type_be(type_id)),
                     errhint("You will need to rewrite or cast the expression.")));
    }

    /*
     * Finally, take care of collations in the finished expression.
     */
    assign_expr_collations(pstate, expr);

    return expr;
}

CopyStatistics()

void CopyStatistics	(	Oid	fromrelid,
		Oid	torelid
	)

Definition at line 3188 of file heap.c.

References BTEqualStrategyNumber, CatalogTupleInsert(), GETSTRUCT, heap_copytuple(), heap_freetuple(), HeapTupleIsValid, sort-test::key, ObjectIdGetDatum, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by index_concurrently_swap().

{
    HeapTuple   tup;
    SysScanDesc scan;
    ScanKeyData key[1];
    Relation    statrel;

    statrel = table_open(StatisticRelationId, RowExclusiveLock);

    /* Now search for stat records */
    ScanKeyInit(&key[0],
                Anum_pg_statistic_starelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(fromrelid));

    scan = systable_beginscan(statrel, StatisticRelidAttnumInhIndexId,
                              true, NULL, 1, key);

    while (HeapTupleIsValid((tup = systable_getnext(scan))))
    {
        Form_pg_statistic statform;

        /* make a modifiable copy */
        tup = heap_copytuple(tup);
        statform = (Form_pg_statistic) GETSTRUCT(tup);

        /* update the copy of the tuple and insert it */
        statform->starelid = torelid;
        CatalogTupleInsert(statrel, tup);

        heap_freetuple(tup);
    }

    systable_endscan(scan);

    table_close(statrel, RowExclusiveLock);
}

DeleteAttributeTuples()

void DeleteAttributeTuples

(

Oid

relid

)

Definition at line 1583 of file heap.c.

References BTEqualStrategyNumber, CatalogTupleDelete(), sort-test::key, ObjectIdGetDatum, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by heap_drop_with_catalog(), and index_drop().

{
    Relation    attrel;
    SysScanDesc scan;
    ScanKeyData key[1];
    HeapTuple   atttup;

    /* Grab an appropriate lock on the pg_attribute relation */
    attrel = table_open(AttributeRelationId, RowExclusiveLock);

    /* Use the index to scan only attributes of the target relation */
    ScanKeyInit(&key[0],
                Anum_pg_attribute_attrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));

    scan = systable_beginscan(attrel, AttributeRelidNumIndexId, true,
                              NULL, 1, key);

    /* Delete all the matching tuples */
    while ((atttup = systable_getnext(scan)) != NULL)
        CatalogTupleDelete(attrel, &atttup->t_self);

    /* Clean up after the scan */
    systable_endscan(scan);
    table_close(attrel, RowExclusiveLock);
}

DeleteRelationTuple()

void DeleteRelationTuple

(

Oid

relid

)

Definition at line 1554 of file heap.c.

References CatalogTupleDelete(), elog, ERROR, HeapTupleIsValid, ObjectIdGetDatum, ReleaseSysCache(), RELOID, RowExclusiveLock, SearchSysCache1(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by heap_drop_with_catalog(), and index_drop().

{
    Relation    pg_class_desc;
    HeapTuple   tup;

    /* Grab an appropriate lock on the pg_class relation */
    pg_class_desc = table_open(RelationRelationId, RowExclusiveLock);

    tup = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
    if (!HeapTupleIsValid(tup))
        elog(ERROR, "cache lookup failed for relation %u", relid);

    /* delete the relation tuple from pg_class, and finish up */
    CatalogTupleDelete(pg_class_desc, &tup->t_self);

    ReleaseSysCache(tup);

    table_close(pg_class_desc, RowExclusiveLock);
}

DeleteSystemAttributeTuples()

void DeleteSystemAttributeTuples

(

Oid

relid

)

Definition at line 1620 of file heap.c.

References BTEqualStrategyNumber, BTLessEqualStrategyNumber, CatalogTupleDelete(), Int16GetDatum, sort-test::key, ObjectIdGetDatum, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by DefineQueryRewrite().

{
    Relation    attrel;
    SysScanDesc scan;
    ScanKeyData key[2];
    HeapTuple   atttup;

    /* Grab an appropriate lock on the pg_attribute relation */
    attrel = table_open(AttributeRelationId, RowExclusiveLock);

    /* Use the index to scan only system attributes of the target relation */
    ScanKeyInit(&key[0],
                Anum_pg_attribute_attrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));
    ScanKeyInit(&key[1],
                Anum_pg_attribute_attnum,
                BTLessEqualStrategyNumber, F_INT2LE,
                Int16GetDatum(0));

    scan = systable_beginscan(attrel, AttributeRelidNumIndexId, true,
                              NULL, 2, key);

    /* Delete all the matching tuples */
    while ((atttup = systable_getnext(scan)) != NULL)
        CatalogTupleDelete(attrel, &atttup->t_self);

    /* Clean up after the scan */
    systable_endscan(scan);
    table_close(attrel, RowExclusiveLock);
}

heap_create()

Relation heap_create	(	const char *	relname,
		Oid	relnamespace,
		Oid	reltablespace,
		Oid	relid,
		Oid	relfilenode,
		Oid	accessmtd,
		TupleDesc	tupDesc,
		char	relkind,
		char	relpersistence,
		bool	shared_relation,
		bool	mapped_relation,
		bool	allow_system_table_mods,
		TransactionId *	relfrozenxid,
		MultiXactId *	relminmxid
	)

Definition at line 296 of file heap.c.

References Assert, ereport, errcode(), errdetail(), errmsg(), ERROR, get_namespace_name(), InvalidMultiXactId, InvalidOid, InvalidTransactionId, IsCatalogNamespace(), IsNormalProcessingMode, IsToastNamespace(), MyDatabaseTableSpace, OidIsValid, RelationData::rd_node, RelationData::rd_rel, recordDependencyOnTablespace(), RelationBuildLocalRelation(), RelationCreateStorage(), and table_relation_set_new_filenode().

Referenced by heap_create_with_catalog(), and index_create().

{
    bool        create_storage;
    Relation    rel;

    /* The caller must have provided an OID for the relation. */
    Assert(OidIsValid(relid));

    /*
     * Don't allow creating relations in pg_catalog directly, even though it
     * is allowed to move user defined relations there. Semantics with search
     * paths including pg_catalog are too confusing for now.
     *
     * But allow creating indexes on relations in pg_catalog even if
     * allow_system_table_mods = off, upper layers already guarantee it's on a
     * user defined relation, not a system one.
     */
    if (!allow_system_table_mods &&
        ((IsCatalogNamespace(relnamespace) && relkind != RELKIND_INDEX) ||
         IsToastNamespace(relnamespace)) &&
        IsNormalProcessingMode())
        ereport(ERROR,
                (errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
                 errmsg("permission denied to create \"%s.%s\"",
                        get_namespace_name(relnamespace), relname),
                 errdetail("System catalog modifications are currently disallowed.")));

    *relfrozenxid = InvalidTransactionId;
    *relminmxid = InvalidMultiXactId;

    /* Handle reltablespace for specific relkinds. */
    switch (relkind)
    {
        case RELKIND_VIEW:
        case RELKIND_COMPOSITE_TYPE:
        case RELKIND_FOREIGN_TABLE:

            /*
             * Force reltablespace to zero if the relation has no physical
             * storage.  This is mainly just for cleanliness' sake.
             *
             * Partitioned tables and indexes don't have physical storage
             * either, but we want to keep their tablespace settings so that
             * their children can inherit it.
             */
            reltablespace = InvalidOid;
            break;

        case RELKIND_SEQUENCE:

            /*
             * Force reltablespace to zero for sequences, since we don't
             * support moving them around into different tablespaces.
             */
            reltablespace = InvalidOid;
            break;
        default:
            break;
    }

    /*
     * Decide whether to create storage. If caller passed a valid relfilenode,
     * storage is already created, so don't do it here.  Also don't create it
     * for relkinds without physical storage.
     */
    if (!RELKIND_HAS_STORAGE(relkind) || OidIsValid(relfilenode))
        create_storage = false;
    else
    {
        create_storage = true;
        relfilenode = relid;
    }

    /*
     * Never allow a pg_class entry to explicitly specify the database's
     * default tablespace in reltablespace; force it to zero instead. This
     * ensures that if the database is cloned with a different default
     * tablespace, the pg_class entry will still match where CREATE DATABASE
     * will put the physically copied relation.
     *
     * Yes, this is a bit of a hack.
     */
    if (reltablespace == MyDatabaseTableSpace)
        reltablespace = InvalidOid;

    /*
     * build the relcache entry.
     */
    rel = RelationBuildLocalRelation(relname,
                                     relnamespace,
                                     tupDesc,
                                     relid,
                                     accessmtd,
                                     relfilenode,
                                     reltablespace,
                                     shared_relation,
                                     mapped_relation,
                                     relpersistence,
                                     relkind);

    /*
     * Have the storage manager create the relation's disk file, if needed.
     *
     * For relations the callback creates both the main and the init fork, for
     * indexes only the main fork is created. The other forks will be created
     * on demand.
     */
    if (create_storage)
    {
        switch (rel->rd_rel->relkind)
        {
            case RELKIND_VIEW:
            case RELKIND_COMPOSITE_TYPE:
            case RELKIND_FOREIGN_TABLE:
            case RELKIND_PARTITIONED_TABLE:
            case RELKIND_PARTITIONED_INDEX:
                Assert(false);
                break;

            case RELKIND_INDEX:
            case RELKIND_SEQUENCE:
                RelationCreateStorage(rel->rd_node, relpersistence);
                break;

            case RELKIND_RELATION:
            case RELKIND_TOASTVALUE:
            case RELKIND_MATVIEW:
                table_relation_set_new_filenode(rel, &rel->rd_node,
                                                relpersistence,
                                                relfrozenxid, relminmxid);
                break;
        }
    }

    /*
     * If a tablespace is specified, removal of that tablespace is normally
     * protected by the existence of a physical file; but for relations with
     * no files, add a pg_shdepend entry to account for that.
     */
    if (!create_storage && reltablespace != InvalidOid)
        recordDependencyOnTablespace(RelationRelationId, relid,
                                     reltablespace);

    return rel;
}

heap_create_with_catalog()

Oid heap_create_with_catalog	(	const char *	relname,
		Oid	relnamespace,
		Oid	reltablespace,
		Oid	relid,
		Oid	reltypeid,
		Oid	reloftypeid,
		Oid	ownerid,
		Oid	accessmtd,
		TupleDesc	tupdesc,
		List *	cooked_constraints,
		char	relkind,
		char	relpersistence,
		bool	shared_relation,
		bool	mapped_relation,
		OnCommitAction	oncommit,
		Datum	reloptions,
		bool	use_user_acl,
		bool	allow_system_table_mods,
		bool	is_internal,
		Oid	relrewrite,
		ObjectAddress *	typaddress
	)

Definition at line 1143 of file heap.c.

References add_exact_object_address(), AddNewAttributeTuples(), AddNewRelationTuple(), AddNewRelationType(), Assert, AssignTypeArrayOid(), binary_upgrade_next_heap_pg_class_oid, binary_upgrade_next_toast_pg_class_oid, CheckAttributeNamesTypes(), CHKATYPE_ANYARRAY, CStringGetDatum, DEFAULT_TYPDELIM, DEPENDENCY_NORMAL, elog, ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errhint(), errmsg(), ERROR, free_object_addresses(), get_relname_relid(), get_user_default_acl(), GetNewRelFileNode(), GetSysCacheOid2, heap_create(), InvalidOid, InvokeObjectPostCreateHookArg, IsBinaryUpgrade, IsBootstrapProcessingMode, IsNormalProcessingMode, makeArrayTypeName(), moveArrayTypeName(), new_object_addresses(), NoLock, OBJECT_SEQUENCE, OBJECT_TABLE, ObjectAddressSet, ObjectAddress::objectId, ObjectIdGetDatum, OidIsValid, ONCOMMIT_NOOP, pfree(), PointerGetDatum, RelationData::rd_att, RelationData::rd_rel, record_object_address_dependencies(), recordDependencyOnCurrentExtension(), recordDependencyOnNewAcl(), recordDependencyOnOwner(), register_on_commit_action(), RelationGetRelid, RowExclusiveLock, StoreConstraints(), table_close(), table_open(), TypeCreate(), and TYPENAMENSP.

Referenced by create_toast_table(), DefineRelation(), and make_new_heap().

{
    Relation    pg_class_desc;
    Relation    new_rel_desc;
    Acl        *relacl;
    Oid         existing_relid;
    Oid         old_type_oid;
    Oid         new_type_oid;
    TransactionId relfrozenxid;
    MultiXactId relminmxid;

    pg_class_desc = table_open(RelationRelationId, RowExclusiveLock);

    /*
     * sanity checks
     */
    Assert(IsNormalProcessingMode() || IsBootstrapProcessingMode());

    /*
     * Validate proposed tupdesc for the desired relkind.  If
     * allow_system_table_mods is on, allow ANYARRAY to be used; this is a
     * hack to allow creating pg_statistic and cloning it during VACUUM FULL.
     */
    CheckAttributeNamesTypes(tupdesc, relkind,
                             allow_system_table_mods ? CHKATYPE_ANYARRAY : 0);

    /*
     * This would fail later on anyway, if the relation already exists.  But
     * by catching it here we can emit a nicer error message.
     */
    existing_relid = get_relname_relid(relname, relnamespace);
    if (existing_relid != InvalidOid)
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_TABLE),
                 errmsg("relation \"%s\" already exists", relname)));

    /*
     * Since we are going to create a rowtype as well, also check for
     * collision with an existing type name.  If there is one and it's an
     * autogenerated array, we can rename it out of the way; otherwise we can
     * at least give a good error message.
     */
    old_type_oid = GetSysCacheOid2(TYPENAMENSP, Anum_pg_type_oid,
                                   CStringGetDatum(relname),
                                   ObjectIdGetDatum(relnamespace));
    if (OidIsValid(old_type_oid))
    {
        if (!moveArrayTypeName(old_type_oid, relname, relnamespace))
            ereport(ERROR,
                    (errcode(ERRCODE_DUPLICATE_OBJECT),
                     errmsg("type \"%s\" already exists", relname),
                     errhint("A relation has an associated type of the same name, "
                             "so you must use a name that doesn't conflict "
                             "with any existing type.")));
    }

    /*
     * Shared relations must be in pg_global (last-ditch check)
     */
    if (shared_relation && reltablespace != GLOBALTABLESPACE_OID)
        elog(ERROR, "shared relations must be placed in pg_global tablespace");

    /*
     * Allocate an OID for the relation, unless we were told what to use.
     *
     * The OID will be the relfilenode as well, so make sure it doesn't
     * collide with either pg_class OIDs or existing physical files.
     */
    if (!OidIsValid(relid))
    {
        /* Use binary-upgrade override for pg_class.oid/relfilenode? */
        if (IsBinaryUpgrade &&
            (relkind == RELKIND_RELATION || relkind == RELKIND_SEQUENCE ||
             relkind == RELKIND_VIEW || relkind == RELKIND_MATVIEW ||
             relkind == RELKIND_COMPOSITE_TYPE || relkind == RELKIND_FOREIGN_TABLE ||
             relkind == RELKIND_PARTITIONED_TABLE))
        {
            if (!OidIsValid(binary_upgrade_next_heap_pg_class_oid))
                ereport(ERROR,
                        (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                         errmsg("pg_class heap OID value not set when in binary upgrade mode")));

            relid = binary_upgrade_next_heap_pg_class_oid;
            binary_upgrade_next_heap_pg_class_oid = InvalidOid;
        }
        /* There might be no TOAST table, so we have to test for it. */
        else if (IsBinaryUpgrade &&
                 OidIsValid(binary_upgrade_next_toast_pg_class_oid) &&
                 relkind == RELKIND_TOASTVALUE)
        {
            relid = binary_upgrade_next_toast_pg_class_oid;
            binary_upgrade_next_toast_pg_class_oid = InvalidOid;
        }
        else
            relid = GetNewRelFileNode(reltablespace, pg_class_desc,
                                      relpersistence);
    }

    /*
     * Determine the relation's initial permissions.
     */
    if (use_user_acl)
    {
        switch (relkind)
        {
            case RELKIND_RELATION:
            case RELKIND_VIEW:
            case RELKIND_MATVIEW:
            case RELKIND_FOREIGN_TABLE:
            case RELKIND_PARTITIONED_TABLE:
                relacl = get_user_default_acl(OBJECT_TABLE, ownerid,
                                              relnamespace);
                break;
            case RELKIND_SEQUENCE:
                relacl = get_user_default_acl(OBJECT_SEQUENCE, ownerid,
                                              relnamespace);
                break;
            default:
                relacl = NULL;
                break;
        }
    }
    else
        relacl = NULL;

    /*
     * Create the relcache entry (mostly dummy at this point) and the physical
     * disk file.  (If we fail further down, it's the smgr's responsibility to
     * remove the disk file again.)
     */
    new_rel_desc = heap_create(relname,
                               relnamespace,
                               reltablespace,
                               relid,
                               InvalidOid,
                               accessmtd,
                               tupdesc,
                               relkind,
                               relpersistence,
                               shared_relation,
                               mapped_relation,
                               allow_system_table_mods,
                               &relfrozenxid,
                               &relminmxid);

    Assert(relid == RelationGetRelid(new_rel_desc));

    new_rel_desc->rd_rel->relrewrite = relrewrite;

    /*
     * Decide whether to create a pg_type entry for the relation's rowtype.
     * These types are made except where the use of a relation as such is an
     * implementation detail: toast tables, sequences and indexes.
     */
    if (!(relkind == RELKIND_SEQUENCE ||
          relkind == RELKIND_TOASTVALUE ||
          relkind == RELKIND_INDEX ||
          relkind == RELKIND_PARTITIONED_INDEX))
    {
        Oid         new_array_oid;
        ObjectAddress new_type_addr;
        char       *relarrayname;

        /*
         * We'll make an array over the composite type, too.  For largely
         * historical reasons, the array type's OID is assigned first.
         */
        new_array_oid = AssignTypeArrayOid();

        /*
         * Make the pg_type entry for the composite type.  The OID of the
         * composite type can be preselected by the caller, but if reltypeid
         * is InvalidOid, we'll generate a new OID for it.
         *
         * NOTE: we could get a unique-index failure here, in case someone
         * else is creating the same type name in parallel but hadn't
         * committed yet when we checked for a duplicate name above.
         */
        new_type_addr = AddNewRelationType(relname,
                                           relnamespace,
                                           relid,
                                           relkind,
                                           ownerid,
                                           reltypeid,
                                           new_array_oid);
        new_type_oid = new_type_addr.objectId;
        if (typaddress)
            *typaddress = new_type_addr;

        /* Now create the array type. */
        relarrayname = makeArrayTypeName(relname, relnamespace);

        TypeCreate(new_array_oid,   /* force the type's OID to this */
                   relarrayname,    /* Array type name */
                   relnamespace,    /* Same namespace as parent */
                   InvalidOid,  /* Not composite, no relationOid */
                   0,           /* relkind, also N/A here */
                   ownerid,     /* owner's ID */
                   -1,          /* Internal size (varlena) */
                   TYPTYPE_BASE,    /* Not composite - typelem is */
                   TYPCATEGORY_ARRAY,   /* type-category (array) */
                   false,       /* array types are never preferred */
                   DEFAULT_TYPDELIM,    /* default array delimiter */
                   F_ARRAY_IN,  /* array input proc */
                   F_ARRAY_OUT, /* array output proc */
                   F_ARRAY_RECV,    /* array recv (bin) proc */
                   F_ARRAY_SEND,    /* array send (bin) proc */
                   InvalidOid,  /* typmodin procedure - none */
                   InvalidOid,  /* typmodout procedure - none */
                   F_ARRAY_TYPANALYZE,  /* array analyze procedure */
                   F_ARRAY_SUBSCRIPT_HANDLER,   /* array subscript procedure */
                   new_type_oid,    /* array element type - the rowtype */
                   true,        /* yes, this is an array type */
                   InvalidOid,  /* this has no array type */
                   InvalidOid,  /* domain base type - irrelevant */
                   NULL,        /* default value - none */
                   NULL,        /* default binary representation */
                   false,       /* passed by reference */
                   TYPALIGN_DOUBLE, /* alignment - must be the largest! */
                   TYPSTORAGE_EXTENDED, /* fully TOASTable */
                   -1,          /* typmod */
                   0,           /* array dimensions for typBaseType */
                   false,       /* Type NOT NULL */
                   InvalidOid); /* rowtypes never have a collation */

        pfree(relarrayname);
    }
    else
    {
        /* Caller should not be expecting a type to be created. */
        Assert(reltypeid == InvalidOid);
        Assert(typaddress == NULL);

        new_type_oid = InvalidOid;
    }

    /*
     * now create an entry in pg_class for the relation.
     *
     * NOTE: we could get a unique-index failure here, in case someone else is
     * creating the same relation name in parallel but hadn't committed yet
     * when we checked for a duplicate name above.
     */
    AddNewRelationTuple(pg_class_desc,
                        new_rel_desc,
                        relid,
                        new_type_oid,
                        reloftypeid,
                        ownerid,
                        relkind,
                        relfrozenxid,
                        relminmxid,
                        PointerGetDatum(relacl),
                        reloptions);

    /*
     * now add tuples to pg_attribute for the attributes in our new relation.
     */
    AddNewAttributeTuples(relid, new_rel_desc->rd_att, relkind);

    /*
     * Make a dependency link to force the relation to be deleted if its
     * namespace is.  Also make a dependency link to its owner, as well as
     * dependencies for any roles mentioned in the default ACL.
     *
     * For composite types, these dependencies are tracked for the pg_type
     * entry, so we needn't record them here.  Likewise, TOAST tables don't
     * need a namespace dependency (they live in a pinned namespace) nor an
     * owner dependency (they depend indirectly through the parent table), nor
     * should they have any ACL entries.  The same applies for extension
     * dependencies.
     *
     * Also, skip this in bootstrap mode, since we don't make dependencies
     * while bootstrapping.
     */
    if (relkind != RELKIND_COMPOSITE_TYPE &&
        relkind != RELKIND_TOASTVALUE &&
        !IsBootstrapProcessingMode())
    {
        ObjectAddress myself,
                    referenced;
        ObjectAddresses *addrs;

        ObjectAddressSet(myself, RelationRelationId, relid);

        recordDependencyOnOwner(RelationRelationId, relid, ownerid);

        recordDependencyOnNewAcl(RelationRelationId, relid, 0, ownerid, relacl);

        recordDependencyOnCurrentExtension(&myself, false);

        addrs = new_object_addresses();

        ObjectAddressSet(referenced, NamespaceRelationId, relnamespace);
        add_exact_object_address(&referenced, addrs);

        if (reloftypeid)
        {
            ObjectAddressSet(referenced, TypeRelationId, reloftypeid);
            add_exact_object_address(&referenced, addrs);
        }

        /*
         * Make a dependency link to force the relation to be deleted if its
         * access method is. Do this only for relation and materialized views.
         *
         * No need to add an explicit dependency for the toast table, as the
         * main table depends on it.
         */
        if (relkind == RELKIND_RELATION ||
            relkind == RELKIND_MATVIEW)
        {
            ObjectAddressSet(referenced, AccessMethodRelationId, accessmtd);
            add_exact_object_address(&referenced, addrs);
        }

        record_object_address_dependencies(&myself, addrs, DEPENDENCY_NORMAL);
        free_object_addresses(addrs);
    }

    /* Post creation hook for new relation */
    InvokeObjectPostCreateHookArg(RelationRelationId, relid, 0, is_internal);

    /*
     * Store any supplied constraints and defaults.
     *
     * NB: this may do a CommandCounterIncrement and rebuild the relcache
     * entry, so the relation must be valid and self-consistent at this point.
     * In particular, there are not yet constraints and defaults anywhere.
     */
    StoreConstraints(new_rel_desc, cooked_constraints, is_internal);

    /*
     * If there's a special on-commit action, remember it
     */
    if (oncommit != ONCOMMIT_NOOP)
        register_on_commit_action(relid, oncommit);

    /*
     * ok, the relation has been cataloged, so close our relations and return
     * the OID of the newly created relation.
     */
    table_close(new_rel_desc, NoLock);  /* do not unlock till end of xact */
    table_close(pg_class_desc, RowExclusiveLock);

    return relid;
}

heap_drop_with_catalog()

void heap_drop_with_catalog

(

Oid

relid

)

Definition at line 1902 of file heap.c.

References AccessExclusiveLock, CacheInvalidateRelcacheByRelid(), CatalogTupleDelete(), CheckTableForSerializableConflictIn(), CheckTableNotInUse(), DeleteAttributeTuples(), DeleteRelationTuple(), elog, ERROR, FOREIGNTABLEREL, get_default_partition_oid(), get_partition_parent(), GETSTRUCT, HeapTupleIsValid, InvalidOid, LockRelationOid(), NoLock, ObjectIdGetDatum, OidIsValid, RelationData::rd_rel, relation_close(), relation_open(), RelationDropStorage(), RelationForgetRelation(), RelationRemoveInheritance(), ReleaseSysCache(), RELOID, remove_on_commit_action(), RemovePartitionKeyByRelId(), RemoveStatistics(), RemoveSubscriptionRel(), RowExclusiveLock, SearchSysCache1(), HeapTupleData::t_self, table_close(), table_open(), and update_default_partition_oid().

Referenced by doDeletion().

{
    Relation    rel;
    HeapTuple   tuple;
    Oid         parentOid = InvalidOid,
                defaultPartOid = InvalidOid;

    /*
     * To drop a partition safely, we must grab exclusive lock on its parent,
     * because another backend might be about to execute a query on the parent
     * table.  If it relies on previously cached partition descriptor, then it
     * could attempt to access the just-dropped relation as its partition. We
     * must therefore take a table lock strong enough to prevent all queries
     * on the table from proceeding until we commit and send out a
     * shared-cache-inval notice that will make them update their partition
     * descriptors.
     */
    tuple = SearchSysCache1(RELOID, ObjectIdGetDatum(relid));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for relation %u", relid);
    if (((Form_pg_class) GETSTRUCT(tuple))->relispartition)
    {
        /*
         * We have to lock the parent if the partition is being detached,
         * because it's possible that some query still has a partition
         * descriptor that includes this partition.
         */
        parentOid = get_partition_parent(relid, true);
        LockRelationOid(parentOid, AccessExclusiveLock);

        /*
         * If this is not the default partition, dropping it will change the
         * default partition's partition constraint, so we must lock it.
         */
        defaultPartOid = get_default_partition_oid(parentOid);
        if (OidIsValid(defaultPartOid) && relid != defaultPartOid)
            LockRelationOid(defaultPartOid, AccessExclusiveLock);
    }

    ReleaseSysCache(tuple);

    /*
     * Open and lock the relation.
     */
    rel = relation_open(relid, AccessExclusiveLock);

    /*
     * There can no longer be anyone *else* touching the relation, but we
     * might still have open queries or cursors, or pending trigger events, in
     * our own session.
     */
    CheckTableNotInUse(rel, "DROP TABLE");

    /*
     * This effectively deletes all rows in the table, and may be done in a
     * serializable transaction.  In that case we must record a rw-conflict in
     * to this transaction from each transaction holding a predicate lock on
     * the table.
     */
    CheckTableForSerializableConflictIn(rel);

    /*
     * Delete pg_foreign_table tuple first.
     */
    if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
    {
        Relation    rel;
        HeapTuple   tuple;

        rel = table_open(ForeignTableRelationId, RowExclusiveLock);

        tuple = SearchSysCache1(FOREIGNTABLEREL, ObjectIdGetDatum(relid));
        if (!HeapTupleIsValid(tuple))
            elog(ERROR, "cache lookup failed for foreign table %u", relid);

        CatalogTupleDelete(rel, &tuple->t_self);

        ReleaseSysCache(tuple);
        table_close(rel, RowExclusiveLock);
    }

    /*
     * If a partitioned table, delete the pg_partitioned_table tuple.
     */
    if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        RemovePartitionKeyByRelId(relid);

    /*
     * If the relation being dropped is the default partition itself,
     * invalidate its entry in pg_partitioned_table.
     */
    if (relid == defaultPartOid)
        update_default_partition_oid(parentOid, InvalidOid);

    /*
     * Schedule unlinking of the relation's physical files at commit.
     */
    if (RELKIND_HAS_STORAGE(rel->rd_rel->relkind))
        RelationDropStorage(rel);

    /*
     * Close relcache entry, but *keep* AccessExclusiveLock on the relation
     * until transaction commit.  This ensures no one else will try to do
     * something with the doomed relation.
     */
    relation_close(rel, NoLock);

    /*
     * Remove any associated relation synchronization states.
     */
    RemoveSubscriptionRel(InvalidOid, relid);

    /*
     * Forget any ON COMMIT action for the rel
     */
    remove_on_commit_action(relid);

    /*
     * Flush the relation from the relcache.  We want to do this before
     * starting to remove catalog entries, just to be certain that no relcache
     * entry rebuild will happen partway through.  (That should not really
     * matter, since we don't do CommandCounterIncrement here, but let's be
     * safe.)
     */
    RelationForgetRelation(relid);

    /*
     * remove inheritance information
     */
    RelationRemoveInheritance(relid);

    /*
     * delete statistics
     */
    RemoveStatistics(relid, 0);

    /*
     * delete attribute tuples
     */
    DeleteAttributeTuples(relid);

    /*
     * delete relation tuple
     */
    DeleteRelationTuple(relid);

    if (OidIsValid(parentOid))
    {
        /*
         * If this is not the default partition, the partition constraint of
         * the default partition has changed to include the portion of the key
         * space previously covered by the dropped partition.
         */
        if (OidIsValid(defaultPartOid) && relid != defaultPartOid)
            CacheInvalidateRelcacheByRelid(defaultPartOid);

        /*
         * Invalidate the parent's relcache so that the partition is no longer
         * included in its partition descriptor.
         */
        CacheInvalidateRelcacheByRelid(parentOid);
        /* keep the lock */
    }
}

heap_truncate()

void heap_truncate

(

List *

relids

)

Definition at line 3328 of file heap.c.

References AccessExclusiveLock, heap_truncate_check_FKs(), heap_truncate_one_rel(), lappend(), lfirst, lfirst_oid, NIL, NoLock, table_close(), and table_open().

Referenced by PreCommit_on_commit_actions().

{
    List       *relations = NIL;
    ListCell   *cell;

    /* Open relations for processing, and grab exclusive access on each */
    foreach(cell, relids)
    {
        Oid         rid = lfirst_oid(cell);
        Relation    rel;

        rel = table_open(rid, AccessExclusiveLock);
        relations = lappend(relations, rel);
    }

    /* Don't allow truncate on tables that are referenced by foreign keys */
    heap_truncate_check_FKs(relations, true);

    /* OK to do it */
    foreach(cell, relations)
    {
        Relation    rel = lfirst(cell);

        /* Truncate the relation */
        heap_truncate_one_rel(rel);

        /* Close the relation, but keep exclusive lock on it until commit */
        table_close(rel, NoLock);
    }
}

heap_truncate_check_FKs()

void heap_truncate_check_FKs	(	List *	relations,
		bool	tempTables
	)

Definition at line 3413 of file heap.c.

References ereport, errcode(), errdetail(), errhint(), errmsg(), ERROR, get_rel_name(), heap_truncate_find_FKs(), lappend_oid(), lfirst, lfirst_oid, list_make1_oid, list_member_oid(), NIL, RelationData::rd_rel, RelationGetRelid, and relname.

Referenced by ExecuteTruncateGuts(), and heap_truncate().

{
    List       *oids = NIL;
    List       *dependents;
    ListCell   *cell;

    /*
     * Build a list of OIDs of the interesting relations.
     *
     * If a relation has no triggers, then it can neither have FKs nor be
     * referenced by a FK from another table, so we can ignore it.  For
     * partitioned tables, FKs have no triggers, so we must include them
     * anyway.
     */
    foreach(cell, relations)
    {
        Relation    rel = lfirst(cell);

        if (rel->rd_rel->relhastriggers ||
            rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
            oids = lappend_oid(oids, RelationGetRelid(rel));
    }

    /*
     * Fast path: if no relation has triggers, none has FKs either.
     */
    if (oids == NIL)
        return;

    /*
     * Otherwise, must scan pg_constraint.  We make one pass with all the
     * relations considered; if this finds nothing, then all is well.
     */
    dependents = heap_truncate_find_FKs(oids);
    if (dependents == NIL)
        return;

    /*
     * Otherwise we repeat the scan once per relation to identify a particular
     * pair of relations to complain about.  This is pretty slow, but
     * performance shouldn't matter much in a failure path.  The reason for
     * doing things this way is to ensure that the message produced is not
     * dependent on chance row locations within pg_constraint.
     */
    foreach(cell, oids)
    {
        Oid         relid = lfirst_oid(cell);
        ListCell   *cell2;

        dependents = heap_truncate_find_FKs(list_make1_oid(relid));

        foreach(cell2, dependents)
        {
            Oid         relid2 = lfirst_oid(cell2);

            if (!list_member_oid(oids, relid2))
            {
                char       *relname = get_rel_name(relid);
                char       *relname2 = get_rel_name(relid2);

                if (tempTables)
                    ereport(ERROR,
                            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                             errmsg("unsupported ON COMMIT and foreign key combination"),
                             errdetail("Table \"%s\" references \"%s\", but they do not have the same ON COMMIT setting.",
                                       relname2, relname)));
                else
                    ereport(ERROR,
                            (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
                             errmsg("cannot truncate a table referenced in a foreign key constraint"),
                             errdetail("Table \"%s\" references \"%s\".",
                                       relname2, relname),
                             errhint("Truncate table \"%s\" at the same time, "
                                     "or use TRUNCATE ... CASCADE.",
                                     relname2)));
            }
        }
    }
}

heap_truncate_find_FKs()

List* heap_truncate_find_FKs

(

List *

relationIds

)

Definition at line 3508 of file heap.c.

References AccessShareLock, BTEqualStrategyNumber, GETSTRUCT, HeapTupleIsValid, InvalidOid, sort-test::key, lappend_oid(), lfirst_oid, list_append_unique_oid(), list_copy(), list_deduplicate_oid(), list_free(), list_member_oid(), list_oid_cmp(), list_sort(), NIL, ObjectIdGetDatum, OidIsValid, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by ExecuteTruncateGuts(), and heap_truncate_check_FKs().

{
    List       *result = NIL;
    List       *oids;
    List       *parent_cons;
    ListCell   *cell;
    ScanKeyData key;
    Relation    fkeyRel;
    SysScanDesc fkeyScan;
    HeapTuple   tuple;
    bool        restart;

    oids = list_copy(relationIds);

    /*
     * Must scan pg_constraint.  Right now, it is a seqscan because there is
     * no available index on confrelid.
     */
    fkeyRel = table_open(ConstraintRelationId, AccessShareLock);

restart:
    restart = false;
    parent_cons = NIL;

    fkeyScan = systable_beginscan(fkeyRel, InvalidOid, false,
                                  NULL, 0, NULL);

    while (HeapTupleIsValid(tuple = systable_getnext(fkeyScan)))
    {
        Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);

        /* Not a foreign key */
        if (con->contype != CONSTRAINT_FOREIGN)
            continue;

        /* Not referencing one of our list of tables */
        if (!list_member_oid(oids, con->confrelid))
            continue;

        /*
         * If this constraint has a parent constraint which we have not seen
         * yet, keep track of it for the second loop, below.  Tracking parent
         * constraints allows us to climb up to the top-level constraint
         * and look for all possible relations referencing the partitioned
         * table.
         */
        if (OidIsValid(con->conparentid) &&
            !list_member_oid(parent_cons, con->conparentid))
            parent_cons = lappend_oid(parent_cons, con->conparentid);

        /*
         * Add referencer to result, unless present in input list.  (Don't
         * worry about dupes: we'll fix that below).
         */
        if (!list_member_oid(relationIds, con->conrelid))
            result = lappend_oid(result, con->conrelid);
    }

    systable_endscan(fkeyScan);

    /*
     * Process each parent constraint we found to add the list of referenced
     * relations by them to the oids list.  If we do add any new such
     * relations, redo the first loop above.  Also, if we see that the parent
     * constraint in turn has a parent, add that so that we process all
     * relations in a single additional pass.
     */
    foreach(cell, parent_cons)
    {
        Oid         parent = lfirst_oid(cell);

        ScanKeyInit(&key,
                    Anum_pg_constraint_oid,
                    BTEqualStrategyNumber, F_OIDEQ,
                    ObjectIdGetDatum(parent));

        fkeyScan = systable_beginscan(fkeyRel, ConstraintOidIndexId,
                                      true, NULL, 1, &key);

        tuple = systable_getnext(fkeyScan);
        if (HeapTupleIsValid(tuple))
        {
            Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tuple);

            /*
             * pg_constraint rows always appear for partitioned hierarchies
             * this way: on the each side of the constraint, one row appears
             * for each partition that points to the top-most table on the
             * other side.
             *
             * Because of this arrangement, we can correctly catch all
             * relevant relations by adding to 'parent_cons' all rows with
             * valid conparentid, and to the 'oids' list all rows with a zero
             * conparentid.  If any oids are added to 'oids', redo the first
             * loop above by setting 'restart'.
             */
            if (OidIsValid(con->conparentid))
                parent_cons = list_append_unique_oid(parent_cons,
                                                     con->conparentid);
            else if (!list_member_oid(oids, con->confrelid))
            {
                oids = lappend_oid(oids, con->confrelid);
                restart = true;
            }
        }

        systable_endscan(fkeyScan);
    }

    list_free(parent_cons);
    if (restart)
        goto restart;

    table_close(fkeyRel, AccessShareLock);
    list_free(oids);

    /* Now sort and de-duplicate the result list */
    list_sort(result, list_oid_cmp);
    list_deduplicate_oid(result);

    return result;
}

heap_truncate_one_rel()

void heap_truncate_one_rel

(

Relation

rel

)

Definition at line 3369 of file heap.c.

References AccessExclusiveLock, NoLock, OidIsValid, RelationData::rd_rel, RelationTruncateIndexes(), table_close(), table_open(), and table_relation_nontransactional_truncate().

Referenced by ExecuteTruncateGuts(), and heap_truncate().

{
    Oid         toastrelid;

    /*
     * Truncate the relation.  Partitioned tables have no storage, so there is
     * nothing to do for them here.
     */
    if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        return;

    /* Truncate the underlying relation */
    table_relation_nontransactional_truncate(rel);

    /* If the relation has indexes, truncate the indexes too */
    RelationTruncateIndexes(rel);

    /* If there is a toast table, truncate that too */
    toastrelid = rel->rd_rel->reltoastrelid;
    if (OidIsValid(toastrelid))
    {
        Relation    toastrel = table_open(toastrelid, AccessExclusiveLock);

        table_relation_nontransactional_truncate(toastrel);
        RelationTruncateIndexes(toastrel);
        /* keep the lock... */
        table_close(toastrel, NoLock);
    }
}

InsertPgAttributeTuples()

void InsertPgAttributeTuples	(	Relation	pg_attribute_rel,
		TupleDesc	tupdesc,
		Oid	new_rel_oid,
		Datum *	attoptions,
		CatalogIndexState	indstate
	)

Definition at line 739 of file heap.c.

References BoolGetDatum, CatalogCloseIndexes(), CatalogOpenIndexes(), CatalogTuplesMultiInsertWithInfo(), CharGetDatum, ExecClearTuple(), ExecDropSingleTupleTableSlot(), ExecStoreVirtualTuple(), FormData_pg_attribute, i, Int16GetDatum, Int32GetDatum, InvalidOid, MakeSingleTupleTableSlot(), MAX_CATALOG_MULTI_INSERT_BYTES, Min, NameGetDatum, TupleDescData::natts, ObjectIdGetDatum, palloc(), pfree(), RelationGetDescr, TupleTableSlot::tts_isnull, TupleTableSlot::tts_values, TTSOpsHeapTuple, and TupleDescAttr.

Referenced by AddNewAttributeTuples(), AppendAttributeTuples(), and ATExecAddColumn().

{
    TupleTableSlot **slot;
    TupleDesc   td;
    int         nslots;
    int         natts = 0;
    int         slotCount = 0;
    bool        close_index = false;

    td = RelationGetDescr(pg_attribute_rel);

    /* Initialize the number of slots to use */
    nslots = Min(tupdesc->natts,
                 (MAX_CATALOG_MULTI_INSERT_BYTES / sizeof(FormData_pg_attribute)));
    slot = palloc(sizeof(TupleTableSlot *) * nslots);
    for (int i = 0; i < nslots; i++)
        slot[i] = MakeSingleTupleTableSlot(td, &TTSOpsHeapTuple);

    while (natts < tupdesc->natts)
    {
        Form_pg_attribute attrs = TupleDescAttr(tupdesc, natts);

        ExecClearTuple(slot[slotCount]);

        if (new_rel_oid != InvalidOid)
            slot[slotCount]->tts_values[Anum_pg_attribute_attrelid - 1] = ObjectIdGetDatum(new_rel_oid);
        else
            slot[slotCount]->tts_values[Anum_pg_attribute_attrelid - 1] = ObjectIdGetDatum(attrs->attrelid);

        slot[slotCount]->tts_values[Anum_pg_attribute_attname - 1] = NameGetDatum(&attrs->attname);
        slot[slotCount]->tts_values[Anum_pg_attribute_atttypid - 1] = ObjectIdGetDatum(attrs->atttypid);
        slot[slotCount]->tts_values[Anum_pg_attribute_attstattarget - 1] = Int32GetDatum(attrs->attstattarget);
        slot[slotCount]->tts_values[Anum_pg_attribute_attlen - 1] = Int16GetDatum(attrs->attlen);
        slot[slotCount]->tts_values[Anum_pg_attribute_attnum - 1] = Int16GetDatum(attrs->attnum);
        slot[slotCount]->tts_values[Anum_pg_attribute_attndims - 1] = Int32GetDatum(attrs->attndims);
        slot[slotCount]->tts_values[Anum_pg_attribute_attcacheoff - 1] = Int32GetDatum(-1);
        slot[slotCount]->tts_values[Anum_pg_attribute_atttypmod - 1] = Int32GetDatum(attrs->atttypmod);
        slot[slotCount]->tts_values[Anum_pg_attribute_attbyval - 1] = BoolGetDatum(attrs->attbyval);
        slot[slotCount]->tts_values[Anum_pg_attribute_attalign - 1] = CharGetDatum(attrs->attalign);
        slot[slotCount]->tts_values[Anum_pg_attribute_attstorage - 1] = CharGetDatum(attrs->attstorage);
        slot[slotCount]->tts_values[Anum_pg_attribute_attcompression - 1] = CharGetDatum(attrs->attcompression);
        slot[slotCount]->tts_values[Anum_pg_attribute_attnotnull - 1] = BoolGetDatum(attrs->attnotnull);
        slot[slotCount]->tts_values[Anum_pg_attribute_atthasdef - 1] = BoolGetDatum(attrs->atthasdef);
        slot[slotCount]->tts_values[Anum_pg_attribute_atthasmissing - 1] = BoolGetDatum(attrs->atthasmissing);
        slot[slotCount]->tts_values[Anum_pg_attribute_attidentity - 1] = CharGetDatum(attrs->attidentity);
        slot[slotCount]->tts_values[Anum_pg_attribute_attgenerated - 1] = CharGetDatum(attrs->attgenerated);
        slot[slotCount]->tts_values[Anum_pg_attribute_attisdropped - 1] = BoolGetDatum(attrs->attisdropped);
        slot[slotCount]->tts_values[Anum_pg_attribute_attislocal - 1] = BoolGetDatum(attrs->attislocal);
        slot[slotCount]->tts_values[Anum_pg_attribute_attinhcount - 1] = Int32GetDatum(attrs->attinhcount);
        slot[slotCount]->tts_values[Anum_pg_attribute_attcollation - 1] = ObjectIdGetDatum(attrs->attcollation);
        if (attoptions && attoptions[natts] != (Datum) 0)
            slot[slotCount]->tts_values[Anum_pg_attribute_attoptions - 1] = attoptions[natts];
        else
            slot[slotCount]->tts_isnull[Anum_pg_attribute_attoptions - 1] = true;

        /* start out with empty permissions and empty options */
        slot[slotCount]->tts_isnull[Anum_pg_attribute_attacl - 1] = true;
        slot[slotCount]->tts_isnull[Anum_pg_attribute_attfdwoptions - 1] = true;
        slot[slotCount]->tts_isnull[Anum_pg_attribute_attmissingval - 1] = true;

        ExecStoreVirtualTuple(slot[slotCount]);
        slotCount++;

        /*
         * If slots are full or the end of processing has been reached, insert
         * a batch of tuples.
         */
        if (slotCount == nslots || natts == tupdesc->natts - 1)
        {
            /* fetch index info only when we know we need it */
            if (!indstate)
            {
                indstate = CatalogOpenIndexes(pg_attribute_rel);
                close_index = true;
            }

            /* insert the new tuples and update the indexes */
            CatalogTuplesMultiInsertWithInfo(pg_attribute_rel, slot, slotCount,
                                             indstate);
            slotCount = 0;
        }

        natts++;
    }

    if (close_index)
        CatalogCloseIndexes(indstate);
    for (int i = 0; i < nslots; i++)
        ExecDropSingleTupleTableSlot(slot[i]);
    pfree(slot);
}

InsertPgClassTuple()

void InsertPgClassTuple	(	Relation	pg_class_desc,
		Relation	new_rel_desc,
		Oid	new_rel_oid,
		Datum	relacl,
		Datum	reloptions
	)

Definition at line 921 of file heap.c.

References BoolGetDatum, CatalogTupleInsert(), CharGetDatum, Float4GetDatum(), heap_form_tuple(), heap_freetuple(), Int16GetDatum, Int32GetDatum, MultiXactIdGetDatum, NameGetDatum, ObjectIdGetDatum, RelationData::rd_rel, RelationGetDescr, TransactionIdGetDatum, and values.

Referenced by AddNewRelationTuple(), and index_create().

{
    Form_pg_class rd_rel = new_rel_desc->rd_rel;
    Datum       values[Natts_pg_class];
    bool        nulls[Natts_pg_class];
    HeapTuple   tup;

    /* This is a tad tedious, but way cleaner than what we used to do... */
    memset(values, 0, sizeof(values));
    memset(nulls, false, sizeof(nulls));

    values[Anum_pg_class_oid - 1] = ObjectIdGetDatum(new_rel_oid);
    values[Anum_pg_class_relname - 1] = NameGetDatum(&rd_rel->relname);
    values[Anum_pg_class_relnamespace - 1] = ObjectIdGetDatum(rd_rel->relnamespace);
    values[Anum_pg_class_reltype - 1] = ObjectIdGetDatum(rd_rel->reltype);
    values[Anum_pg_class_reloftype - 1] = ObjectIdGetDatum(rd_rel->reloftype);
    values[Anum_pg_class_relowner - 1] = ObjectIdGetDatum(rd_rel->relowner);
    values[Anum_pg_class_relam - 1] = ObjectIdGetDatum(rd_rel->relam);
    values[Anum_pg_class_relfilenode - 1] = ObjectIdGetDatum(rd_rel->relfilenode);
    values[Anum_pg_class_reltablespace - 1] = ObjectIdGetDatum(rd_rel->reltablespace);
    values[Anum_pg_class_relpages - 1] = Int32GetDatum(rd_rel->relpages);
    values[Anum_pg_class_reltuples - 1] = Float4GetDatum(rd_rel->reltuples);
    values[Anum_pg_class_relallvisible - 1] = Int32GetDatum(rd_rel->relallvisible);
    values[Anum_pg_class_reltoastrelid - 1] = ObjectIdGetDatum(rd_rel->reltoastrelid);
    values[Anum_pg_class_relhasindex - 1] = BoolGetDatum(rd_rel->relhasindex);
    values[Anum_pg_class_relisshared - 1] = BoolGetDatum(rd_rel->relisshared);
    values[Anum_pg_class_relpersistence - 1] = CharGetDatum(rd_rel->relpersistence);
    values[Anum_pg_class_relkind - 1] = CharGetDatum(rd_rel->relkind);
    values[Anum_pg_class_relnatts - 1] = Int16GetDatum(rd_rel->relnatts);
    values[Anum_pg_class_relchecks - 1] = Int16GetDatum(rd_rel->relchecks);
    values[Anum_pg_class_relhasrules - 1] = BoolGetDatum(rd_rel->relhasrules);
    values[Anum_pg_class_relhastriggers - 1] = BoolGetDatum(rd_rel->relhastriggers);
    values[Anum_pg_class_relrowsecurity - 1] = BoolGetDatum(rd_rel->relrowsecurity);
    values[Anum_pg_class_relforcerowsecurity - 1] = BoolGetDatum(rd_rel->relforcerowsecurity);
    values[Anum_pg_class_relhassubclass - 1] = BoolGetDatum(rd_rel->relhassubclass);
    values[Anum_pg_class_relispopulated - 1] = BoolGetDatum(rd_rel->relispopulated);
    values[Anum_pg_class_relreplident - 1] = CharGetDatum(rd_rel->relreplident);
    values[Anum_pg_class_relispartition - 1] = BoolGetDatum(rd_rel->relispartition);
    values[Anum_pg_class_relrewrite - 1] = ObjectIdGetDatum(rd_rel->relrewrite);
    values[Anum_pg_class_relfrozenxid - 1] = TransactionIdGetDatum(rd_rel->relfrozenxid);
    values[Anum_pg_class_relminmxid - 1] = MultiXactIdGetDatum(rd_rel->relminmxid);
    if (relacl != (Datum) 0)
        values[Anum_pg_class_relacl - 1] = relacl;
    else
        nulls[Anum_pg_class_relacl - 1] = true;
    if (reloptions != (Datum) 0)
        values[Anum_pg_class_reloptions - 1] = reloptions;
    else
        nulls[Anum_pg_class_reloptions - 1] = true;

    /* relpartbound is set by updating this tuple, if necessary */
    nulls[Anum_pg_class_relpartbound - 1] = true;

    tup = heap_form_tuple(RelationGetDescr(pg_class_desc), values, nulls);

    /* finally insert the new tuple, update the indexes, and clean up */
    CatalogTupleInsert(pg_class_desc, tup);

    heap_freetuple(tup);
}

MergeWithExistingConstraint()

static bool MergeWithExistingConstraint ( Relation  rel, const char *  ccname, Node *  expr, bool  allow_merge, bool  is_local, bool  is_initially_valid, bool  is_no_inherit  )

static

Definition at line 2831 of file heap.c.

References Assert, BTEqualStrategyNumber, CatalogTupleUpdate(), CStringGetDatum, elog, equal(), ereport, errcode(), ERRCODE_DUPLICATE_OBJECT, errmsg(), ERROR, fastgetattr, GETSTRUCT, heap_copytuple(), HeapTupleIsValid, InvalidOid, NOTICE, ObjectIdGetDatum, RelationData::rd_att, RelationData::rd_rel, RelationGetRelationName, RelationGetRelid, RowExclusiveLock, ScanKeyInit(), stringToNode(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), table_open(), TextDatumGetCString, and val.

Referenced by AddRelationNewConstraints().

{
    bool        found;
    Relation    conDesc;
    SysScanDesc conscan;
    ScanKeyData skey[3];
    HeapTuple   tup;

    /* Search for a pg_constraint entry with same name and relation */
    conDesc = table_open(ConstraintRelationId, RowExclusiveLock);

    found = false;

    ScanKeyInit(&skey[0],
                Anum_pg_constraint_conrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(RelationGetRelid(rel)));
    ScanKeyInit(&skey[1],
                Anum_pg_constraint_contypid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(InvalidOid));
    ScanKeyInit(&skey[2],
                Anum_pg_constraint_conname,
                BTEqualStrategyNumber, F_NAMEEQ,
                CStringGetDatum(ccname));

    conscan = systable_beginscan(conDesc, ConstraintRelidTypidNameIndexId, true,
                                 NULL, 3, skey);

    /* There can be at most one matching row */
    if (HeapTupleIsValid(tup = systable_getnext(conscan)))
    {
        Form_pg_constraint con = (Form_pg_constraint) GETSTRUCT(tup);

        /* Found it.  Conflicts if not identical check constraint */
        if (con->contype == CONSTRAINT_CHECK)
        {
            Datum       val;
            bool        isnull;

            val = fastgetattr(tup,
                              Anum_pg_constraint_conbin,
                              conDesc->rd_att, &isnull);
            if (isnull)
                elog(ERROR, "null conbin for rel %s",
                     RelationGetRelationName(rel));
            if (equal(expr, stringToNode(TextDatumGetCString(val))))
                found = true;
        }

        /*
         * If the existing constraint is purely inherited (no local
         * definition) then interpret addition of a local constraint as a
         * legal merge.  This allows ALTER ADD CONSTRAINT on parent and child
         * tables to be given in either order with same end state.  However if
         * the relation is a partition, all inherited constraints are always
         * non-local, including those that were merged.
         */
        if (is_local && !con->conislocal && !rel->rd_rel->relispartition)
            allow_merge = true;

        if (!found || !allow_merge)
            ereport(ERROR,
                    (errcode(ERRCODE_DUPLICATE_OBJECT),
                     errmsg("constraint \"%s\" for relation \"%s\" already exists",
                            ccname, RelationGetRelationName(rel))));

        /* If the child constraint is "no inherit" then cannot merge */
        if (con->connoinherit)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("constraint \"%s\" conflicts with non-inherited constraint on relation \"%s\"",
                            ccname, RelationGetRelationName(rel))));

        /*
         * Must not change an existing inherited constraint to "no inherit"
         * status.  That's because inherited constraints should be able to
         * propagate to lower-level children.
         */
        if (con->coninhcount > 0 && is_no_inherit)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("constraint \"%s\" conflicts with inherited constraint on relation \"%s\"",
                            ccname, RelationGetRelationName(rel))));

        /*
         * If the child constraint is "not valid" then cannot merge with a
         * valid parent constraint.
         */
        if (is_initially_valid && !con->convalidated)
            ereport(ERROR,
                    (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                     errmsg("constraint \"%s\" conflicts with NOT VALID constraint on relation \"%s\"",
                            ccname, RelationGetRelationName(rel))));

        /* OK to update the tuple */
        ereport(NOTICE,
                (errmsg("merging constraint \"%s\" with inherited definition",
                        ccname)));

        tup = heap_copytuple(tup);
        con = (Form_pg_constraint) GETSTRUCT(tup);

        /*
         * In case of partitions, an inherited constraint must be inherited
         * only once since it cannot have multiple parents and it is never
         * considered local.
         */
        if (rel->rd_rel->relispartition)
        {
            con->coninhcount = 1;
            con->conislocal = false;
        }
        else
        {
            if (is_local)
                con->conislocal = true;
            else
                con->coninhcount++;
        }

        if (is_no_inherit)
        {
            Assert(is_local);
            con->connoinherit = true;
        }

        CatalogTupleUpdate(conDesc, &tup->t_self, tup);
    }

    systable_endscan(conscan);
    table_close(conDesc, RowExclusiveLock);

    return found;
}

RelationClearMissing()

void RelationClearMissing

(

Relation

rel

)

Definition at line 2079 of file heap.c.

References ATTNUM, attnum, BoolGetDatum, CatalogTupleUpdate(), elog, ERROR, GETSTRUCT, heap_freetuple(), heap_modify_tuple(), HeapTupleIsValid, Int16GetDatum, ObjectIdGetDatum, RelationGetDescr, RelationGetNumberOfAttributes, RelationGetRelid, ReleaseSysCache(), RowExclusiveLock, SearchSysCache2(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by ATExecAlterColumnType(), and finish_heap_swap().

{
    Relation    attr_rel;
    Oid         relid = RelationGetRelid(rel);
    int         natts = RelationGetNumberOfAttributes(rel);
    int         attnum;
    Datum       repl_val[Natts_pg_attribute];
    bool        repl_null[Natts_pg_attribute];
    bool        repl_repl[Natts_pg_attribute];
    Form_pg_attribute attrtuple;
    HeapTuple   tuple,
                newtuple;

    memset(repl_val, 0, sizeof(repl_val));
    memset(repl_null, false, sizeof(repl_null));
    memset(repl_repl, false, sizeof(repl_repl));

    repl_val[Anum_pg_attribute_atthasmissing - 1] = BoolGetDatum(false);
    repl_null[Anum_pg_attribute_attmissingval - 1] = true;

    repl_repl[Anum_pg_attribute_atthasmissing - 1] = true;
    repl_repl[Anum_pg_attribute_attmissingval - 1] = true;


    /* Get a lock on pg_attribute */
    attr_rel = table_open(AttributeRelationId, RowExclusiveLock);

    /* process each non-system attribute, including any dropped columns */
    for (attnum = 1; attnum <= natts; attnum++)
    {
        tuple = SearchSysCache2(ATTNUM,
                                ObjectIdGetDatum(relid),
                                Int16GetDatum(attnum));
        if (!HeapTupleIsValid(tuple))   /* shouldn't happen */
            elog(ERROR, "cache lookup failed for attribute %d of relation %u",
                 attnum, relid);

        attrtuple = (Form_pg_attribute) GETSTRUCT(tuple);

        /* ignore any where atthasmissing is not true */
        if (attrtuple->atthasmissing)
        {
            newtuple = heap_modify_tuple(tuple, RelationGetDescr(attr_rel),
                                         repl_val, repl_null, repl_repl);

            CatalogTupleUpdate(attr_rel, &newtuple->t_self, newtuple);

            heap_freetuple(newtuple);
        }

        ReleaseSysCache(tuple);
    }

    /*
     * Our update of the pg_attribute rows will force a relcache rebuild, so
     * there's nothing else to do here.
     */
    table_close(attr_rel, RowExclusiveLock);
}

RelationRemoveInheritance()

static void RelationRemoveInheritance ( Oid  relid )

static

Definition at line 1521 of file heap.c.

References BTEqualStrategyNumber, CatalogTupleDelete(), HeapTupleIsValid, sort-test::key, ObjectIdGetDatum, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by heap_drop_with_catalog().

{
    Relation    catalogRelation;
    SysScanDesc scan;
    ScanKeyData key;
    HeapTuple   tuple;

    catalogRelation = table_open(InheritsRelationId, RowExclusiveLock);

    ScanKeyInit(&key,
                Anum_pg_inherits_inhrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));

    scan = systable_beginscan(catalogRelation, InheritsRelidSeqnoIndexId, true,
                              NULL, 1, &key);

    while (HeapTupleIsValid(tuple = systable_getnext(scan)))
        CatalogTupleDelete(catalogRelation, &tuple->t_self);

    systable_endscan(scan);
    table_close(catalogRelation, RowExclusiveLock);
}

RelationTruncateIndexes()

static void RelationTruncateIndexes ( Relation  heapRelation )

static

Definition at line 3280 of file heap.c.

References AccessExclusiveLock, BuildDummyIndexInfo(), index_build(), index_close(), index_open(), lfirst_oid, NoLock, RelationGetIndexList(), and RelationTruncate().

Referenced by heap_truncate_one_rel().

{
    ListCell   *indlist;

    /* Ask the relcache to produce a list of the indexes of the rel */
    foreach(indlist, RelationGetIndexList(heapRelation))
    {
        Oid         indexId = lfirst_oid(indlist);
        Relation    currentIndex;
        IndexInfo  *indexInfo;

        /* Open the index relation; use exclusive lock, just to be sure */
        currentIndex = index_open(indexId, AccessExclusiveLock);

        /*
         * Fetch info needed for index_build.  Since we know there are no
         * tuples that actually need indexing, we can use a dummy IndexInfo.
         * This is slightly cheaper to build, but the real point is to avoid
         * possibly running user-defined code in index expressions or
         * predicates.  We might be getting invoked during ON COMMIT
         * processing, and we don't want to run any such code then.
         */
        indexInfo = BuildDummyIndexInfo(currentIndex);

        /*
         * Now truncate the actual file (and discard buffers).
         */
        RelationTruncate(currentIndex, 0);

        /* Initialize the index and rebuild */
        /* Note: we do not need to re-establish pkey setting */
        index_build(heapRelation, currentIndex, indexInfo, true, false);

        /* We're done with this index */
        index_close(currentIndex, NoLock);
    }
}

RemoveAttrDefault()

void RemoveAttrDefault	(	Oid	relid,
		AttrNumber	attnum,
		DropBehavior	behavior,
		bool	complain,
		bool	internal
	)

Definition at line 1774 of file heap.c.

References BTEqualStrategyNumber, elog, ERROR, GETSTRUCT, HeapTupleIsValid, Int16GetDatum, ObjectAddressStack::object, ObjectIdGetDatum, PERFORM_DELETION_INTERNAL, performDeletion(), RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), table_close(), and table_open().

Referenced by ATExecAlterColumnType(), ATExecColumnDefault(), ATExecCookedColumnDefault(), and ATExecDropExpression().

{
    Relation    attrdef_rel;
    ScanKeyData scankeys[2];
    SysScanDesc scan;
    HeapTuple   tuple;
    bool        found = false;

    attrdef_rel = table_open(AttrDefaultRelationId, RowExclusiveLock);

    ScanKeyInit(&scankeys[0],
                Anum_pg_attrdef_adrelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));
    ScanKeyInit(&scankeys[1],
                Anum_pg_attrdef_adnum,
                BTEqualStrategyNumber, F_INT2EQ,
                Int16GetDatum(attnum));

    scan = systable_beginscan(attrdef_rel, AttrDefaultIndexId, true,
                              NULL, 2, scankeys);

    /* There should be at most one matching tuple, but we loop anyway */
    while (HeapTupleIsValid(tuple = systable_getnext(scan)))
    {
        ObjectAddress object;
        Form_pg_attrdef attrtuple = (Form_pg_attrdef) GETSTRUCT(tuple);

        object.classId = AttrDefaultRelationId;
        object.objectId = attrtuple->oid;
        object.objectSubId = 0;

        performDeletion(&object, behavior,
                        internal ? PERFORM_DELETION_INTERNAL : 0);

        found = true;
    }

    systable_endscan(scan);
    table_close(attrdef_rel, RowExclusiveLock);

    if (complain && !found)
        elog(ERROR, "could not find attrdef tuple for relation %u attnum %d",
             relid, attnum);
}

RemoveAttrDefaultById()

void RemoveAttrDefaultById

(

Oid

attrdefId

)

Definition at line 1829 of file heap.c.

References AccessExclusiveLock, ATTNUM, BTEqualStrategyNumber, CatalogTupleDelete(), CatalogTupleUpdate(), elog, ERROR, GETSTRUCT, HeapTupleIsValid, Int16GetDatum, NoLock, ObjectIdGetDatum, relation_close(), relation_open(), RowExclusiveLock, ScanKeyInit(), SearchSysCacheCopy2, systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by doDeletion().

{
    Relation    attrdef_rel;
    Relation    attr_rel;
    Relation    myrel;
    ScanKeyData scankeys[1];
    SysScanDesc scan;
    HeapTuple   tuple;
    Oid         myrelid;
    AttrNumber  myattnum;

    /* Grab an appropriate lock on the pg_attrdef relation */
    attrdef_rel = table_open(AttrDefaultRelationId, RowExclusiveLock);

    /* Find the pg_attrdef tuple */
    ScanKeyInit(&scankeys[0],
                Anum_pg_attrdef_oid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(attrdefId));

    scan = systable_beginscan(attrdef_rel, AttrDefaultOidIndexId, true,
                              NULL, 1, scankeys);

    tuple = systable_getnext(scan);
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "could not find tuple for attrdef %u", attrdefId);

    myrelid = ((Form_pg_attrdef) GETSTRUCT(tuple))->adrelid;
    myattnum = ((Form_pg_attrdef) GETSTRUCT(tuple))->adnum;

    /* Get an exclusive lock on the relation owning the attribute */
    myrel = relation_open(myrelid, AccessExclusiveLock);

    /* Now we can delete the pg_attrdef row */
    CatalogTupleDelete(attrdef_rel, &tuple->t_self);

    systable_endscan(scan);
    table_close(attrdef_rel, RowExclusiveLock);

    /* Fix the pg_attribute row */
    attr_rel = table_open(AttributeRelationId, RowExclusiveLock);

    tuple = SearchSysCacheCopy2(ATTNUM,
                                ObjectIdGetDatum(myrelid),
                                Int16GetDatum(myattnum));
    if (!HeapTupleIsValid(tuple))   /* shouldn't happen */
        elog(ERROR, "cache lookup failed for attribute %d of relation %u",
             myattnum, myrelid);

    ((Form_pg_attribute) GETSTRUCT(tuple))->atthasdef = false;

    CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);

    /*
     * Our update of the pg_attribute row will force a relcache rebuild, so
     * there's nothing else to do here.
     */
    table_close(attr_rel, RowExclusiveLock);

    /* Keep lock on attribute's rel until end of xact */
    relation_close(myrel, NoLock);
}

RemoveAttributeById()

void RemoveAttributeById	(	Oid	relid,
		AttrNumber	attnum
	)

Definition at line 1661 of file heap.c.

References AccessExclusiveLock, ATTNUM, BoolGetDatum, CatalogTupleDelete(), CatalogTupleUpdate(), elog, ERROR, GETSTRUCT, heap_modify_tuple(), HeapTupleIsValid, Int16GetDatum, InvalidOid, MemSet, NAMEDATALEN, namestrcpy(), NoLock, ObjectIdGetDatum, relation_close(), relation_open(), RelationGetDescr, RemoveStatistics(), RowExclusiveLock, SearchSysCacheCopy2, snprintf, HeapTupleData::t_self, table_close(), and table_open().

Referenced by doDeletion().

{
    Relation    rel;
    Relation    attr_rel;
    HeapTuple   tuple;
    Form_pg_attribute attStruct;
    char        newattname[NAMEDATALEN];

    /*
     * Grab an exclusive lock on the target table, which we will NOT release
     * until end of transaction.  (In the simple case where we are directly
     * dropping this column, ATExecDropColumn already did this ... but when
     * cascading from a drop of some other object, we may not have any lock.)
     */
    rel = relation_open(relid, AccessExclusiveLock);

    attr_rel = table_open(AttributeRelationId, RowExclusiveLock);

    tuple = SearchSysCacheCopy2(ATTNUM,
                                ObjectIdGetDatum(relid),
                                Int16GetDatum(attnum));
    if (!HeapTupleIsValid(tuple))   /* shouldn't happen */
        elog(ERROR, "cache lookup failed for attribute %d of relation %u",
             attnum, relid);
    attStruct = (Form_pg_attribute) GETSTRUCT(tuple);

    if (attnum < 0)
    {
        /* System attribute (probably OID) ... just delete the row */

        CatalogTupleDelete(attr_rel, &tuple->t_self);
    }
    else
    {
        /* Dropping user attributes is lots harder */

        /* Mark the attribute as dropped */
        attStruct->attisdropped = true;

        /*
         * Set the type OID to invalid.  A dropped attribute's type link
         * cannot be relied on (once the attribute is dropped, the type might
         * be too). Fortunately we do not need the type row --- the only
         * really essential information is the type's typlen and typalign,
         * which are preserved in the attribute's attlen and attalign.  We set
         * atttypid to zero here as a means of catching code that incorrectly
         * expects it to be valid.
         */
        attStruct->atttypid = InvalidOid;

        /* Remove any NOT NULL constraint the column may have */
        attStruct->attnotnull = false;

        /* We don't want to keep stats for it anymore */
        attStruct->attstattarget = 0;

        /* Unset this so no one tries to look up the generation expression */
        attStruct->attgenerated = '\0';

        /*
         * Change the column name to something that isn't likely to conflict
         */
        snprintf(newattname, sizeof(newattname),
                 "........pg.dropped.%d........", attnum);
        namestrcpy(&(attStruct->attname), newattname);

        /* clear the missing value if any */
        if (attStruct->atthasmissing)
        {
            Datum       valuesAtt[Natts_pg_attribute];
            bool        nullsAtt[Natts_pg_attribute];
            bool        replacesAtt[Natts_pg_attribute];

            /* update the tuple - set atthasmissing and attmissingval */
            MemSet(valuesAtt, 0, sizeof(valuesAtt));
            MemSet(nullsAtt, false, sizeof(nullsAtt));
            MemSet(replacesAtt, false, sizeof(replacesAtt));

            valuesAtt[Anum_pg_attribute_atthasmissing - 1] =
                BoolGetDatum(false);
            replacesAtt[Anum_pg_attribute_atthasmissing - 1] = true;
            valuesAtt[Anum_pg_attribute_attmissingval - 1] = (Datum) 0;
            nullsAtt[Anum_pg_attribute_attmissingval - 1] = true;
            replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;

            tuple = heap_modify_tuple(tuple, RelationGetDescr(attr_rel),
                                      valuesAtt, nullsAtt, replacesAtt);
        }

        CatalogTupleUpdate(attr_rel, &tuple->t_self, tuple);
    }

    /*
     * Because updating the pg_attribute row will trigger a relcache flush for
     * the target relation, we need not do anything else to notify other
     * backends of the change.
     */

    table_close(attr_rel, RowExclusiveLock);

    if (attnum > 0)
        RemoveStatistics(relid, attnum);

    relation_close(rel, NoLock);
}

RemovePartitionKeyByRelId()

void RemovePartitionKeyByRelId

(

Oid

relid

)

Definition at line 3763 of file heap.c.

References CatalogTupleDelete(), elog, ERROR, HeapTupleIsValid, ObjectIdGetDatum, PARTRELID, ReleaseSysCache(), RowExclusiveLock, SearchSysCache1(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by heap_drop_with_catalog().

{
    Relation    rel;
    HeapTuple   tuple;

    rel = table_open(PartitionedRelationId, RowExclusiveLock);

    tuple = SearchSysCache1(PARTRELID, ObjectIdGetDatum(relid));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for partition key of relation %u",
             relid);

    CatalogTupleDelete(rel, &tuple->t_self);

    ReleaseSysCache(tuple);
    table_close(rel, RowExclusiveLock);
}

RemoveStatistics()

void RemoveStatistics	(	Oid	relid,
		AttrNumber	attnum
	)

Definition at line 3233 of file heap.c.

References BTEqualStrategyNumber, CatalogTupleDelete(), HeapTupleIsValid, Int16GetDatum, sort-test::key, ObjectIdGetDatum, RowExclusiveLock, ScanKeyInit(), systable_beginscan(), systable_endscan(), systable_getnext(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by ATExecAlterColumnType(), heap_drop_with_catalog(), index_drop(), and RemoveAttributeById().

{
    Relation    pgstatistic;
    SysScanDesc scan;
    ScanKeyData key[2];
    int         nkeys;
    HeapTuple   tuple;

    pgstatistic = table_open(StatisticRelationId, RowExclusiveLock);

    ScanKeyInit(&key[0],
                Anum_pg_statistic_starelid,
                BTEqualStrategyNumber, F_OIDEQ,
                ObjectIdGetDatum(relid));

    if (attnum == 0)
        nkeys = 1;
    else
    {
        ScanKeyInit(&key[1],
                    Anum_pg_statistic_staattnum,
                    BTEqualStrategyNumber, F_INT2EQ,
                    Int16GetDatum(attnum));
        nkeys = 2;
    }

    scan = systable_beginscan(pgstatistic, StatisticRelidAttnumInhIndexId, true,
                              NULL, nkeys, key);

    /* we must loop even when attnum != 0, in case of inherited stats */
    while (HeapTupleIsValid(tuple = systable_getnext(scan)))
        CatalogTupleDelete(pgstatistic, &tuple->t_self);

    systable_endscan(scan);

    table_close(pgstatistic, RowExclusiveLock);
}

SetAttrMissing()

void SetAttrMissing	(	Oid	relid,
		char *	attname,
		char *	value
	)

Definition at line 2147 of file heap.c.

References AccessExclusiveLock, BoolGetDatum, CatalogTupleUpdate(), CStringGetDatum, elog, ERROR, GETSTRUCT, heap_modify_tuple(), HeapTupleIsValid, Int32GetDatum, MemSet, ObjectIdGetDatum, OidFunctionCall3, RelationData::rd_rel, RelationGetDescr, ReleaseSysCache(), RowExclusiveLock, SearchSysCacheAttName(), HeapTupleData::t_self, table_close(), and table_open().

Referenced by binary_upgrade_set_missing_value().

{
    Datum       valuesAtt[Natts_pg_attribute];
    bool        nullsAtt[Natts_pg_attribute];
    bool        replacesAtt[Natts_pg_attribute];
    Datum       missingval;
    Form_pg_attribute attStruct;
    Relation    attrrel,
                tablerel;
    HeapTuple   atttup,
                newtup;

    /* lock the table the attribute belongs to */
    tablerel = table_open(relid, AccessExclusiveLock);

    /* Don't do anything unless it's a plain table */
    if (tablerel->rd_rel->relkind != RELKIND_RELATION)
    {
        table_close(tablerel, AccessExclusiveLock);
        return;
    }

    /* Lock the attribute row and get the data */
    attrrel = table_open(AttributeRelationId, RowExclusiveLock);
    atttup = SearchSysCacheAttName(relid, attname);
    if (!HeapTupleIsValid(atttup))
        elog(ERROR, "cache lookup failed for attribute %s of relation %u",
             attname, relid);
    attStruct = (Form_pg_attribute) GETSTRUCT(atttup);

    /* get an array value from the value string */
    missingval = OidFunctionCall3(F_ARRAY_IN,
                                  CStringGetDatum(value),
                                  ObjectIdGetDatum(attStruct->atttypid),
                                  Int32GetDatum(attStruct->atttypmod));

    /* update the tuple - set atthasmissing and attmissingval */
    MemSet(valuesAtt, 0, sizeof(valuesAtt));
    MemSet(nullsAtt, false, sizeof(nullsAtt));
    MemSet(replacesAtt, false, sizeof(replacesAtt));

    valuesAtt[Anum_pg_attribute_atthasmissing - 1] = BoolGetDatum(true);
    replacesAtt[Anum_pg_attribute_atthasmissing - 1] = true;
    valuesAtt[Anum_pg_attribute_attmissingval - 1] = missingval;
    replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;

    newtup = heap_modify_tuple(atttup, RelationGetDescr(attrrel),
                               valuesAtt, nullsAtt, replacesAtt);
    CatalogTupleUpdate(attrrel, &newtup->t_self, newtup);

    /* clean up */
    ReleaseSysCache(atttup);
    table_close(attrrel, RowExclusiveLock);
    table_close(tablerel, AccessExclusiveLock);
}

SetRelationNumChecks()

static void SetRelationNumChecks ( Relation  rel, int  numchecks  )

static

Definition at line 2981 of file heap.c.

References CacheInvalidateRelcache(), CatalogTupleUpdate(), elog, ERROR, GETSTRUCT, heap_freetuple(), HeapTupleIsValid, ObjectIdGetDatum, RelationGetRelid, RELOID, RowExclusiveLock, SearchSysCacheCopy1, HeapTupleData::t_self, table_close(), and table_open().

Referenced by AddRelationNewConstraints(), and StoreConstraints().

{
    Relation    relrel;
    HeapTuple   reltup;
    Form_pg_class relStruct;

    relrel = table_open(RelationRelationId, RowExclusiveLock);
    reltup = SearchSysCacheCopy1(RELOID,
                                 ObjectIdGetDatum(RelationGetRelid(rel)));
    if (!HeapTupleIsValid(reltup))
        elog(ERROR, "cache lookup failed for relation %u",
             RelationGetRelid(rel));
    relStruct = (Form_pg_class) GETSTRUCT(reltup);

    if (relStruct->relchecks != numchecks)
    {
        relStruct->relchecks = numchecks;

        CatalogTupleUpdate(relrel, &reltup->t_self, reltup);
    }
    else
    {
        /* Skip the disk update, but force relcache inval anyway */
        CacheInvalidateRelcache(rel);
    }

    heap_freetuple(reltup);
    table_close(relrel, RowExclusiveLock);
}

StoreAttrDefault()

Oid StoreAttrDefault	(	Relation	rel,
		AttrNumber	attnum,
		Node *	expr,
		bool	is_internal,
		bool	add_column_mode
	)

Definition at line 2215 of file heap.c.

References ATTNUM, attnum, CatalogTupleInsert(), CatalogTupleUpdate(), ObjectAddress::classId, construct_array(), CreateExecutorState(), CStringGetTextDatum, DatumGetPointer, DEPENDENCY_AUTO, DEPENDENCY_NORMAL, elog, ERROR, ExecEvalExpr(), ExecPrepareExpr(), expression_planner(), FreeExecutorState(), GetNewOidWithIndex(), GetPerTupleExprContext, GETSTRUCT, heap_form_tuple(), heap_freetuple(), heap_modify_tuple(), HeapTupleIsValid, Int16GetDatum, InvokeObjectPostCreateHookArg, MemSet, nodeToString(), ObjectAddress::objectId, ObjectIdGetDatum, ObjectAddress::objectSubId, pfree(), PointerGetDatum, RelationData::rd_att, RelationData::rd_rel, recordDependencyOn(), recordDependencyOnSingleRelExpr(), RelationGetDescr, RelationGetRelid, RowExclusiveLock, SearchSysCacheCopy2, HeapTupleData::t_self, table_close(), table_open(), TupleDescAttr, and values.

Referenced by AddRelationNewConstraints(), ATExecAlterColumnType(), ATExecCookedColumnDefault(), and StoreConstraints().

{
    char       *adbin;
    Relation    adrel;
    HeapTuple   tuple;
    Datum       values[4];
    static bool nulls[4] = {false, false, false, false};
    Relation    attrrel;
    HeapTuple   atttup;
    Form_pg_attribute attStruct;
    char        attgenerated;
    Oid         attrdefOid;
    ObjectAddress colobject,
                defobject;

    adrel = table_open(AttrDefaultRelationId, RowExclusiveLock);

    /*
     * Flatten expression to string form for storage.
     */
    adbin = nodeToString(expr);

    /*
     * Make the pg_attrdef entry.
     */
    attrdefOid = GetNewOidWithIndex(adrel, AttrDefaultOidIndexId,
                                    Anum_pg_attrdef_oid);
    values[Anum_pg_attrdef_oid - 1] = ObjectIdGetDatum(attrdefOid);
    values[Anum_pg_attrdef_adrelid - 1] = RelationGetRelid(rel);
    values[Anum_pg_attrdef_adnum - 1] = attnum;
    values[Anum_pg_attrdef_adbin - 1] = CStringGetTextDatum(adbin);

    tuple = heap_form_tuple(adrel->rd_att, values, nulls);
    CatalogTupleInsert(adrel, tuple);

    defobject.classId = AttrDefaultRelationId;
    defobject.objectId = attrdefOid;
    defobject.objectSubId = 0;

    table_close(adrel, RowExclusiveLock);

    /* now can free some of the stuff allocated above */
    pfree(DatumGetPointer(values[Anum_pg_attrdef_adbin - 1]));
    heap_freetuple(tuple);
    pfree(adbin);

    /*
     * Update the pg_attribute entry for the column to show that a default
     * exists.
     */
    attrrel = table_open(AttributeRelationId, RowExclusiveLock);
    atttup = SearchSysCacheCopy2(ATTNUM,
                                 ObjectIdGetDatum(RelationGetRelid(rel)),
                                 Int16GetDatum(attnum));
    if (!HeapTupleIsValid(atttup))
        elog(ERROR, "cache lookup failed for attribute %d of relation %u",
             attnum, RelationGetRelid(rel));
    attStruct = (Form_pg_attribute) GETSTRUCT(atttup);
    attgenerated = attStruct->attgenerated;
    if (!attStruct->atthasdef)
    {
        Form_pg_attribute defAttStruct;

        ExprState  *exprState;
        Expr       *expr2 = (Expr *) expr;
        EState     *estate = NULL;
        ExprContext *econtext;
        Datum       valuesAtt[Natts_pg_attribute];
        bool        nullsAtt[Natts_pg_attribute];
        bool        replacesAtt[Natts_pg_attribute];
        Datum       missingval = (Datum) 0;
        bool        missingIsNull = true;

        MemSet(valuesAtt, 0, sizeof(valuesAtt));
        MemSet(nullsAtt, false, sizeof(nullsAtt));
        MemSet(replacesAtt, false, sizeof(replacesAtt));
        valuesAtt[Anum_pg_attribute_atthasdef - 1] = true;
        replacesAtt[Anum_pg_attribute_atthasdef - 1] = true;

        if (rel->rd_rel->relkind == RELKIND_RELATION && add_column_mode &&
            !attgenerated)
        {
            expr2 = expression_planner(expr2);
            estate = CreateExecutorState();
            exprState = ExecPrepareExpr(expr2, estate);
            econtext = GetPerTupleExprContext(estate);

            missingval = ExecEvalExpr(exprState, econtext,
                                      &missingIsNull);

            FreeExecutorState(estate);

            defAttStruct = TupleDescAttr(rel->rd_att, attnum - 1);

            if (missingIsNull)
            {
                /* if the default evaluates to NULL, just store a NULL array */
                missingval = (Datum) 0;
            }
            else
            {
                /* otherwise make a one-element array of the value */
                missingval = PointerGetDatum(construct_array(&missingval,
                                                             1,
                                                             defAttStruct->atttypid,
                                                             defAttStruct->attlen,
                                                             defAttStruct->attbyval,
                                                             defAttStruct->attalign));
            }

            valuesAtt[Anum_pg_attribute_atthasmissing - 1] = !missingIsNull;
            replacesAtt[Anum_pg_attribute_atthasmissing - 1] = true;
            valuesAtt[Anum_pg_attribute_attmissingval - 1] = missingval;
            replacesAtt[Anum_pg_attribute_attmissingval - 1] = true;
            nullsAtt[Anum_pg_attribute_attmissingval - 1] = missingIsNull;
        }
        atttup = heap_modify_tuple(atttup, RelationGetDescr(attrrel),
                                   valuesAtt, nullsAtt, replacesAtt);

        CatalogTupleUpdate(attrrel, &atttup->t_self, atttup);

        if (!missingIsNull)
            pfree(DatumGetPointer(missingval));

    }
    table_close(attrrel, RowExclusiveLock);
    heap_freetuple(atttup);

    /*
     * Make a dependency so that the pg_attrdef entry goes away if the column
     * (or whole table) is deleted.
     */
    colobject.classId = RelationRelationId;
    colobject.objectId = RelationGetRelid(rel);
    colobject.objectSubId = attnum;

    recordDependencyOn(&defobject, &colobject, DEPENDENCY_AUTO);

    /*
     * Record dependencies on objects used in the expression, too.
     */
    if (attgenerated)
    {
        /*
         * Generated column: Dropping anything that the generation expression
         * refers to automatically drops the generated column.
         */
        recordDependencyOnSingleRelExpr(&colobject, expr, RelationGetRelid(rel),
                                        DEPENDENCY_AUTO,
                                        DEPENDENCY_AUTO, false);
    }
    else
    {
        /*
         * Normal default: Dropping anything that the default refers to
         * requires CASCADE and drops the default only.
         */
        recordDependencyOnSingleRelExpr(&defobject, expr, RelationGetRelid(rel),
                                        DEPENDENCY_NORMAL,
                                        DEPENDENCY_NORMAL, false);
    }

    /*
     * Post creation hook for attribute defaults.
     *
     * XXX. ALTER TABLE ALTER COLUMN SET/DROP DEFAULT is implemented with a
     * couple of deletion/creation of the attribute's default entry, so the
     * callee should check existence of an older version of this entry if it
     * needs to distinguish.
     */
    InvokeObjectPostCreateHookArg(AttrDefaultRelationId,
                                  RelationGetRelid(rel), attnum, is_internal);

    return attrdefOid;
}

StoreConstraints()

static void StoreConstraints ( Relation  rel, List *  cooked_constraints, bool  is_internal  )

static

Definition at line 2509 of file heap.c.

References CookedConstraint::attnum, CommandCounterIncrement(), CookedConstraint::conoid, CONSTR_CHECK, CONSTR_DEFAULT, CookedConstraint::contype, elog, ERROR, CookedConstraint::expr, CookedConstraint::inhcount, CookedConstraint::is_local, CookedConstraint::is_no_inherit, lfirst, CookedConstraint::name, NIL, SetRelationNumChecks(), CookedConstraint::skip_validation, StoreAttrDefault(), and StoreRelCheck().

Referenced by heap_create_with_catalog().

{
    int         numchecks = 0;
    ListCell   *lc;

    if (cooked_constraints == NIL)
        return;                 /* nothing to do */

    /*
     * Deparsing of constraint expressions will fail unless the just-created
     * pg_attribute tuples for this relation are made visible.  So, bump the
     * command counter.  CAUTION: this will cause a relcache entry rebuild.
     */
    CommandCounterIncrement();

    foreach(lc, cooked_constraints)
    {
        CookedConstraint *con = (CookedConstraint *) lfirst(lc);

        switch (con->contype)
        {
            case CONSTR_DEFAULT:
                con->conoid = StoreAttrDefault(rel, con->attnum, con->expr,
                                               is_internal, false);
                break;
            case CONSTR_CHECK:
                con->conoid =
                    StoreRelCheck(rel, con->name, con->expr,
                                  !con->skip_validation, con->is_local,
                                  con->inhcount, con->is_no_inherit,
                                  is_internal);
                numchecks++;
                break;
            default:
                elog(ERROR, "unrecognized constraint type: %d",
                     (int) con->contype);
        }
    }

    if (numchecks > 0)
        SetRelationNumChecks(rel, numchecks);
}

StorePartitionBound()

void StorePartitionBound	(	Relation	rel,
		Relation	parent,
		PartitionBoundSpec *	bound
	)

Definition at line 3794 of file heap.c.

References Assert, CacheInvalidateRelcache(), CacheInvalidateRelcacheByRelid(), CatalogTupleUpdate(), CommandCounterIncrement(), CStringGetTextDatum, elog, ERROR, get_default_oid_from_partdesc(), GETSTRUCT, heap_freetuple(), heap_modify_tuple(), HeapTupleIsValid, PartitionBoundSpec::is_default, nodeToString(), ObjectIdGetDatum, OidIsValid, RelationGetDescr, RelationGetPartitionDesc(), RelationGetRelid, RELOID, RowExclusiveLock, SearchSysCacheCopy1, SysCacheGetAttr(), HeapTupleData::t_self, table_close(), table_open(), and update_default_partition_oid().

Referenced by ATExecAttachPartition(), and DefineRelation().

{
    Relation    classRel;
    HeapTuple   tuple,
                newtuple;
    Datum       new_val[Natts_pg_class];
    bool        new_null[Natts_pg_class],
                new_repl[Natts_pg_class];
    Oid         defaultPartOid;

    /* Update pg_class tuple */
    classRel = table_open(RelationRelationId, RowExclusiveLock);
    tuple = SearchSysCacheCopy1(RELOID,
                                ObjectIdGetDatum(RelationGetRelid(rel)));
    if (!HeapTupleIsValid(tuple))
        elog(ERROR, "cache lookup failed for relation %u",
             RelationGetRelid(rel));

#ifdef USE_ASSERT_CHECKING
    {
        Form_pg_class classForm;
        bool        isnull;

        classForm = (Form_pg_class) GETSTRUCT(tuple);
        Assert(!classForm->relispartition);
        (void) SysCacheGetAttr(RELOID, tuple, Anum_pg_class_relpartbound,
                               &isnull);
        Assert(isnull);
    }
#endif

    /* Fill in relpartbound value */
    memset(new_val, 0, sizeof(new_val));
    memset(new_null, false, sizeof(new_null));
    memset(new_repl, false, sizeof(new_repl));
    new_val[Anum_pg_class_relpartbound - 1] = CStringGetTextDatum(nodeToString(bound));
    new_null[Anum_pg_class_relpartbound - 1] = false;
    new_repl[Anum_pg_class_relpartbound - 1] = true;
    newtuple = heap_modify_tuple(tuple, RelationGetDescr(classRel),
                                 new_val, new_null, new_repl);
    /* Also set the flag */
    ((Form_pg_class) GETSTRUCT(newtuple))->relispartition = true;
    CatalogTupleUpdate(classRel, &newtuple->t_self, newtuple);
    heap_freetuple(newtuple);
    table_close(classRel, RowExclusiveLock);

    /*
     * If we're storing bounds for the default partition, update
     * pg_partitioned_table too.
     */
    if (bound->is_default)
        update_default_partition_oid(RelationGetRelid(parent),
                                     RelationGetRelid(rel));

    /* Make these updates visible */
    CommandCounterIncrement();

    /*
     * The partition constraint for the default partition depends on the
     * partition bounds of every other partition, so we must invalidate the
     * relcache entry for that partition every time a partition is added or
     * removed.
     */
    defaultPartOid =
        get_default_oid_from_partdesc(RelationGetPartitionDesc(parent, true));
    if (OidIsValid(defaultPartOid))
        CacheInvalidateRelcacheByRelid(defaultPartOid);

    CacheInvalidateRelcache(parent);
}

StorePartitionKey()

void StorePartitionKey	(	Relation	rel,
		char	strategy,
		int16	partnatts,
		AttrNumber *	partattrs,
		List *	partexprs,
		Oid *	partopclass,
		Oid *	partcollation
	)

Definition at line 3636 of file heap.c.

References add_exact_object_address(), Assert, buildint2vector(), buildoidvector(), CacheInvalidateRelcache(), CatalogTupleInsert(), CharGetDatum, CStringGetTextDatum, DEPENDENCY_INTERNAL, DEPENDENCY_NORMAL, free_object_addresses(), heap_form_tuple(), i, Int16GetDatum, InvalidOid, MemSet, new_object_addresses(), nodeToString(), ObjectAddressSet, ObjectAddressSubSet, ObjectIdGetDatum, OidIsValid, pfree(), PointerGetDatum, RelationData::rd_rel, record_object_address_dependencies(), recordDependencyOn(), recordDependencyOnSingleRelExpr(), RelationGetDescr, RelationGetRelid, RowExclusiveLock, table_close(), table_open(), and values.

Referenced by DefineRelation().

{
    int         i;
    int2vector *partattrs_vec;
    oidvector  *partopclass_vec;
    oidvector  *partcollation_vec;
    Datum       partexprDatum;
    Relation    pg_partitioned_table;
    HeapTuple   tuple;
    Datum       values[Natts_pg_partitioned_table];
    bool        nulls[Natts_pg_partitioned_table];
    ObjectAddress myself;
    ObjectAddress referenced;
    ObjectAddresses *addrs;

    Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);

    /* Copy the partition attribute numbers, opclass OIDs into arrays */
    partattrs_vec = buildint2vector(partattrs, partnatts);
    partopclass_vec = buildoidvector(partopclass, partnatts);
    partcollation_vec = buildoidvector(partcollation, partnatts);

    /* Convert the expressions (if any) to a text datum */
    if (partexprs)
    {
        char       *exprString;

        exprString = nodeToString(partexprs);
        partexprDatum = CStringGetTextDatum(exprString);
        pfree(exprString);
    }
    else
        partexprDatum = (Datum) 0;

    pg_partitioned_table = table_open(PartitionedRelationId, RowExclusiveLock);

    MemSet(nulls, false, sizeof(nulls));

    /* Only this can ever be NULL */
    if (!partexprDatum)
        nulls[Anum_pg_partitioned_table_partexprs - 1] = true;

    values[Anum_pg_partitioned_table_partrelid - 1] = ObjectIdGetDatum(RelationGetRelid(rel));
    values[Anum_pg_partitioned_table_partstrat - 1] = CharGetDatum(strategy);
    values[Anum_pg_partitioned_table_partnatts - 1] = Int16GetDatum(partnatts);
    values[Anum_pg_partitioned_table_partdefid - 1] = ObjectIdGetDatum(InvalidOid);
    values[Anum_pg_partitioned_table_partattrs - 1] = PointerGetDatum(partattrs_vec);
    values[Anum_pg_partitioned_table_partclass - 1] = PointerGetDatum(partopclass_vec);
    values[Anum_pg_partitioned_table_partcollation - 1] = PointerGetDatum(partcollation_vec);
    values[Anum_pg_partitioned_table_partexprs - 1] = partexprDatum;

    tuple = heap_form_tuple(RelationGetDescr(pg_partitioned_table), values, nulls);

    CatalogTupleInsert(pg_partitioned_table, tuple);
    table_close(pg_partitioned_table, RowExclusiveLock);

    /* Mark this relation as dependent on a few things as follows */
    addrs = new_object_addresses();
    ObjectAddressSet(myself, RelationRelationId, RelationGetRelid(rel));

    /* Operator class and collation per key column */
    for (i = 0; i < partnatts; i++)
    {
        ObjectAddressSet(referenced, OperatorClassRelationId, partopclass[i]);
        add_exact_object_address(&referenced, addrs);

        /* The default collation is pinned, so don't bother recording it */
        if (OidIsValid(partcollation[i]) &&
            partcollation[i] != DEFAULT_COLLATION_OID)
        {
            ObjectAddressSet(referenced, CollationRelationId, partcollation[i]);
            add_exact_object_address(&referenced, addrs);
        }
    }

    record_object_address_dependencies(&myself, addrs, DEPENDENCY_NORMAL);
    free_object_addresses(addrs);

    /*
     * The partitioning columns are made internally dependent on the table,
     * because we cannot drop any of them without dropping the whole table.
     * (ATExecDropColumn independently enforces that, but it's not bulletproof
     * so we need the dependencies too.)
     */
    for (i = 0; i < partnatts; i++)
    {
        if (partattrs[i] == 0)
            continue;           /* ignore expressions here */

        ObjectAddressSubSet(referenced, RelationRelationId,
                            RelationGetRelid(rel), partattrs[i]);
        recordDependencyOn(&referenced, &myself, DEPENDENCY_INTERNAL);
    }

    /*
     * Also consider anything mentioned in partition expressions.  External
     * references (e.g. functions) get NORMAL dependencies.  Table columns
     * mentioned in the expressions are handled the same as plain partitioning
     * columns, i.e. they become internally dependent on the whole table.
     */
    if (partexprs)
        recordDependencyOnSingleRelExpr(&myself,
                                        (Node *) partexprs,
                                        RelationGetRelid(rel),
                                        DEPENDENCY_NORMAL,
                                        DEPENDENCY_INTERNAL,
                                        true /* reverse the self-deps */ );

    /*
     * We must invalidate the relcache so that the next
     * CommandCounterIncrement() will cause the same to be rebuilt using the
     * information in just created catalog entry.
     */
    CacheInvalidateRelcache(rel);
}

StoreRelCheck()

static Oid StoreRelCheck ( Relation  rel, const char *  ccname, Node *  expr, bool  is_validated, bool  is_local, int  inhcount, bool  is_no_inherit, bool  is_internal  )

static

Definition at line 2401 of file heap.c.

References CreateConstraintEntry(), ereport, errcode(), errmsg(), ERROR, i, InvalidOid, lfirst, list_length(), nodeToString(), palloc(), pfree(), pull_var_clause(), RelationData::rd_rel, RelationGetNamespace, RelationGetRelationName, RelationGetRelid, and Var::varattno.

Referenced by AddRelationNewConstraints(), and StoreConstraints().

{
    char       *ccbin;
    List       *varList;
    int         keycount;
    int16      *attNos;
    Oid         constrOid;

    /*
     * Flatten expression to string form for storage.
     */
    ccbin = nodeToString(expr);

    /*
     * Find columns of rel that are used in expr
     *
     * NB: pull_var_clause is okay here only because we don't allow subselects
     * in check constraints; it would fail to examine the contents of
     * subselects.
     */
    varList = pull_var_clause(expr, 0);
    keycount = list_length(varList);

    if (keycount > 0)
    {
        ListCell   *vl;
        int         i = 0;

        attNos = (int16 *) palloc(keycount * sizeof(int16));
        foreach(vl, varList)
        {
            Var        *var = (Var *) lfirst(vl);
            int         j;

            for (j = 0; j < i; j++)
                if (attNos[j] == var->varattno)
                    break;
            if (j == i)
                attNos[i++] = var->varattno;
        }
        keycount = i;
    }
    else
        attNos = NULL;

    /*
     * Partitioned tables do not contain any rows themselves, so a NO INHERIT
     * constraint makes no sense.
     */
    if (is_no_inherit &&
        rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_TABLE_DEFINITION),
                 errmsg("cannot add NO INHERIT constraint to partitioned table \"%s\"",
                        RelationGetRelationName(rel))));

    /*
     * Create the Check Constraint
     */
    constrOid =
        CreateConstraintEntry(ccname,   /* Constraint Name */
                              RelationGetNamespace(rel),    /* namespace */
                              CONSTRAINT_CHECK, /* Constraint Type */
                              false,    /* Is Deferrable */
                              false,    /* Is Deferred */
                              is_validated,
                              InvalidOid,   /* no parent constraint */
                              RelationGetRelid(rel),    /* relation */
                              attNos,   /* attrs in the constraint */
                              keycount, /* # key attrs in the constraint */
                              keycount, /* # total attrs in the constraint */
                              InvalidOid,   /* not a domain constraint */
                              InvalidOid,   /* no associated index */
                              InvalidOid,   /* Foreign key fields */
                              NULL,
                              NULL,
                              NULL,
                              NULL,
                              0,
                              ' ',
                              ' ',
                              ' ',
                              NULL, /* not an exclusion constraint */
                              expr, /* Tree form of check constraint */
                              ccbin,    /* Binary form of check constraint */
                              is_local, /* conislocal */
                              inhcount, /* coninhcount */
                              is_no_inherit,    /* connoinherit */
                              is_internal); /* internally constructed? */

    pfree(ccbin);

    return constrOid;
}

SystemAttributeByName()

const FormData_pg_attribute* SystemAttributeByName

(

const char *

attname

)

Definition at line 263 of file heap.c.

References FormData_pg_attribute, lengthof, NameStr, and SysAtt.

Referenced by CheckAttributeNamesTypes(), expanded_record_lookup_field(), specialAttNum(), SPI_fnumber(), and transformIndexConstraint().

{
    int         j;

    for (j = 0; j < (int) lengthof(SysAtt); j++)
    {
        const FormData_pg_attribute *att = SysAtt[j];

        if (strcmp(NameStr(att->attname), attname) == 0)
            return att;
    }

    return NULL;
}

SystemAttributeDefinition()

const FormData_pg_attribute* SystemAttributeDefinition

(

AttrNumber

attno

)

Definition at line 251 of file heap.c.

References elog, ERROR, FormData_pg_attribute, lengthof, and SysAtt.

Referenced by attnumAttName(), attnumTypeId(), build_index_tlist(), scanNSItemForColumn(), SPI_fname(), SPI_gettype(), SPI_gettypeid(), SPI_getvalue(), and transformIndexConstraint().

{
    if (attno >= 0 || attno < -(int) lengthof(SysAtt))
        elog(ERROR, "invalid system attribute number %d", attno);
    return SysAtt[-attno - 1];
}

Variable Documentation

a1

const FormData_pg_attribute a1

static

Initial value:

= {
    .attname = {"ctid"},
    .atttypid = TIDOID,
    .attlen = sizeof(ItemPointerData),
    .attnum = SelfItemPointerAttributeNumber,
    .attcacheoff = -1,
    .atttypmod = -1,
    .attbyval = false,
    .attalign = TYPALIGN_SHORT,
    .attstorage = TYPSTORAGE_PLAIN,
    .attnotnull = true,
    .attislocal = true,
}

Definition at line 153 of file heap.c.

Referenced by aclitem_eq(), aclitemComparator(), brin_minmax_multi_distance_float4(), brin_minmax_multi_distance_float8(), brin_minmax_multi_distance_int2(), brin_minmax_multi_distance_int4(), brin_minmax_multi_distance_int8(), brin_minmax_multi_distance_numeric(), brin_minmax_multi_distance_uuid(), build_distances(), cmpaffix(), deccall2(), deccall3(), evalLazyFunc(), inet_merge(), inet_same_family(), int4gcd_internal(), int8gcd_internal(), macaddr8_cmp(), macaddr8_eq(), macaddr8_ge(), macaddr8_gt(), macaddr8_le(), macaddr8_lt(),