parsetree.h File Reference

#include "nodes/parsenodes.h"

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Macros
#define	rt_fetch(rangetable_index, rangetable)    ((RangeTblEntry *) list_nth(rangetable, (rangetable_index)-1))

Functions
char *	get_rte_attribute_name (RangeTblEntry *rte, AttrNumber attnum)
bool	get_rte_attribute_is_dropped (RangeTblEntry *rte, AttrNumber attnum)
TargetEntry *	get_tle_by_resno (List *tlist, AttrNumber resno)
RowMarkClause *	get_parse_rowmark (Query *qry, Index rtindex)

Macro Definition Documentation

rt_fetch

#define rt_fetch	(		rangetable_index,
			rangetable
	)		((RangeTblEntry *) list_nth(rangetable, (rangetable_index)-1))

Definition at line 31 of file parsetree.h.

Function Documentation

get_parse_rowmark()

RowMarkClause * get_parse_rowmark	(	Query *	qry,
		Index	rtindex
	)

Definition at line 3565 of file parse_relation.c.

{
    ListCell   *l;
 
    foreach(l, qry->rowMarks)
    {
        RowMarkClause *rc = (RowMarkClause *) lfirst(l);
 
        if (rc->rti == rtindex)
            return rc;
    }
    return NULL;
}

References lfirst, Query::rowMarks, and RowMarkClause::rti.

Referenced by AcquireRewriteLocks(), applyLockingClause(), and ApplyRetrieveRule().

get_rte_attribute_is_dropped()

bool get_rte_attribute_is_dropped	(	RangeTblEntry *	rte,
		AttrNumber	attnum
	)

Definition at line 3396 of file parse_relation.c.

{
    bool        result;
 
    switch (rte->rtekind)
    {
        case RTE_RELATION:
            {
                /*
                 * Plain relation RTE --- get the attribute's catalog entry
                 */
                HeapTuple   tp;
                Form_pg_attribute att_tup;
 
                tp = SearchSysCache2(ATTNUM,
                                     ObjectIdGetDatum(rte->relid),
                                     Int16GetDatum(attnum));
                if (!HeapTupleIsValid(tp))  /* shouldn't happen */
                    elog(ERROR, "cache lookup failed for attribute %d of relation %u",
                         attnum, rte->relid);
                att_tup = (Form_pg_attribute) GETSTRUCT(tp);
                result = att_tup->attisdropped;
                ReleaseSysCache(tp);
            }
            break;
        case RTE_SUBQUERY:
        case RTE_TABLEFUNC:
        case RTE_VALUES:
        case RTE_CTE:
        case RTE_GROUP:
 
            /*
             * Subselect, Table Functions, Values, CTE, GROUP RTEs never have
             * dropped columns
             */
            result = false;
            break;
        case RTE_NAMEDTUPLESTORE:
            {
                /* Check dropped-ness by testing for valid coltype */
                if (attnum <= 0 ||
                    attnum > list_length(rte->coltypes))
                    elog(ERROR, "invalid varattno %d", attnum);
                result = !OidIsValid((list_nth_oid(rte->coltypes, attnum - 1)));
            }
            break;
        case RTE_JOIN:
            {
                /*
                 * A join RTE would not have dropped columns when constructed,
                 * but one in a stored rule might contain columns that were
                 * dropped from the underlying tables, if said columns are
                 * nowhere explicitly referenced in the rule.  This will be
                 * signaled to us by a null pointer in the joinaliasvars list.
                 */
                Var        *aliasvar;
 
                if (attnum <= 0 ||
                    attnum > list_length(rte->joinaliasvars))
                    elog(ERROR, "invalid varattno %d", attnum);
                aliasvar = (Var *) list_nth(rte->joinaliasvars, attnum - 1);
 
                result = (aliasvar == NULL);
            }
            break;
        case RTE_FUNCTION:
            {
                /* Function RTE */
                ListCell   *lc;
                int         atts_done = 0;
 
                /*
                 * Dropped attributes are only possible with functions that
                 * return named composite types.  In such a case we have to
                 * look up the result type to see if it currently has this
                 * column dropped.  So first, loop over the funcs until we
                 * find the one that covers the requested column.
                 */
                foreach(lc, rte->functions)
                {
                    RangeTblFunction *rtfunc = (RangeTblFunction *) lfirst(lc);
 
                    if (attnum > atts_done &&
                        attnum <= atts_done + rtfunc->funccolcount)
                    {
                        TupleDesc   tupdesc;
 
                        /* If it has a coldeflist, it returns RECORD */
                        if (rtfunc->funccolnames != NIL)
                            return false;   /* can't have any dropped columns */
 
                        tupdesc = get_expr_result_tupdesc(rtfunc->funcexpr,
                                                          true);
                        if (tupdesc)
                        {
                            /* Composite data type, e.g. a table's row type */
                            Form_pg_attribute att_tup;
 
                            Assert(tupdesc);
                            Assert(attnum - atts_done <= tupdesc->natts);
                            att_tup = TupleDescAttr(tupdesc,
                                                    attnum - atts_done - 1);
                            return att_tup->attisdropped;
                        }
                        /* Otherwise, it can't have any dropped columns */
                        return false;
                    }
                    atts_done += rtfunc->funccolcount;
                }
 
                /* If we get here, must be looking for the ordinality column */
                if (rte->funcordinality && attnum == atts_done + 1)
                    return false;
 
                /* this probably can't happen ... */
                ereport(ERROR,
                        (errcode(ERRCODE_UNDEFINED_COLUMN),
                         errmsg("column %d of relation \"%s\" does not exist",
                                attnum,
                                rte->eref->aliasname)));
                result = false; /* keep compiler quiet */
            }
            break;
        case RTE_RESULT:
            /* this probably can't happen ... */
            ereport(ERROR,
                    (errcode(ERRCODE_UNDEFINED_COLUMN),
                     errmsg("column %d of relation \"%s\" does not exist",
                            attnum,
                            rte->eref->aliasname)));
            result = false;     /* keep compiler quiet */
            break;
        default:
            elog(ERROR, "unrecognized RTE kind: %d", (int) rte->rtekind);
            result = false;     /* keep compiler quiet */
    }
 
    return result;
}

References Assert(), attnum, elog, ereport, errcode(), errmsg(), ERROR, RangeTblFunction::funcexpr, RangeTblEntry::funcordinality, RangeTblEntry::functions, get_expr_result_tupdesc(), GETSTRUCT(), HeapTupleIsValid, Int16GetDatum(), lfirst, list_length(), list_nth(), list_nth_oid(), NIL, ObjectIdGetDatum(), OidIsValid, ReleaseSysCache(), RTE_CTE, RTE_FUNCTION, RTE_GROUP, RTE_JOIN, RTE_NAMEDTUPLESTORE, RTE_RELATION, RTE_RESULT, RTE_SUBQUERY, RTE_TABLEFUNC, RTE_VALUES, RangeTblEntry::rtekind, SearchSysCache2(), and TupleDescAttr().

Referenced by AcquireRewriteLocks().

get_rte_attribute_name()

char * get_rte_attribute_name	(	RangeTblEntry *	rte,
		AttrNumber	attnum
	)

Definition at line 3358 of file parse_relation.c.

{
    if (attnum == InvalidAttrNumber)
        return "*";
 
    /*
     * If there is a user-written column alias, use it.
     */
    if (rte->alias &&
        attnum > 0 && attnum <= list_length(rte->alias->colnames))
        return strVal(list_nth(rte->alias->colnames, attnum - 1));
 
    /*
     * If the RTE is a relation, go to the system catalogs not the
     * eref->colnames list.  This is a little slower but it will give the
     * right answer if the column has been renamed since the eref list was
     * built (which can easily happen for rules).
     */
    if (rte->rtekind == RTE_RELATION)
        return get_attname(rte->relid, attnum, false);
 
    /*
     * Otherwise use the column name from eref.  There should always be one.
     */
    if (attnum > 0 && attnum <= list_length(rte->eref->colnames))
        return strVal(list_nth(rte->eref->colnames, attnum - 1));
 
    /* else caller gave us a bogus attnum */
    elog(ERROR, "invalid attnum %d for rangetable entry %s",
         attnum, rte->eref->aliasname);
    return NULL;                /* keep compiler quiet */
}

References attnum, elog, ERROR, get_attname(), InvalidAttrNumber, list_length(), list_nth(), RTE_RELATION, RangeTblEntry::rtekind, and strVal.

Referenced by get_name_for_var_field(), get_variable(), print_expr(), and substitute_grouped_columns_mutator().

get_tle_by_resno()

TargetEntry * get_tle_by_resno	(	List *	tlist,
		AttrNumber	resno
	)

Definition at line 3545 of file parse_relation.c.

{
    ListCell   *l;
 
    foreach(l, tlist)
    {
        TargetEntry *tle = (TargetEntry *) lfirst(l);
 
        if (tle->resno == resno)
            return tle;
    }
    return NULL;
}

References lfirst, and TargetEntry::resno.

Referenced by adjust_view_column_set(), count_rowexpr_columns(), create_unique_plan(), currtid_for_view(), examine_simple_variable(), expandRecordVariable(), get_name_for_var_field(), get_variable(), make_sort_from_groupcols(), markTargetListOrigin(), prepare_sort_from_pathkeys(), ReplaceVarFromTargetList(), resolve_special_varno(), rewriteTargetView(), show_grouping_set_keys(), show_sort_group_keys(), and show_window_keys().