paramassign.c File Reference

#include "postgres.h"
#include "nodes/nodeFuncs.h"
#include "nodes/plannodes.h"
#include "optimizer/paramassign.h"
#include "optimizer/placeholder.h"
#include "rewrite/rewriteManip.h"

Include dependency graph for paramassign.c:

Go to the source code of this file.

Functions
static int	assign_param_for_var (PlannerInfo *root, Var *var)
Param *	replace_outer_var (PlannerInfo *root, Var *var)
static int	assign_param_for_placeholdervar (PlannerInfo *root, PlaceHolderVar *phv)
Param *	replace_outer_placeholdervar (PlannerInfo *root, PlaceHolderVar *phv)
Param *	replace_outer_agg (PlannerInfo *root, Aggref *agg)
Param *	replace_outer_grouping (PlannerInfo *root, GroupingFunc *grp)
Param *	replace_nestloop_param_var (PlannerInfo *root, Var *var)
Param *	replace_nestloop_param_placeholdervar (PlannerInfo *root, PlaceHolderVar *phv)
void	process_subquery_nestloop_params (PlannerInfo *root, List *subplan_params)
List *	identify_current_nestloop_params (PlannerInfo *root, Relids leftrelids)
Param *	generate_new_exec_param (PlannerInfo *root, Oid paramtype, int32 paramtypmod, Oid paramcollation)
int	assign_special_exec_param (PlannerInfo *root)

Function Documentation

assign_param_for_placeholdervar()

static int assign_param_for_placeholdervar ( PlannerInfo *  root, PlaceHolderVar *  phv  )

static

Definition at line 148 of file paramassign.c.

{
    ListCell   *ppl;
    PlannerParamItem *pitem;
    Index       levelsup;
 
    /* Find the query level the PHV belongs to */
    for (levelsup = phv->phlevelsup; levelsup > 0; levelsup--)
        root = root->parent_root;
 
    /* If there's already a matching PlannerParamItem there, just use it */
    foreach(ppl, root->plan_params)
    {
        pitem = (PlannerParamItem *) lfirst(ppl);
        if (IsA(pitem->item, PlaceHolderVar))
        {
            PlaceHolderVar *pphv = (PlaceHolderVar *) pitem->item;
 
            /* We assume comparing the PHIDs is sufficient */
            if (pphv->phid == phv->phid)
                return pitem->paramId;
        }
    }
 
    /* Nope, so make a new one */
    phv = copyObject(phv);
    IncrementVarSublevelsUp((Node *) phv, -((int) phv->phlevelsup), 0);
    Assert(phv->phlevelsup == 0);
 
    pitem = makeNode(PlannerParamItem);
    pitem->item = (Node *) phv;
    pitem->paramId = list_length(root->glob->paramExecTypes);
    root->glob->paramExecTypes = lappend_oid(root->glob->paramExecTypes,
                                             exprType((Node *) phv->phexpr));
 
    root->plan_params = lappend(root->plan_params, pitem);
 
    return pitem->paramId;
}

References Assert(), copyObject, exprType(), PlannerInfo::glob, if(), IncrementVarSublevelsUp(), IsA, PlannerParamItem::item, lappend(), lappend_oid(), lfirst, list_length(), makeNode, PlannerGlobal::paramExecTypes, PlannerParamItem::paramId, PlaceHolderVar::phid, PlaceHolderVar::phlevelsup, and PlannerInfo::plan_params.

Referenced by replace_outer_placeholdervar().

assign_param_for_var()

static int assign_param_for_var ( PlannerInfo *  root, Var *  var  )

static

Definition at line 66 of file paramassign.c.

{
    ListCell   *ppl;
    PlannerParamItem *pitem;
    Index       levelsup;
 
    /* Find the query level the Var belongs to */
    for (levelsup = var->varlevelsup; levelsup > 0; levelsup--)
        root = root->parent_root;
 
    /* If there's already a matching PlannerParamItem there, just use it */
    foreach(ppl, root->plan_params)
    {
        pitem = (PlannerParamItem *) lfirst(ppl);
        if (IsA(pitem->item, Var))
        {
            Var        *pvar = (Var *) pitem->item;
 
            /*
             * This comparison must match _equalVar(), except for ignoring
             * varlevelsup.  Note that _equalVar() ignores varnosyn,
             * varattnosyn, and location, so this does too.
             */
            if (pvar->varno == var->varno &&
                pvar->varattno == var->varattno &&
                pvar->vartype == var->vartype &&
                pvar->vartypmod == var->vartypmod &&
                pvar->varcollid == var->varcollid)
                return pitem->paramId;
        }
    }
 
    /* Nope, so make a new one */
    var = copyObject(var);
    var->varlevelsup = 0;
 
    pitem = makeNode(PlannerParamItem);
    pitem->item = (Node *) var;
    pitem->paramId = list_length(root->glob->paramExecTypes);
    root->glob->paramExecTypes = lappend_oid(root->glob->paramExecTypes,
                                             var->vartype);
 
    root->plan_params = lappend(root->plan_params, pitem);
 
    return pitem->paramId;
}

References copyObject, PlannerInfo::glob, if(), IsA, PlannerParamItem::item, lappend(), lappend_oid(), lfirst, list_length(), makeNode, PlannerGlobal::paramExecTypes, PlannerParamItem::paramId, PlannerInfo::plan_params, Var::varattno, Var::varlevelsup, and Var::varno.

Referenced by replace_outer_var().

assign_special_exec_param()

int assign_special_exec_param

(

PlannerInfo *

root

)

Definition at line 580 of file paramassign.c.

{
    int         paramId = list_length(root->glob->paramExecTypes);
 
    root->glob->paramExecTypes = lappend_oid(root->glob->paramExecTypes,
                                             InvalidOid);
    return paramId;
}

References PlannerInfo::glob, InvalidOid, lappend_oid(), list_length(), and PlannerGlobal::paramExecTypes.

Referenced by create_gather_merge_plan(), create_gather_plan(), grouping_planner(), SS_process_ctes(), and subquery_planner().

generate_new_exec_param()

Param* generate_new_exec_param	(	PlannerInfo *	root,
		Oid	paramtype,
		int32	paramtypmod,
		Oid	paramcollation
	)

Definition at line 553 of file paramassign.c.

{
    Param      *retval;
 
    retval = makeNode(Param);
    retval->paramkind = PARAM_EXEC;
    retval->paramid = list_length(root->glob->paramExecTypes);
    root->glob->paramExecTypes = lappend_oid(root->glob->paramExecTypes,
                                             paramtype);
    retval->paramtype = paramtype;
    retval->paramtypmod = paramtypmod;
    retval->paramcollid = paramcollation;
    retval->location = -1;
 
    return retval;
}

References PlannerInfo::glob, lappend_oid(), list_length(), Param::location, makeNode, PARAM_EXEC, PlannerGlobal::paramExecTypes, Param::paramid, Param::paramkind, and Param::paramtype.

Referenced by build_subplan(), convert_EXISTS_to_ANY(), generate_subquery_params(), replace_nestloop_param_placeholdervar(), replace_nestloop_param_var(), and SS_make_initplan_output_param().

identify_current_nestloop_params()

List* identify_current_nestloop_params	(	PlannerInfo *	root,
		Relids	leftrelids
	)

Definition at line 508 of file paramassign.c.

{
    List       *result;
    ListCell   *cell;
 
    result = NIL;
    foreach(cell, root->curOuterParams)
    {
        NestLoopParam *nlp = (NestLoopParam *) lfirst(cell);
 
        /*
         * We are looking for Vars and PHVs that can be supplied by the
         * lefthand rels.
         */
        if (IsA(nlp->paramval, Var) &&
            bms_is_member(nlp->paramval->varno, leftrelids))
        {
            root->curOuterParams = foreach_delete_current(root->curOuterParams,
                                                          cell);
            result = lappend(result, nlp);
        }
        else if (IsA(nlp->paramval, PlaceHolderVar) &&
                 bms_is_subset(find_placeholder_info(root,
                                                     (PlaceHolderVar *) nlp->paramval)->ph_eval_at,
                               leftrelids))
        {
            root->curOuterParams = foreach_delete_current(root->curOuterParams,
                                                          cell);
            result = lappend(result, nlp);
        }
    }
    return result;
}

References bms_is_member(), bms_is_subset(), PlannerInfo::curOuterParams, find_placeholder_info(), foreach_delete_current, IsA, lappend(), lfirst, NIL, NestLoopParam::paramval, PlaceHolderInfo::ph_eval_at, and Var::varno.

Referenced by create_nestloop_plan().

process_subquery_nestloop_params()

void process_subquery_nestloop_params	(	PlannerInfo *	root,
		List *	subplan_params
	)

Definition at line 428 of file paramassign.c.

{
    ListCell   *lc;
 
    foreach(lc, subplan_params)
    {
        PlannerParamItem *pitem = lfirst_node(PlannerParamItem, lc);
 
        if (IsA(pitem->item, Var))
        {
            Var        *var = (Var *) pitem->item;
            NestLoopParam *nlp;
            ListCell   *lc2;
 
            /* If not from a nestloop outer rel, complain */
            if (!bms_is_member(var->varno, root->curOuterRels))
                elog(ERROR, "non-LATERAL parameter required by subquery");
 
            /* Is this param already listed in root->curOuterParams? */
            foreach(lc2, root->curOuterParams)
            {
                nlp = (NestLoopParam *) lfirst(lc2);
                if (nlp->paramno == pitem->paramId)
                {
                    Assert(equal(var, nlp->paramval));
                    /* Present, so nothing to do */
                    break;
                }
            }
            if (lc2 == NULL)
            {
                /* No, so add it */
                nlp = makeNode(NestLoopParam);
                nlp->paramno = pitem->paramId;
                nlp->paramval = copyObject(var);
                root->curOuterParams = lappend(root->curOuterParams, nlp);
            }
        }
        else if (IsA(pitem->item, PlaceHolderVar))
        {
            PlaceHolderVar *phv = (PlaceHolderVar *) pitem->item;
            NestLoopParam *nlp;
            ListCell   *lc2;
 
            /* If not from a nestloop outer rel, complain */
            if (!bms_is_subset(find_placeholder_info(root, phv)->ph_eval_at,
                               root->curOuterRels))
                elog(ERROR, "non-LATERAL parameter required by subquery");
 
            /* Is this param already listed in root->curOuterParams? */
            foreach(lc2, root->curOuterParams)
            {
                nlp = (NestLoopParam *) lfirst(lc2);
                if (nlp->paramno == pitem->paramId)
                {
                    Assert(equal(phv, nlp->paramval));
                    /* Present, so nothing to do */
                    break;
                }
            }
            if (lc2 == NULL)
            {
                /* No, so add it */
                nlp = makeNode(NestLoopParam);
                nlp->paramno = pitem->paramId;
                nlp->paramval = (Var *) copyObject(phv);
                root->curOuterParams = lappend(root->curOuterParams, nlp);
            }
        }
        else
            elog(ERROR, "unexpected type of subquery parameter");
    }
}

References Assert(), bms_is_member(), bms_is_subset(), copyObject, PlannerInfo::curOuterParams, PlannerInfo::curOuterRels, elog(), equal(), ERROR, find_placeholder_info(), if(), IsA, PlannerParamItem::item, lappend(), lfirst, lfirst_node, makeNode, PlannerParamItem::paramId, and Var::varno.

Referenced by create_subqueryscan_plan().

replace_nestloop_param_placeholdervar()

Param* replace_nestloop_param_placeholdervar	(	PlannerInfo *	root,
		PlaceHolderVar *	phv
	)

Definition at line 364 of file paramassign.c.

{
    Param      *param;
    NestLoopParam *nlp;
    ListCell   *lc;
 
    /* Is this PHV already listed in root->curOuterParams? */
    foreach(lc, root->curOuterParams)
    {
        nlp = (NestLoopParam *) lfirst(lc);
        if (equal(phv, nlp->paramval))
        {
            /* Yes, so just make a Param referencing this NLP's slot */
            param = makeNode(Param);
            param->paramkind = PARAM_EXEC;
            param->paramid = nlp->paramno;
            param->paramtype = exprType((Node *) phv->phexpr);
            param->paramtypmod = exprTypmod((Node *) phv->phexpr);
            param->paramcollid = exprCollation((Node *) phv->phexpr);
            param->location = -1;
            return param;
        }
    }
 
    /* No, so assign a PARAM_EXEC slot for a new NLP */
    param = generate_new_exec_param(root,
                                    exprType((Node *) phv->phexpr),
                                    exprTypmod((Node *) phv->phexpr),
                                    exprCollation((Node *) phv->phexpr));
 
    /* Add it to the list of required NLPs */
    nlp = makeNode(NestLoopParam);
    nlp->paramno = param->paramid;
    nlp->paramval = (Var *) copyObject(phv);
    root->curOuterParams = lappend(root->curOuterParams, nlp);
 
    /* And return the replacement Param */
    return param;
}

References copyObject, PlannerInfo::curOuterParams, equal(), exprCollation(), exprType(), exprTypmod(), generate_new_exec_param(), lappend(), lfirst, Param::location, makeNode, PARAM_EXEC, Param::paramid, Param::paramkind, NestLoopParam::paramno, Param::paramtype, and NestLoopParam::paramval.

Referenced by replace_nestloop_params_mutator().

replace_nestloop_param_var()

Param* replace_nestloop_param_var	(	PlannerInfo *	root,
		Var *	var
	)

Definition at line 315 of file paramassign.c.

{
    Param      *param;
    NestLoopParam *nlp;
    ListCell   *lc;
 
    /* Is this Var already listed in root->curOuterParams? */
    foreach(lc, root->curOuterParams)
    {
        nlp = (NestLoopParam *) lfirst(lc);
        if (equal(var, nlp->paramval))
        {
            /* Yes, so just make a Param referencing this NLP's slot */
            param = makeNode(Param);
            param->paramkind = PARAM_EXEC;
            param->paramid = nlp->paramno;
            param->paramtype = var->vartype;
            param->paramtypmod = var->vartypmod;
            param->paramcollid = var->varcollid;
            param->location = var->location;
            return param;
        }
    }
 
    /* No, so assign a PARAM_EXEC slot for a new NLP */
    param = generate_new_exec_param(root,
                                    var->vartype,
                                    var->vartypmod,
                                    var->varcollid);
    param->location = var->location;
 
    /* Add it to the list of required NLPs */
    nlp = makeNode(NestLoopParam);
    nlp->paramno = param->paramid;
    nlp->paramval = copyObject(var);
    root->curOuterParams = lappend(root->curOuterParams, nlp);
 
    /* And return the replacement Param */
    return param;
}

References copyObject, PlannerInfo::curOuterParams, equal(), generate_new_exec_param(), lappend(), lfirst, Var::location, Param::location, makeNode, PARAM_EXEC, Param::paramid, Param::paramkind, NestLoopParam::paramno, Param::paramtype, and NestLoopParam::paramval.

Referenced by replace_nestloop_params_mutator().

replace_outer_agg()

Param* replace_outer_agg	(	PlannerInfo *	root,
		Aggref *	agg
	)

Definition at line 223 of file paramassign.c.

{
    Param      *retval;
    PlannerParamItem *pitem;
    Index       levelsup;
 
    Assert(agg->agglevelsup > 0 && agg->agglevelsup < root->query_level);
 
    /* Find the query level the Aggref belongs to */
    for (levelsup = agg->agglevelsup; levelsup > 0; levelsup--)
        root = root->parent_root;
 
    /*
     * It does not seem worthwhile to try to de-duplicate references to outer
     * aggs.  Just make a new slot every time.
     */
    agg = copyObject(agg);
    IncrementVarSublevelsUp((Node *) agg, -((int) agg->agglevelsup), 0);
    Assert(agg->agglevelsup == 0);
 
    pitem = makeNode(PlannerParamItem);
    pitem->item = (Node *) agg;
    pitem->paramId = list_length(root->glob->paramExecTypes);
    root->glob->paramExecTypes = lappend_oid(root->glob->paramExecTypes,
                                             agg->aggtype);
 
    root->plan_params = lappend(root->plan_params, pitem);
 
    retval = makeNode(Param);
    retval->paramkind = PARAM_EXEC;
    retval->paramid = pitem->paramId;
    retval->paramtype = agg->aggtype;
    retval->paramtypmod = -1;
    retval->paramcollid = agg->aggcollid;
    retval->location = agg->location;
 
    return retval;
}

References Assert(), copyObject, PlannerInfo::glob, IncrementVarSublevelsUp(), PlannerParamItem::item, lappend(), lappend_oid(), list_length(), Param::location, Aggref::location, makeNode, PARAM_EXEC, PlannerGlobal::paramExecTypes, PlannerParamItem::paramId, Param::paramid, Param::paramkind, Param::paramtype, PlannerInfo::plan_params, and PlannerInfo::query_level.

Referenced by replace_correlation_vars_mutator().

replace_outer_grouping()

Param* replace_outer_grouping	(	PlannerInfo *	root,
		GroupingFunc *	grp
	)

Definition at line 269 of file paramassign.c.

{
    Param      *retval;
    PlannerParamItem *pitem;
    Index       levelsup;
    Oid         ptype = exprType((Node *) grp);
 
    Assert(grp->agglevelsup > 0 && grp->agglevelsup < root->query_level);
 
    /* Find the query level the GroupingFunc belongs to */
    for (levelsup = grp->agglevelsup; levelsup > 0; levelsup--)
        root = root->parent_root;
 
    /*
     * It does not seem worthwhile to try to de-duplicate references to outer
     * aggs.  Just make a new slot every time.
     */
    grp = copyObject(grp);
    IncrementVarSublevelsUp((Node *) grp, -((int) grp->agglevelsup), 0);
    Assert(grp->agglevelsup == 0);
 
    pitem = makeNode(PlannerParamItem);
    pitem->item = (Node *) grp;
    pitem->paramId = list_length(root->glob->paramExecTypes);
    root->glob->paramExecTypes = lappend_oid(root->glob->paramExecTypes,
                                             ptype);
 
    root->plan_params = lappend(root->plan_params, pitem);
 
    retval = makeNode(Param);
    retval->paramkind = PARAM_EXEC;
    retval->paramid = pitem->paramId;
    retval->paramtype = ptype;
    retval->paramtypmod = -1;
    retval->paramcollid = InvalidOid;
    retval->location = grp->location;
 
    return retval;
}

References GroupingFunc::agglevelsup, Assert(), copyObject, exprType(), PlannerInfo::glob, IncrementVarSublevelsUp(), InvalidOid, PlannerParamItem::item, lappend(), lappend_oid(), list_length(), Param::location, GroupingFunc::location, makeNode, PARAM_EXEC, PlannerGlobal::paramExecTypes, PlannerParamItem::paramId, Param::paramid, Param::paramkind, Param::paramtype, PlannerInfo::plan_params, and PlannerInfo::query_level.

Referenced by replace_correlation_vars_mutator().

replace_outer_placeholdervar()

Param* replace_outer_placeholdervar	(	PlannerInfo *	root,
		PlaceHolderVar *	phv
	)

Definition at line 196 of file paramassign.c.

{
    Param      *retval;
    int         i;
 
    Assert(phv->phlevelsup > 0 && phv->phlevelsup < root->query_level);
 
    /* Find the PHV in the appropriate plan_params, or add it if not present */
    i = assign_param_for_placeholdervar(root, phv);
 
    retval = makeNode(Param);
    retval->paramkind = PARAM_EXEC;
    retval->paramid = i;
    retval->paramtype = exprType((Node *) phv->phexpr);
    retval->paramtypmod = exprTypmod((Node *) phv->phexpr);
    retval->paramcollid = exprCollation((Node *) phv->phexpr);
    retval->location = -1;
 
    return retval;
}

References Assert(), assign_param_for_placeholdervar(), exprCollation(), exprType(), exprTypmod(), i, Param::location, makeNode, PARAM_EXEC, Param::paramid, Param::paramkind, Param::paramtype, PlaceHolderVar::phlevelsup, and PlannerInfo::query_level.

Referenced by replace_correlation_vars_mutator().

replace_outer_var()

Param* replace_outer_var	(	PlannerInfo *	root,
		Var *	var
	)

Definition at line 119 of file paramassign.c.

{
    Param      *retval;
    int         i;
 
    Assert(var->varlevelsup > 0 && var->varlevelsup < root->query_level);
 
    /* Find the Var in the appropriate plan_params, or add it if not present */
    i = assign_param_for_var(root, var);
 
    retval = makeNode(Param);
    retval->paramkind = PARAM_EXEC;
    retval->paramid = i;
    retval->paramtype = var->vartype;
    retval->paramtypmod = var->vartypmod;
    retval->paramcollid = var->varcollid;
    retval->location = var->location;
 
    return retval;
}

References Assert(), assign_param_for_var(), i, Var::location, Param::location, makeNode, PARAM_EXEC, Param::paramid, Param::paramkind, Param::paramtype, PlannerInfo::query_level, and Var::varlevelsup.

Referenced by replace_correlation_vars_mutator().