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Revise union_planner and associated routines to clean up breakage

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from EXCEPT/HAVING patch.  Cases involving nontrivial GROUP BY expressions
now work again.  Also, the code is at least somewhat better documented...
This commit is contained in:
Tom Lane 1999-05-03 00:38:44 +00:00
parent 605d84941d
commit da5f1dd722
5 changed files with 577 additions and 571 deletions
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226
src/backend/optimizer/plan/planmain.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planmain.c,v 1.34 1999/02/21 03:48:49 scrappy Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planmain.c,v 1.35 1999/05/03 00:38:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -44,9 +44,6 @@
static Plan *subplanner(Query *root, List *flat_tlist, List *qual);
static Result *make_result(List *tlist, Node *resconstantqual, Plan *subplan);
extern Plan *make_groupPlan(List **tlist, bool tuplePerGroup,
List *groupClause, Plan *subplan);
/*
* query_planner
* Routine to create a query plan. It does so by first creating a
@ -177,18 +174,14 @@ query_planner(Query *root,
*/
if (constant_qual)
{
subplan = (Plan *) make_result((!root->hasAggs &&
!root->groupClause &&
!root->havingQual)
? tlist : subplan->targetlist,
subplan = (Plan *) make_result(tlist,
(Node *) constant_qual,
subplan);
/*
* Change all varno's of the Result's node target list.
* Fix all varno's of the Result's node target list.
*/
if (!root->hasAggs && !root->groupClause && !root->havingQual)
set_tlist_references(subplan);
set_tlist_references(subplan);
return subplan;
}
@ -201,16 +194,15 @@ query_planner(Query *root,
* responsibility to optimally push these expressions down the plan
* tree. -- Wei
*
* But now nothing to do if there are GroupBy and/or Aggregates: 1.
* make_groupPlan fixes tlist; 2. flatten_tlist_vars does nothing with
* aggregates fixing only other entries (i.e. - GroupBy-ed and so
* fixed by make_groupPlan). - vadim 04/05/97
* Note: formerly there was a test here to skip the flatten call if we
* expected union_planner to insert a Group or Agg node above our result.
* However, now union_planner tells us exactly what it wants returned,
* and we just do it. Much cleaner.
*/
else
{
if (!root->hasAggs && !root->groupClause && !root->havingQual)
subplan->targetlist = flatten_tlist_vars(tlist,
subplan->targetlist);
subplan->targetlist = flatten_tlist_vars(tlist,
subplan->targetlist);
return subplan;
}
@ -321,201 +313,3 @@ make_result(List *tlist,
return node;
}
/*****************************************************************************
*
*****************************************************************************/
Plan *
make_groupPlan(List **tlist,
bool tuplePerGroup,
List *groupClause,
Plan *subplan)
{
List *sort_tlist;
List *sl,
*gl;
List *glc = listCopy(groupClause);
List *otles = NIL; /* list of removed non-GroupBy entries */
List *otlvars = NIL; /* list of var in them */
int otlvcnt;
Sort *sortplan;
Group *grpplan;
int numCols;
AttrNumber *grpColIdx;
int last_resno = 1;
numCols = length(groupClause);
grpColIdx = (AttrNumber *) palloc(sizeof(AttrNumber) * numCols);
sort_tlist = new_unsorted_tlist(*tlist); /* it's copy */
/*
* Make template TL for subplan, Sort & Group: 1. If there are
* aggregates (tuplePerGroup is true) then take away non-GroupBy
* entries and re-set resno-s accordantly. 2. Make grpColIdx
*
* Note: we assume that TLEs in *tlist are ordered in accordance with
* their resdom->resno.
*/
foreach(sl, sort_tlist)
{
Resdom *resdom = NULL;
TargetEntry *te = (TargetEntry *) lfirst(sl);
int keyno = 0;
foreach(gl, groupClause)
{
GroupClause *grpcl = (GroupClause *) lfirst(gl);
keyno++;
if (grpcl->entry->resdom->resno == te->resdom->resno)
{
resdom = te->resdom;
resdom->reskey = keyno;
resdom->reskeyop = get_opcode(grpcl->grpOpoid);
resdom->resno = last_resno; /* re-set */
grpColIdx[keyno - 1] = last_resno++;
glc = lremove(lfirst(gl), glc); /* TLE found for it */
break;
}
}
/*
* Non-GroupBy entry: remove it from Group/Sort TL if there are
* aggregates in query - it will be evaluated by Aggregate plan
*/
if (resdom == NULL)
{
if (tuplePerGroup)
{
otlvars = nconc(otlvars, pull_var_clause(te->expr));
otles = lcons(te, otles);
sort_tlist = lremove(te, sort_tlist);
}
else
te->resdom->resno = last_resno++;
}
}
if (length(glc) != 0)
elog(ERROR, "group attribute disappeared from target list");
/*
* If non-GroupBy entries were removed from TL - we are to add Vars
* for them to the end of TL if there are no such Vars in TL already.
*/
otlvcnt = length(otlvars);
foreach(gl, otlvars)
{
Var *v = (Var *) lfirst(gl);
if (tlist_member(v, sort_tlist) == NULL)
{
sort_tlist = lappend(sort_tlist,
create_tl_element(v, last_resno));
last_resno++;
}
else
/* already in TL */
otlvcnt--;
}
/* Now otlvcnt is number of Vars added in TL for non-GroupBy entries */
/* Make TL for subplan: substitute Vars from subplan TL into new TL */
sl = flatten_tlist_vars(sort_tlist, subplan->targetlist);
subplan->targetlist = new_unsorted_tlist(sl); /* there */
/*
* Make Sort/Group TL : 1. make Var nodes (with varno = 1 and varnoold
* = -1) for all functions, 'couse they will be evaluated by subplan;
* 2. for real Vars: set varno = 1 and varattno to its resno in
* subplan
*/
foreach(sl, sort_tlist)
{
TargetEntry *te = (TargetEntry *) lfirst(sl);
Resdom *resdom = te->resdom;
Node *expr = te->expr;
if (IsA(expr, Var))
{
#ifdef NOT_USED /* subplanVar->resdom->resno expected to
* be = te->resdom->resno */
TargetEntry *subplanVar;
subplanVar = match_varid((Var *) expr, subplan->targetlist);
((Var *) expr)->varattno = subplanVar->resdom->resno;
#endif
((Var *) expr)->varattno = te->resdom->resno;
((Var *) expr)->varno = 1;
}
else
te->expr = (Node *) makeVar(1, resdom->resno,
resdom->restype,
resdom->restypmod,
0, -1, resdom->resno);
}
sortplan = make_sort(sort_tlist,
_NONAME_RELATION_ID_,
subplan,
numCols);
sortplan->plan.cost = subplan->cost; /* XXX assume no cost */
/*
* make the Group node
*/
sort_tlist = copyObject(sort_tlist);
grpplan = make_group(sort_tlist, tuplePerGroup, numCols,
grpColIdx, sortplan);
/*
* Make TL for parent: "restore" non-GroupBy entries (if they were
* removed) and set resno-s of others accordantly.
*/
sl = sort_tlist;
sort_tlist = NIL; /* to be new parent TL */
foreach(gl, *tlist)
{
List *temp = NIL;
TargetEntry *te = (TargetEntry *) lfirst(gl);
foreach(temp, otles) /* Is it removed non-GroupBy entry ? */
{
TargetEntry *ote = (TargetEntry *) lfirst(temp);
if (ote->resdom->resno == te->resdom->resno)
{
otles = lremove(ote, otles);
break;
}
}
if (temp == NIL) /* It's "our" TLE - we're to return */
{ /* it from Sort/Group plans */
TargetEntry *my = (TargetEntry *) lfirst(sl); /* get it */
sl = sl->next; /* prepare for the next "our" */
my = copyObject(my);
my->resdom->resno = te->resdom->resno; /* order of parent TL */
sort_tlist = lappend(sort_tlist, my);
continue;
}
/* else - it's TLE of an non-GroupBy entry */
sort_tlist = lappend(sort_tlist, copyObject(te));
}
/*
* Pure non-GroupBy entries Vars were at the end of Group' TL. They
* shouldn't appear in parent TL, all others shouldn't disappear.
*/
Assert(otlvcnt == length(sl));
Assert(length(otles) == 0);
*tlist = sort_tlist;
return (Plan *) grpplan;
}

390
src/backend/optimizer/plan/planner.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.47 1999/04/19 01:43:11 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/planner.c,v 1.48 1999/05/03 00:38:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -55,10 +55,13 @@
#include "access/genam.h"
#include "parser/parse_oper.h"
static List *make_subplanTargetList(Query *parse, List *tlist,
AttrNumber **groupColIdx);
static Plan *make_groupplan(List *group_tlist, bool tuplePerGroup,
List *groupClause, AttrNumber *grpColIdx,
Plan *subplan);
static bool need_sortplan(List *sortcls, Plan *plan);
static Plan *make_sortplan(List *tlist, List *sortcls, Plan *plannode);
extern Plan *make_groupPlan(List **tlist, bool tuplePerGroup,
List *groupClause, Plan *subplan);
/*****************************************************************************
*
@ -103,16 +106,9 @@ Plan *
union_planner(Query *parse)
{
List *tlist = parse->targetList;
/***S*H***/
/* copy the original tlist, we will need the original one
* for the AGG node later on */
List *new_tlist = new_unsorted_tlist(tlist);
List *rangetable = parse->rtable;
Plan *result_plan = (Plan *) NULL;
AttrNumber *groupColIdx = NULL;
Index rt_index;
if (parse->unionClause)
@ -138,36 +134,35 @@ union_planner(Query *parse)
else
{
List **vpm = NULL;
List *sub_tlist;
/*
* If there is a HAVING clause, make sure all vars referenced in it
* are included in the target list for query_planner().
/* Preprocess targetlist in case we are inside an INSERT/UPDATE. */
tlist = preprocess_targetlist(tlist,
parse->commandType,
parse->resultRelation,
parse->rtable);
/* Add row-mark targets for UPDATE
* (should this be done in preprocess_targetlist?)
*/
if (parse->havingQual)
new_tlist = check_having_qual_for_vars(parse->havingQual, new_tlist);
new_tlist = preprocess_targetlist(new_tlist,
parse->commandType,
parse->resultRelation,
parse->rtable);
/* FOR UPDATE ... */
if (parse->rowMark != NULL)
{
List *l;
TargetEntry *ctid;
Resdom *resdom;
Var *var;
char *resname;
foreach (l, parse->rowMark)
{
if (!(((RowMark*)lfirst(l))->info & ROW_MARK_FOR_UPDATE))
RowMark *rowmark = (RowMark*) lfirst(l);
TargetEntry *ctid;
Resdom *resdom;
Var *var;
char *resname;
if (!(rowmark->info & ROW_MARK_FOR_UPDATE))
continue;
resname = (char*) palloc(32);
sprintf(resname, "ctid%u", ((RowMark*)lfirst(l))->rti);
resdom = makeResdom(length(new_tlist) + 1,
sprintf(resname, "ctid%u", rowmark->rti);
resdom = makeResdom(length(tlist) + 1,
TIDOID,
-1,
resname,
@ -175,20 +170,20 @@ union_planner(Query *parse)
0,
1);
var = makeVar(((RowMark*)lfirst(l))->rti, -1, TIDOID,
-1, 0, ((RowMark*)lfirst(l))->rti, -1);
var = makeVar(rowmark->rti, -1, TIDOID,
-1, 0, rowmark->rti, -1);
ctid = makeTargetEntry(resdom, (Node *) var);
new_tlist = lappend(new_tlist, ctid);
tlist = lappend(tlist, ctid);
}
}
/* Here starts the original (pre having) code */
tlist = preprocess_targetlist(tlist,
parse->commandType,
parse->resultRelation,
parse->rtable);
/* Generate appropriate target list for subplan; may be different
* from tlist if grouping or aggregation is needed.
*/
sub_tlist = make_subplanTargetList(parse, tlist, &groupColIdx);
/* Generate the (sub) plan */
if (parse->rtable != NULL)
{
vpm = (List **) palloc(length(parse->rtable) * sizeof(List *));
@ -196,9 +191,9 @@ union_planner(Query *parse)
}
PlannerVarParam = lcons(vpm, PlannerVarParam);
result_plan = query_planner(parse,
parse->commandType,
new_tlist,
(List *) parse->qual);
parse->commandType,
sub_tlist,
(List *) parse->qual);
PlannerVarParam = lnext(PlannerVarParam);
if (vpm != NULL)
pfree(vpm);
@ -211,21 +206,28 @@ union_planner(Query *parse)
if (parse->groupClause)
{
bool tuplePerGroup;
List *group_tlist;
/*
* decide whether how many tuples per group the Group node needs
* Decide whether how many tuples per group the Group node needs
* to return. (Needs only one tuple per group if no aggregate is
* present. Otherwise, need every tuple from the group to do the
* aggregation.)
* aggregation.) Note tuplePerGroup is named backwards :-(
*/
tuplePerGroup = parse->hasAggs;
/***S*H***/
/* Use 'new_tlist' instead of 'tlist' */
result_plan = make_groupPlan(&new_tlist,
tuplePerGroup,
parse->groupClause,
result_plan);
/* If there are aggregates then the Group node should just return
* the same (simplified) tlist as the subplan, which we indicate
* to make_groupplan by passing NIL. If there are no aggregates
* then the Group node had better compute the final tlist.
*/
group_tlist = parse->hasAggs ? NIL : tlist;
result_plan = make_groupplan(group_tlist,
tuplePerGroup,
parse->groupClause,
groupColIdx,
result_plan);
}
/*
@ -274,10 +276,6 @@ union_planner(Query *parse)
*/
if (parse->hasAggs)
{
/* Use 'tlist' not 'new_tlist' as target list because we
* don't want the additional attributes used for the havingQual
* (see above) to show up in the result
*/
result_plan = (Plan *) make_agg(tlist, result_plan);
/* HAVING clause, if any, becomes qual of the Agg node */
@ -289,6 +287,16 @@ union_planner(Query *parse)
*/
if (! set_agg_tlist_references((Agg *) result_plan))
elog(ERROR, "SELECT/HAVING requires aggregates to be valid");
/*
* Check that we actually found some aggregates, else executor
* will die unpleasantly. (The rewrite module currently has bugs
* that allow hasAggs to be incorrectly set 'true' sometimes.
* It's not easy to recover here, since we've already made decisions
* assuming there will be an Agg node.)
*/
if (((Agg *) result_plan)->aggs == NIL)
elog(ERROR, "union_planner: query is marked hasAggs, but I don't see any");
}
/*
@ -316,6 +324,276 @@ union_planner(Query *parse)
}
/*---------------
* make_subplanTargetList
* Generate appropriate target lists when grouping is required.
*
* When union_planner inserts Aggregate and/or Group/Sort plan nodes above
* the result of query_planner, we typically need to pass a different
* target list to query_planner than the outer plan nodes should have.
* This routine generates the correct target list for the subplan, and
* if necessary modifies the target list for the inserted nodes as well.
*
* The initial target list passed from the parser already contains entries
* for all ORDER BY and GROUP BY expressions, but it will not have entries
* for variables used only in HAVING clauses; so we need to add those
* variables to the subplan target list. Also, if we are doing either
* grouping or aggregation, we flatten all expressions except GROUP BY items
* into their component variables; the other expressions will be computed by
* the inserted nodes rather than by the subplan. For example,
* given a query like
* SELECT a+b,SUM(c+d) FROM table GROUP BY a+b;
* we want to pass this targetlist to the subplan:
* a+b,c,d
* where the a+b target will be used by the Sort/Group steps, and the
* c and d targets will be needed to compute the aggregate results.
*
* 'parse' is the query being processed.
* 'tlist' is the query's target list. CAUTION: list elements may be
* modified by this routine!
* 'groupColIdx' receives an array of column numbers for the GROUP BY
* expressions (if there are any) in the subplan's target list.
*
* The result is the targetlist to be passed to the subplan. Also,
* the parent tlist is modified so that any nontrivial targetlist items that
* exactly match GROUP BY items are replaced by simple Var nodes referencing
* those outputs of the subplan. This avoids redundant recalculations in
* cases like
* SELECT a+1, ... GROUP BY a+1
* Note, however, that other varnodes in the parent's targetlist (and
* havingQual, if any) will still need to be updated to refer to outputs
* of the subplan. This routine is quite large enough already, so we do
* that later.
*---------------
*/
static List *
make_subplanTargetList(Query *parse,
List *tlist,
AttrNumber **groupColIdx)
{
List *sub_tlist;
List *prnt_tlist;
List *sl,
*gl;
List *glc = NIL;
List *extravars = NIL;
int numCols;
AttrNumber *grpColIdx = NULL;
int next_resno = 1;
*groupColIdx = NULL;
/* If we're not grouping or aggregating, nothing to do here;
* query_planner should receive the unmodified target list.
*/
if (!parse->hasAggs && !parse->groupClause && !parse->havingQual)
return tlist;
/* If grouping, make a working copy of groupClause list (which we use
* just to verify that we found all the groupClause items in tlist).
* Also allocate space to remember where the group columns are in the
* subplan tlist.
*/
numCols = length(parse->groupClause);
if (numCols > 0)
{
glc = listCopy(parse->groupClause);
grpColIdx = (AttrNumber *) palloc(sizeof(AttrNumber) * numCols);
*groupColIdx = grpColIdx;
}
sub_tlist = new_unsorted_tlist(tlist); /* make a modifiable copy */
/*
* Step 1: build grpColIdx by finding targetlist items that match
* GroupBy entries. If there are aggregates, remove non-GroupBy items
* from sub_tlist, and reset its resnos accordingly. When we leave an
* expression in the subplan tlist, modify the parent tlist to copy the
* value from the subplan output rather than re-evaluating it.
*/
prnt_tlist = tlist; /* scans parent tlist in sync with sl */
foreach(sl, sub_tlist)
{
TargetEntry *te = (TargetEntry *) lfirst(sl);
TargetEntry *parentte = (TargetEntry *) lfirst(prnt_tlist);
Resdom *resdom = te->resdom;
bool keepInSubPlan = true;
bool foundGroupClause = false;
int keyno = 0;
foreach(gl, parse->groupClause)
{
GroupClause *grpcl = (GroupClause *) lfirst(gl);
keyno++; /* sort key # for this GroupClause */
/* Is it safe to use just resno to match tlist and glist items?? */
if (grpcl->entry->resdom->resno == resdom->resno)
{
/* Found a matching groupclause; record info for sorting */
foundGroupClause = true;
resdom->reskey = keyno;
resdom->reskeyop = get_opcode(grpcl->grpOpoid);
grpColIdx[keyno - 1] = next_resno;
/* Remove groupclause from our list of unmatched groupclauses.
* NB: this depends on having used a shallow listCopy() above.
*/
glc = lremove((void*) grpcl, glc);
break;
}
}
if (! foundGroupClause)
{
/*
* Non-GroupBy entry: remove it from subplan if there are
* aggregates in query - it will be evaluated by Aggregate plan.
* But do not remove simple-Var entries; we'd just have to add
* them back anyway, and we risk confusing INSERT/UPDATE.
*/
if (parse->hasAggs && ! IsA(te->expr, Var))
keepInSubPlan = false;
}
if (keepInSubPlan)
{
/* Assign new sequential resnos to subplan tlist items */
resdom->resno = next_resno++;
if (! IsA(parentte->expr, Var))
{
/* Since the item is being computed in the subplan,
* we can just make a Var node to reference it in the
* outer plan, rather than recomputing it there.
* Note we use varnoold = -1 as a flag to let
* replace_vars_with_subplan_refs know it needn't change
* this Var node.
* If it's only a Var anyway, we leave it alone for now;
* replace_vars_with_subplan_refs will fix it later.
*/
parentte->expr = (Node *) makeVar(1, resdom->resno,
resdom->restype,
resdom->restypmod,
0, -1, resdom->resno);
}
}
else
{
/* Remove this tlist item from the subplan, but remember the
* vars it needs. The outer tlist item probably needs changes,
* but that will happen later.
*/
sub_tlist = lremove(te, sub_tlist);
extravars = nconc(extravars, pull_var_clause(te->expr));
}
prnt_tlist = lnext(prnt_tlist);
}
/* We should have found all the GROUP BY clauses in the tlist. */
if (length(glc) != 0)
elog(ERROR, "make_subplanTargetList: GROUP BY attribute not found in target list");
/*
* Add subplan targets for any variables needed by removed tlist entries
* that aren't otherwise mentioned in the subplan target list.
* We'll also need targets for any variables seen only in HAVING.
*/
extravars = nconc(extravars, pull_var_clause(parse->havingQual));
foreach(gl, extravars)
{
Var *v = (Var *) lfirst(gl);
if (tlist_member(v, sub_tlist) == NULL)
{
sub_tlist = lappend(sub_tlist,
create_tl_element(v, next_resno));
next_resno++;
}
}
return sub_tlist;
}
static Plan *
make_groupplan(List *group_tlist,
bool tuplePerGroup,
List *groupClause,
AttrNumber *grpColIdx,
Plan *subplan)
{
List *sort_tlist;
List *sl;
Sort *sortplan;
Group *grpplan;
int numCols = length(groupClause);
/*
* Make the targetlist for the Sort node; it always just references
* each of the corresponding target items of the subplan. We need to
* ensure that simple Vars in the subplan's target list are recognizable
* by replace_vars_with_subplan_refs when it's applied to the Sort/Group
* target list, so copy up their varnoold/varoattno.
*/
sort_tlist = NIL;
foreach(sl, subplan->targetlist)
{
TargetEntry *te = (TargetEntry *) lfirst(sl);
Resdom *resdom = te->resdom;
Var *newvar;
if (IsA(te->expr, Var))
{
Var *subvar = (Var *) te->expr;
newvar = makeVar(1, resdom->resno,
resdom->restype, resdom->restypmod,
0, subvar->varnoold, subvar->varoattno);
}
else
{
newvar = makeVar(1, resdom->resno,
resdom->restype, resdom->restypmod,
0, -1, resdom->resno);
}
sort_tlist = lappend(sort_tlist,
makeTargetEntry((Resdom *) copyObject(resdom),
(Node *) newvar));
}
/*
* Make the Sort node
*/
sortplan = make_sort(sort_tlist,
_NONAME_RELATION_ID_,
subplan,
numCols);
sortplan->plan.cost = subplan->cost; /* XXX assume no cost */
/*
* If the caller gave us a target list, use it after fixing the variables.
* If not, we need the same sort of "repeater" tlist as for the Sort node.
*/
if (group_tlist)
{
group_tlist = copyObject(group_tlist); /* necessary?? */
replace_tlist_with_subplan_refs(group_tlist,
(Index) 0,
subplan->targetlist);
}
else
{
group_tlist = copyObject(sort_tlist);
}
/*
* Make the Group node
*/
grpplan = make_group(group_tlist, tuplePerGroup, numCols,
grpColIdx, sortplan);
return (Plan *) grpplan;
}
/*
* make_sortplan
* Returns a sortplan which is basically a SORT node attached to the
@ -384,6 +662,8 @@ make_sortplan(List *tlist, List *sortcls, Plan *plannode)
* the final query in the function. We do some ad-hoc define-time
* type checking here to be sure that the user is returning the
* type he claims.
*
* XXX Why is this function in this module?
*/
void
pg_checkretval(Oid rettype, QueryTreeList *queryTreeList)

413
src/backend/optimizer/plan/setrefs.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.43 1999/04/29 00:20:27 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/setrefs.c,v 1.44 1999/05/03 00:38:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -42,9 +42,8 @@ static List *replace_subclause_joinvar_refs(List *clauses,
List *outer_tlist, List *inner_tlist);
static Var *replace_joinvar_refs(Var *var, List *outer_tlist, List *inner_tlist);
static List *tlist_noname_references(Oid nonameid, List *tlist);
static void replace_result_clause(Node *clause, List *subplanTargetList);
static bool OperandIsInner(Node *opnd, int inner_relid);
static List *replace_agg_clause(Node *expr, List *targetlist);
static List *pull_agg_clause(Node *clause);
static Node *del_agg_clause(Node *clause);
static void set_result_tlist_references(Result *resultNode);
@ -542,9 +541,6 @@ set_result_tlist_references(Result *resultNode)
Plan *subplan;
List *resultTargetList;
List *subplanTargetList;
List *t;
TargetEntry *entry;
Expr *expr;
resultTargetList = ((Plan *) resultNode)->targetlist;
@ -558,33 +554,51 @@ set_result_tlist_references(Result *resultNode)
else
subplanTargetList = NIL;
/*
* now for traverse all the entris of the target list. These should be
* of the form (Resdom_Node Expression). For every expression clause,
* call "replace_result_clause()" to appropriatelly change all the Var
* nodes.
*/
foreach(t, resultTargetList)
replace_tlist_with_subplan_refs(resultTargetList,
(Index) OUTER,
subplanTargetList);
}
/*---------------------------------------------------------
*
* replace_tlist_with_subplan_refs
*
* Applies replace_vars_with_subplan_refs() to each entry of a targetlist.
*/
void
replace_tlist_with_subplan_refs(List *tlist,
Index subvarno,
List *subplanTargetList)
{
List *t;
foreach(t, tlist)
{
entry = (TargetEntry *) lfirst(t);
expr = (Expr *) get_expr(entry);
replace_result_clause((Node *) expr, subplanTargetList);
TargetEntry *entry = (TargetEntry *) lfirst(t);
replace_vars_with_subplan_refs((Node *) get_expr(entry),
subvarno, subplanTargetList);
}
}
/*---------------------------------------------------------
*
* replace_result_clause
* replace_vars_with_subplan_refs
*
* This routine is called from set_result_tlist_references().
* and modifies the expressions of the target list of a Result
* node so that all Var nodes reference the target list of its subplan.
* This routine modifies (destructively!) an expression tree so that all
* Var nodes reference target nodes of a subplan. It is used to fix up
* target expressions of upper-level plan nodes.
*
* 'clause': the tree to be fixed
* 'subvarno': varno to be assigned to all Vars
* 'subplanTargetList': target list for subplan
*
* Afterwards, all Var nodes have varno = subvarno, varattno = resno
* of corresponding subplan target.
*/
static void
replace_result_clause(Node *clause,
List *subplanTargetList) /* target list of the
* subplan */
void
replace_vars_with_subplan_refs(Node *clause,
Index subvarno,
List *subplanTargetList)
{
List *t;
@ -592,82 +606,100 @@ replace_result_clause(Node *clause,
return;
if (IsA(clause, Var))
{
TargetEntry *subplanVar;
/*
* Ha! A Var node!
*
* It could be that this varnode has been created by make_groupplan
* and is already set up to reference the subplan target list.
* We recognize that case by varno = 1, varnoold = -1,
* varattno = varoattno, and varlevelsup = 0. (Probably ought to
* have an explicit flag, but this should do for now.)
*/
subplanVar = match_varid((Var *) clause, subplanTargetList);
Var *var = (Var *) clause;
TargetEntry *subplanVar;
if (var->varno == (Index) 1 &&
var->varnoold == ((Index) -1) &&
var->varattno == var->varoattno &&
var->varlevelsup == 0)
return; /* OK to leave it alone */
/* Otherwise it had better be in the subplan list. */
subplanVar = match_varid(var, subplanTargetList);
if (! subplanVar)
elog(ERROR, "replace_result_clause: variable not in target list");
elog(ERROR, "replace_vars_with_subplan_refs: variable not in target list");
/*
* Change the varno & varattno fields of the var node.
*/
((Var *) clause)->varno = (Index) OUTER;
((Var *) clause)->varattno = subplanVar->resdom->resno;
var->varno = subvarno;
var->varattno = subplanVar->resdom->resno;
}
else if (IsA(clause, Aggref))
replace_result_clause(((Aggref *) clause)->target, subplanTargetList);
else if (is_funcclause(clause))
{
List *subExpr;
/*
* This is a function. Recursively call this routine for its
* arguments...
*/
subExpr = ((Expr *) clause)->args;
foreach(t, subExpr)
replace_result_clause(lfirst(t), subplanTargetList);
}
else if (IsA(clause, ArrayRef))
{
ArrayRef *aref = (ArrayRef *) clause;
/*
* This is an arrayref. Recursively call this routine for its
* expression and its index expression...
*/
foreach(t, aref->refupperindexpr)
replace_result_clause(lfirst(t), subplanTargetList);
foreach(t, aref->reflowerindexpr)
replace_result_clause(lfirst(t), subplanTargetList);
replace_result_clause(aref->refexpr,
subplanTargetList);
replace_result_clause(aref->refassgnexpr,
subplanTargetList);
}
else if (is_opclause(clause))
{
Node *subNode;
/*
* This is an operator. Recursively call this routine for both its
* left and right operands
*/
subNode = (Node *) get_leftop((Expr *) clause);
replace_result_clause(subNode, subplanTargetList);
subNode = (Node *) get_rightop((Expr *) clause);
replace_result_clause(subNode, subplanTargetList);
}
else if (IsA(clause, Param) ||IsA(clause, Const))
else if (single_node(clause))
{
/* do nothing! */
}
else if (IsA(clause, Iter))
replace_vars_with_subplan_refs(((Iter *) clause)->iterexpr,
subvarno, subplanTargetList);
else if (is_subplan(clause))
{
foreach(t, ((Expr *) clause)->args)
replace_vars_with_subplan_refs(lfirst(t),
subvarno, subplanTargetList);
foreach(t, ((SubPlan *) ((Expr *) clause)->oper)->sublink->oper)
replace_vars_with_subplan_refs(lfirst(((Expr *) lfirst(t))->args),
subvarno, subplanTargetList);
}
else if (IsA(clause, Expr))
{
/*
* Recursively scan the arguments of an expression.
* NOTE: this must come after is_subplan() case since
* subplan is a kind of Expr node.
*/
foreach(t, ((Expr *) clause)->args)
replace_vars_with_subplan_refs(lfirst(t),
subvarno, subplanTargetList);
}
else if (IsA(clause, Aggref))
replace_vars_with_subplan_refs(((Aggref *) clause)->target,
subvarno, subplanTargetList);
else if (IsA(clause, ArrayRef))
{
ArrayRef *aref = (ArrayRef *) clause;
foreach(t, aref->refupperindexpr)
replace_vars_with_subplan_refs(lfirst(t),
subvarno, subplanTargetList);
foreach(t, aref->reflowerindexpr)
replace_vars_with_subplan_refs(lfirst(t),
subvarno, subplanTargetList);
replace_vars_with_subplan_refs(aref->refexpr,
subvarno, subplanTargetList);
replace_vars_with_subplan_refs(aref->refassgnexpr,
subvarno, subplanTargetList);
}
else if (case_clause(clause))
{
foreach(t, ((CaseExpr *) clause)->args)
{
CaseWhen *when = (CaseWhen *) lfirst(t);
replace_vars_with_subplan_refs(when->expr,
subvarno, subplanTargetList);
replace_vars_with_subplan_refs(when->result,
subvarno, subplanTargetList);
}
replace_vars_with_subplan_refs(((CaseExpr *) clause)->defresult,
subvarno, subplanTargetList);
}
else
{
/*
* Ooops! we can not handle that!
*/
elog(ERROR, "replace_result_clause: Can not handle this tlist!\n");
elog(ERROR, "replace_vars_with_subplan_refs: Cannot handle node type %d",
nodeTag(clause));
}
}
static
bool
static bool
OperandIsInner(Node *opnd, int inner_relid)
{
@ -723,15 +755,22 @@ set_agg_tlist_references(Agg *aggNode)
{
TargetEntry *tle = lfirst(tl);
aggNode->aggs = nconc(replace_agg_clause(tle->expr, subplanTargetList),
aggNode->aggs);
replace_vars_with_subplan_refs(tle->expr,
(Index) 0,
subplanTargetList);
aggNode->aggs = nconc(pull_agg_clause(tle->expr), aggNode->aggs);
}
all_quals_ok = true;
foreach(ql, aggNode->plan.qual)
{
Node *qual = lfirst(ql);
List *qualaggs = replace_agg_clause(qual, subplanTargetList);
List *qualaggs;
replace_vars_with_subplan_refs(qual,
(Index) 0,
subplanTargetList);
qualaggs = pull_agg_clause(qual);
if (qualaggs == NIL)
all_quals_ok = false; /* this qual clause has no agg functions! */
else
@ -741,34 +780,21 @@ set_agg_tlist_references(Agg *aggNode)
return all_quals_ok;
}
/*
* Make a list of all Aggref nodes contained in the given expression.
*/
static List *
replace_agg_clause(Node *clause, List *subplanTargetList)
pull_agg_clause(Node *clause)
{
List *t;
List *agg_list = NIL;
List *t;
if (clause == NULL)
return NIL;
if (IsA(clause, Var))
{
TargetEntry *subplanVar;
/*
* Ha! A Var node!
*/
subplanVar = match_varid((Var *) clause, subplanTargetList);
if (! subplanVar)
elog(ERROR, "replace_agg_clause: variable not in target list");
/*
* Change the varno & varattno fields of the var node.
*/
((Var *) clause)->varattno = subplanVar->resdom->resno;
else if (single_node(clause))
return NIL;
}
else if (IsA(clause, Iter))
return pull_agg_clause(((Iter *) clause)->iterexpr);
else if (is_subplan(clause))
{
SubLink *sublink = ((SubPlan *) ((Expr *) clause)->oper)->sublink;
@ -778,13 +804,10 @@ replace_agg_clause(Node *clause, List *subplanTargetList)
* aggregates to be attached to the aggs list
*/
foreach(t, sublink->lefthand)
agg_list = nconc(replace_agg_clause(lfirst(t), subplanTargetList),
agg_list);
agg_list = nconc(pull_agg_clause(lfirst(t)), agg_list);
/* The first argument of ...->oper has also to be checked */
foreach(t, sublink->oper)
agg_list = nconc(replace_agg_clause(lfirst(t), subplanTargetList),
agg_list);
return agg_list;
agg_list = nconc(pull_agg_clause(lfirst(t)), agg_list);
}
else if (IsA(clause, Expr))
{
@ -794,53 +817,41 @@ replace_agg_clause(Node *clause, List *subplanTargetList)
* subplan is a kind of Expr node.
*/
foreach(t, ((Expr *) clause)->args)
{
agg_list = nconc(replace_agg_clause(lfirst(t), subplanTargetList),
agg_list);
}
return agg_list;
agg_list = nconc(pull_agg_clause(lfirst(t)), agg_list);
}
else if (IsA(clause, Aggref))
{
return lcons(clause,
replace_agg_clause(((Aggref *) clause)->target,
subplanTargetList));
pull_agg_clause(((Aggref *) clause)->target));
}
else if (IsA(clause, ArrayRef))
{
ArrayRef *aref = (ArrayRef *) clause;
/*
* This is an arrayref. Recursively call this routine for its
* expression and its index expression...
*/
foreach(t, aref->refupperindexpr)
agg_list = nconc(replace_agg_clause(lfirst(t), subplanTargetList),
agg_list);
agg_list = nconc(pull_agg_clause(lfirst(t)), agg_list);
foreach(t, aref->reflowerindexpr)
agg_list = nconc(replace_agg_clause(lfirst(t), subplanTargetList),
agg_list);
agg_list = nconc(replace_agg_clause(aref->refexpr, subplanTargetList),
agg_list);
agg_list = nconc(replace_agg_clause(aref->refassgnexpr,
subplanTargetList),
agg_list);
return agg_list;
agg_list = nconc(pull_agg_clause(lfirst(t)), agg_list);
agg_list = nconc(pull_agg_clause(aref->refexpr), agg_list);
agg_list = nconc(pull_agg_clause(aref->refassgnexpr), agg_list);
}
else if (IsA(clause, Param) || IsA(clause, Const))
else if (case_clause(clause))
{
/* do nothing! */
return NIL;
foreach(t, ((CaseExpr *) clause)->args)
{
CaseWhen *when = (CaseWhen *) lfirst(t);
agg_list = nconc(agg_list, pull_agg_clause(when->expr));
agg_list = nconc(agg_list, pull_agg_clause(when->result));
}
agg_list = nconc(pull_agg_clause(((CaseExpr *) clause)->defresult),
agg_list);
}
else
{
/*
* Ooops! we can not handle that!
*/
elog(ERROR, "replace_agg_clause: Cannot handle node type %d",
elog(ERROR, "pull_agg_clause: Cannot handle node type %d",
nodeTag(clause));
return NIL;
}
return agg_list;
}
@ -932,99 +943,6 @@ del_agg_clause(Node *clause)
return NULL;
}
/*
* check_having_qual_for_vars takes the havingQual and the actual targetlist
* as arguments and recursively scans the havingQual for attributes that are
* not included in the targetlist yet. This will occur with queries like:
*
* SELECT sid FROM part GROUP BY sid HAVING MIN(pid) > 1;
*
* To be able to handle queries like that correctly we have to extend the
* actual targetlist (which will be the one used for the GROUP node later on)
* by these attributes. The return value is the extended targetlist.
*/
List *
check_having_qual_for_vars(Node *clause, List *targetlist_so_far)
{
List *t;
if (clause == NULL)
return targetlist_so_far;
if (IsA(clause, Var))
{
RelOptInfo tmp_rel;
/*
* Ha! A Var node!
*/
tmp_rel.targetlist = targetlist_so_far;
/* Check if the VAR is already contained in the targetlist */
if (tlist_member((Var *) clause, (List *) targetlist_so_far) == NULL)
add_var_to_tlist(&tmp_rel, (Var *) clause);
return tmp_rel.targetlist;
}
else if (IsA(clause, Expr) && ! is_subplan(clause))
{
/*
* Recursively scan the arguments of an expression.
*/
foreach(t, ((Expr *) clause)->args)
targetlist_so_far = check_having_qual_for_vars(lfirst(t), targetlist_so_far);
return targetlist_so_far;
}
else if (IsA(clause, Aggref))
{
targetlist_so_far = check_having_qual_for_vars(((Aggref *) clause)->target, targetlist_so_far);
return targetlist_so_far;
}
else if (IsA(clause, ArrayRef))
{
ArrayRef *aref = (ArrayRef *) clause;
/*
* This is an arrayref. Recursively call this routine for its
* expression and its index expression...
*/
foreach(t, aref->refupperindexpr)
targetlist_so_far = check_having_qual_for_vars(lfirst(t), targetlist_so_far);
foreach(t, aref->reflowerindexpr)
targetlist_so_far = check_having_qual_for_vars(lfirst(t), targetlist_so_far);
targetlist_so_far = check_having_qual_for_vars(aref->refexpr, targetlist_so_far);
targetlist_so_far = check_having_qual_for_vars(aref->refassgnexpr, targetlist_so_far);
return targetlist_so_far;
}
else if (IsA(clause, Param) || IsA(clause, Const))
{
/* do nothing! */
return targetlist_so_far;
}
/*
* If we get to a sublink, then we only have to check the lefthand
* side of the expression to see if there are any additional VARs.
* QUESTION: can this code actually be hit?
*/
else if (IsA(clause, SubLink))
{
foreach(t, ((SubLink *) clause)->lefthand)
targetlist_so_far = check_having_qual_for_vars(lfirst(t), targetlist_so_far);
return targetlist_so_far;
}
else
{
/*
* Ooops! we can not handle that!
*/
elog(ERROR, "check_having_qual_for_vars: Cannot handle node type %d",
nodeTag(clause));
return NIL;
}
}
/*
* check_having_for_ungrouped_vars takes the havingQual and the list of
* GROUP BY clauses and checks for subplans in the havingQual that are being
@ -1053,6 +971,15 @@ check_having_for_ungrouped_vars(Node *clause, List *groupClause)
* parser already checked 'em.
*/
}
else if (single_node(clause))
{
/* ignore */
}
else if (IsA(clause, Iter))
{
check_having_for_ungrouped_vars(((Iter *) clause)->iterexpr,
groupClause);
}
else if (is_subplan(clause))
{
/*
@ -1098,8 +1025,8 @@ check_having_for_ungrouped_vars(Node *clause, List *groupClause)
}
else if (IsA(clause, Aggref))
{
check_having_for_ungrouped_vars(((Aggref *) clause)->target,
groupClause);
check_having_for_ungrouped_vars(((Aggref *) clause)->target,
groupClause);
}
else if (IsA(clause, ArrayRef))
{
@ -1116,15 +1043,19 @@ check_having_for_ungrouped_vars(Node *clause, List *groupClause)
check_having_for_ungrouped_vars(aref->refexpr, groupClause);
check_having_for_ungrouped_vars(aref->refassgnexpr, groupClause);
}
else if (IsA(clause, Param) || IsA(clause, Const))
else if (case_clause(clause))
{
/* do nothing! */
foreach(t, ((CaseExpr *) clause)->args)
{
CaseWhen *when = (CaseWhen *) lfirst(t);
check_having_for_ungrouped_vars(when->expr, groupClause);
check_having_for_ungrouped_vars(when->result, groupClause);
}
check_having_for_ungrouped_vars(((CaseExpr *) clause)->defresult,
groupClause);
}
else
{
/*
* Ooops! we can not handle that!
*/
elog(ERROR, "check_having_for_ungrouped_vars: Cannot handle node type %d",
nodeTag(clause));
}

110
src/backend/optimizer/util/var.c
View File

@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.17 1999/02/22 05:26:27 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/optimizer/util/var.c,v 1.18 1999/05/03 00:38:44 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -68,43 +68,31 @@ pull_varnos(Node *me)
/*
* contain_var_clause
* Recursively find var nodes from a clause by pulling vars from the
* left and right operands of the clause.
* Recursively scan a clause to discover whether it contains any Var nodes.
*
* Returns true if any varnode found.
*/
bool
contain_var_clause(Node *clause)
{
List *temp;
if (clause == NULL)
return FALSE;
else if (IsA(clause, Var))
return TRUE;
else if (IsA(clause, Iter))
return contain_var_clause(((Iter *) clause)->iterexpr);
else if (single_node(clause))
return FALSE;
else if (or_clause(clause) || and_clause(clause) || is_funcclause(clause))
{
List *temp;
foreach(temp, ((Expr *) clause)->args)
{
if (contain_var_clause(lfirst(temp)))
return TRUE;
}
return FALSE;
}
else if (IsA(clause, Iter))
return contain_var_clause(((Iter *) clause)->iterexpr);
else if (is_subplan(clause))
{
List *temp;
foreach(temp, ((Expr *) clause)->args)
{
if (contain_var_clause(lfirst(temp)))
return TRUE;
}
/* Ok - check left sides of Oper-s */
/* Also check left sides of Oper-s */
foreach(temp, ((SubPlan *) ((Expr *) clause)->oper)->sublink->oper)
{
if (contain_var_clause(lfirst(((Expr *) lfirst(temp))->args)))
@ -112,10 +100,24 @@ contain_var_clause(Node *clause)
}
return FALSE;
}
else if (IsA(clause, Expr))
{
/*
* Recursively scan the arguments of an expression.
* NOTE: this must come after is_subplan() case since
* subplan is a kind of Expr node.
*/
foreach(temp, ((Expr *) clause)->args)
{
if (contain_var_clause(lfirst(temp)))
return TRUE;
}
return FALSE;
}
else if (IsA(clause, Aggref))
return contain_var_clause(((Aggref *) clause)->target);
else if (IsA(clause, ArrayRef))
{
List *temp;
foreach(temp, ((ArrayRef *) clause)->refupperindexpr)
{
if (contain_var_clause(lfirst(temp)))
@ -132,19 +134,11 @@ contain_var_clause(Node *clause)
return TRUE;
return FALSE;
}
else if (not_clause(clause))
return contain_var_clause((Node *) get_notclausearg((Expr *) clause));
else if (is_opclause(clause))
return (contain_var_clause((Node *) get_leftop((Expr *) clause)) ||
contain_var_clause((Node *) get_rightop((Expr *) clause)));
else if (case_clause(clause))
{
List *args;
CaseWhen *when;
foreach(args, ((CaseExpr *) clause)->args)
foreach(temp, ((CaseExpr *) clause)->args)
{
when = lfirst(args);
CaseWhen *when = (CaseWhen *) lfirst(temp);
if (contain_var_clause(when->expr))
return TRUE;
if (contain_var_clause(when->result))
@ -152,6 +146,11 @@ contain_var_clause(Node *clause)
}
return (contain_var_clause(((CaseExpr *) clause)->defresult));
}
else
{
elog(ERROR, "contain_var_clause: Cannot handle node type %d",
nodeTag(clause));
}
return FALSE;
}
@ -161,45 +160,46 @@ contain_var_clause(Node *clause)
* Recursively pulls all var nodes from a clause by pulling vars from the
* left and right operands of the clause.
*
* Returns list of varnodes found.
* Returns list of varnodes found. Note the varnodes themselves are not
* copied, only referenced.
*/
List *
pull_var_clause(Node *clause)
{
List *retval = NIL;
List *temp;
if (clause == NULL)
return NIL;
else if (IsA(clause, Var))
retval = lcons(clause, NIL);
else if (IsA(clause, Iter))
retval = pull_var_clause(((Iter *) clause)->iterexpr);
else if (single_node(clause))
retval = NIL;
else if (or_clause(clause) || and_clause(clause) || is_funcclause(clause))
{
List *temp;
foreach(temp, ((Expr *) clause)->args)
retval = nconc(retval, pull_var_clause(lfirst(temp)));
}
else if (IsA(clause, Iter))
retval = pull_var_clause(((Iter *) clause)->iterexpr);
else if (is_subplan(clause))
{
List *temp;
foreach(temp, ((Expr *) clause)->args)
retval = nconc(retval, pull_var_clause(lfirst(temp)));
/* Ok - get Var-s from left sides of Oper-s */
/* Also get Var-s from left sides of Oper-s */
foreach(temp, ((SubPlan *) ((Expr *) clause)->oper)->sublink->oper)
retval = nconc(retval,
pull_var_clause(lfirst(((Expr *) lfirst(temp))->args)));
}
else if (IsA(clause, Expr))
{
/*
* Recursively scan the arguments of an expression.
* NOTE: this must come after is_subplan() case since
* subplan is a kind of Expr node.
*/
foreach(temp, ((Expr *) clause)->args)
retval = nconc(retval, pull_var_clause(lfirst(temp)));
}
else if (IsA(clause, Aggref))
retval = pull_var_clause(((Aggref *) clause)->target);
else if (IsA(clause, ArrayRef))
{
List *temp;
foreach(temp, ((ArrayRef *) clause)->refupperindexpr)
retval = nconc(retval, pull_var_clause(lfirst(temp)));
foreach(temp, ((ArrayRef *) clause)->reflowerindexpr)
@ -209,25 +209,21 @@ pull_var_clause(Node *clause)
retval = nconc(retval,
pull_var_clause(((ArrayRef *) clause)->refassgnexpr));
}
else if (not_clause(clause))
retval = pull_var_clause((Node *) get_notclausearg((Expr *) clause));
else if (is_opclause(clause))
retval = nconc(pull_var_clause((Node *) get_leftop((Expr *) clause)),
pull_var_clause((Node *) get_rightop((Expr *) clause)));
else if (case_clause(clause))
{
List *temp;
foreach(temp, ((CaseExpr *) clause)->args)
{
retval = nconc(retval, pull_var_clause(((CaseWhen *) lfirst(temp))->expr));
retval = nconc(retval, pull_var_clause(((CaseWhen *) lfirst(temp))->result));
CaseWhen *when = (CaseWhen *) lfirst(temp);
retval = nconc(retval, pull_var_clause(when->expr));
retval = nconc(retval, pull_var_clause(when->result));
}
retval = nconc(retval, pull_var_clause(((CaseExpr *) clause)->defresult));
}
else
retval = NIL;
{
elog(ERROR, "pull_var_clause: Cannot handle node type %d",
nodeTag(clause));
}
return retval;
}

9
src/include/optimizer/planmain.h
View File

@ -6,7 +6,7 @@
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: planmain.h,v 1.23 1999/04/19 01:43:10 tgl Exp $
* $Id: planmain.h,v 1.24 1999/05/03 00:38:42 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -54,9 +54,14 @@ extern List *join_references(List *clauses, List *outer_tlist,
List *inner_tlist);
extern List *index_outerjoin_references(List *inner_indxqual,
List *outer_tlist, Index inner_relid);
extern void replace_tlist_with_subplan_refs(List *tlist,
Index subvarno,
List *subplanTargetList);
extern void replace_vars_with_subplan_refs(Node *clause,
Index subvarno,
List *subplanTargetList);
extern bool set_agg_tlist_references(Agg *aggNode);
extern void del_agg_tlist_references(List *tlist);
extern List *check_having_qual_for_vars(Node *clause, List *targetlist_so_far);
extern void check_having_for_ungrouped_vars(Node *clause, List *groupClause);
extern void transformKeySetQuery(Query *origNode);