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Commit6bc61fc

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committed
Adjust parser so that 'x NOT IN (subselect)' is converted to
'NOT (x IN (subselect))', that is 'NOT (x = ANY (subselect))',rather than 'x <> ALL (subselect)' as we formerly did. Thisopens the door to optimizing NOT IN the same way as IN, whereasthere's no hope of optimizing the expression using <>. Also,convert 'x <> ALL (subselect)' to the NOT(IN) style, so thatthe optimization will be available when processing rules dumpedby older Postgres versions.initdb forced due to small change in SubLink node representation.
1 parent59779c8 commit6bc61fc

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11 files changed

+111
-56
lines changed

11 files changed

+111
-56
lines changed

‎src/backend/executor/nodeSubplan.c

Lines changed: 5 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.40 2002/12/26 22:37:42 tgl Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/executor/nodeSubplan.c,v 1.41 2003/01/09 20:50:50 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -37,7 +37,7 @@ ExecSubPlan(SubPlanState *node,
3737
SubPlan*subplan= (SubPlan*)node->xprstate.expr;
3838
PlanState*planstate=node->planstate;
3939
SubLinkTypesubLinkType=subplan->subLinkType;
40-
booluseor=subplan->useor;
40+
booluseOr=subplan->useOr;
4141
MemoryContextoldcontext;
4242
TupleTableSlot*slot;
4343
Datumresult;
@@ -84,7 +84,7 @@ ExecSubPlan(SubPlanState *node,
8484
* For all sublink types except EXPR_SUBLINK, the result is boolean as
8585
* are the results of the combining operators.We combine results
8686
* within a tuple (if there are multiple columns) using OR semantics
87-
* if "useor" is true, AND semantics if not. We then combine results
87+
* if "useOr" is true, AND semantics if not. We then combine results
8888
* across tuples (if the subplan produces more than one) using OR
8989
* semantics for ANY_SUBLINK or AND semantics for ALL_SUBLINK.
9090
* (MULTIEXPR_SUBLINK doesn't allow multiple tuples from the subplan.)
@@ -107,7 +107,7 @@ ExecSubPlan(SubPlanState *node,
107107
{
108108
HeapTupletup=slot->val;
109109
TupleDesctdesc=slot->ttc_tupleDescriptor;
110-
Datumrowresult=BoolGetDatum(!useor);
110+
Datumrowresult=BoolGetDatum(!useOr);
111111
boolrownull= false;
112112
intcol=1;
113113

@@ -212,7 +212,7 @@ ExecSubPlan(SubPlanState *node,
212212
rowresult=expresult;
213213
rownull=expnull;
214214
}
215-
elseif (useor)
215+
elseif (useOr)
216216
{
217217
/* combine within row per OR semantics */
218218
if (expnull)

‎src/backend/nodes/copyfuncs.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,7 @@
1515
* Portions Copyright (c) 1994, Regents of the University of California
1616
*
1717
* IDENTIFICATION
18-
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.233 2002/12/14 00:17:50 tgl Exp $
18+
* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.234 2003/01/09 20:50:50 tgl Exp $
1919
*
2020
*-------------------------------------------------------------------------
2121
*/
@@ -809,7 +809,8 @@ _copySubLink(SubLink *from)
809809
SubLink*newnode=makeNode(SubLink);
810810

811811
COPY_SCALAR_FIELD(subLinkType);
812-
COPY_SCALAR_FIELD(useor);
812+
COPY_SCALAR_FIELD(operIsEquals);
813+
COPY_SCALAR_FIELD(useOr);
813814
COPY_NODE_FIELD(lefthand);
814815
COPY_NODE_FIELD(oper);
815816
COPY_NODE_FIELD(subselect);
@@ -826,7 +827,7 @@ _copySubPlan(SubPlan *from)
826827
SubPlan*newnode=makeNode(SubPlan);
827828

828829
COPY_SCALAR_FIELD(subLinkType);
829-
COPY_SCALAR_FIELD(useor);
830+
COPY_SCALAR_FIELD(useOr);
830831
COPY_NODE_FIELD(oper);
831832
COPY_NODE_FIELD(plan);
832833
COPY_SCALAR_FIELD(plan_id);

‎src/backend/nodes/equalfuncs.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -18,7 +18,7 @@
1818
* Portions Copyright (c) 1994, Regents of the University of California
1919
*
2020
* IDENTIFICATION
21-
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.177 2002/12/14 00:17:51 tgl Exp $
21+
* $Header: /cvsroot/pgsql/src/backend/nodes/equalfuncs.c,v 1.178 2003/01/09 20:50:50 tgl Exp $
2222
*
2323
*-------------------------------------------------------------------------
2424
*/
@@ -287,7 +287,8 @@ static bool
287287
_equalSubLink(SubLink*a,SubLink*b)
288288
{
289289
COMPARE_SCALAR_FIELD(subLinkType);
290-
COMPARE_SCALAR_FIELD(useor);
290+
COMPARE_SCALAR_FIELD(operIsEquals);
291+
COMPARE_SCALAR_FIELD(useOr);
291292
COMPARE_NODE_FIELD(lefthand);
292293
COMPARE_NODE_FIELD(oper);
293294
COMPARE_NODE_FIELD(subselect);
@@ -299,7 +300,7 @@ static bool
299300
_equalSubPlan(SubPlan*a,SubPlan*b)
300301
{
301302
COMPARE_SCALAR_FIELD(subLinkType);
302-
COMPARE_SCALAR_FIELD(useor);
303+
COMPARE_SCALAR_FIELD(useOr);
303304
COMPARE_NODE_FIELD(oper);
304305
/* should compare plans, but have to settle for comparing plan IDs */
305306
COMPARE_SCALAR_FIELD(plan_id);

‎src/backend/nodes/outfuncs.c

Lines changed: 4 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.190 2002/12/14 00:17:52 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.191 2003/01/09 20:50:50 tgl Exp $
1212
*
1313
* NOTES
1414
* Every node type that can appear in stored rules' parsetrees *must*
@@ -658,7 +658,8 @@ _outSubLink(StringInfo str, SubLink *node)
658658
WRITE_NODE_TYPE("SUBLINK");
659659

660660
WRITE_ENUM_FIELD(subLinkType,SubLinkType);
661-
WRITE_BOOL_FIELD(useor);
661+
WRITE_BOOL_FIELD(operIsEquals);
662+
WRITE_BOOL_FIELD(useOr);
662663
WRITE_NODE_FIELD(lefthand);
663664
WRITE_NODE_FIELD(oper);
664665
WRITE_NODE_FIELD(subselect);
@@ -670,7 +671,7 @@ _outSubPlan(StringInfo str, SubPlan *node)
670671
WRITE_NODE_TYPE("SUBPLAN");
671672

672673
WRITE_ENUM_FIELD(subLinkType,SubLinkType);
673-
WRITE_BOOL_FIELD(useor);
674+
WRITE_BOOL_FIELD(useOr);
674675
WRITE_NODE_FIELD(oper);
675676
WRITE_NODE_FIELD(plan);
676677
WRITE_INT_FIELD(plan_id);

‎src/backend/nodes/readfuncs.c

Lines changed: 3 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.144 2002/12/14 00:17:54 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.145 2003/01/09 20:50:51 tgl Exp $
1212
*
1313
* NOTES
1414
* Path and Plan nodes do not have any readfuncs support, because we
@@ -531,7 +531,8 @@ _readSubLink(void)
531531
READ_LOCALS(SubLink);
532532

533533
READ_ENUM_FIELD(subLinkType,SubLinkType);
534-
READ_BOOL_FIELD(useor);
534+
READ_BOOL_FIELD(operIsEquals);
535+
READ_BOOL_FIELD(useOr);
535536
READ_NODE_FIELD(lefthand);
536537
READ_NODE_FIELD(oper);
537538
READ_NODE_FIELD(subselect);

‎src/backend/optimizer/plan/subselect.c

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.61 2002/12/14 00:17:55 tgl Exp $
10+
* $Header: /cvsroot/pgsql/src/backend/optimizer/plan/subselect.c,v 1.62 2003/01/09 20:50:51 tgl Exp $
1111
*
1212
*-------------------------------------------------------------------------
1313
*/
@@ -225,7 +225,7 @@ make_subplan(SubLink *slink, List *lefthand)
225225
* Fill in other fields of the SubPlan node.
226226
*/
227227
node->subLinkType=slink->subLinkType;
228-
node->useor=slink->useor;
228+
node->useOr=slink->useOr;
229229
node->oper=NIL;
230230
node->setParam=NIL;
231231
node->parParam=NIL;
@@ -283,7 +283,7 @@ make_subplan(SubLink *slink, List *lefthand)
283283
&node->setParam);
284284
PlannerInitPlan=lappend(PlannerInitPlan,node);
285285
if (length(oper)>1)
286-
result= (Node*) (node->useor ?make_orclause(oper) :
286+
result= (Node*) (node->useOr ?make_orclause(oper) :
287287
make_andclause(oper));
288288
else
289289
result= (Node*)lfirst(oper);

‎src/backend/parser/gram.y

Lines changed: 20 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
1212
*
1313
* IDENTIFICATION
14-
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.391 2003/01/08 00:22:27 tgl Exp $
14+
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.392 2003/01/09 20:50:51 tgl Exp $
1515
*
1616
* HISTORY
1717
* AUTHORDATEMAJOR EVENT
@@ -5420,40 +5420,39 @@ opt_interval:
54205420

54215421
/* Expressions using row descriptors
54225422
* Define row_descriptor to allow yacc to break the reduce/reduce conflict
5423-
*with singleton expressions. Use SQL99's ROW keyword to allow rows of
5424-
*one element.
5423+
*with singleton expressions. Use SQL99's ROW keyword to allow rows of
5424+
* one element.
54255425
*/
54265426
r_expr: row IN_P select_with_parens
54275427
{
54285428
SubLink *n = makeNode(SubLink);
54295429
n->lefthand =$1;
54305430
n->oper = (List *) makeSimpleA_Expr(OP,"=",NULL,NULL);
5431-
n->useor =FALSE;
54325431
n->subLinkType = ANY_SUBLINK;
5432+
/* operIsEquals and useOr will be set later*/
54335433
n->subselect =$3;
54345434
$$ = (Node *)n;
54355435
}
54365436
| row NOT IN_P select_with_parens
54375437
{
5438+
/* Make an IN node*/
54385439
SubLink *n = makeNode(SubLink);
54395440
n->lefthand =$1;
5440-
n->oper = (List *) makeSimpleA_Expr(OP,"<>",NULL,NULL);
5441-
n->useor =TRUE;
5442-
n->subLinkType = ALL_SUBLINK;
5441+
n->oper = (List *) makeSimpleA_Expr(OP,"=",NULL,NULL);
5442+
n->subLinkType =ANY_SUBLINK;
5443+
/* operIsEquals and useOr will be set later*/
54435444
n->subselect =$4;
5444-
$$ = (Node *)n;
5445+
/* Stick a NOT on top*/
5446+
$$ = (Node *) makeA_Expr(NOT, NIL,NULL, (Node *) n);
54455447
}
54465448
| row qual_all_Op sub_type select_with_parens
54475449
%prec Op
54485450
{
54495451
SubLink *n = makeNode(SubLink);
54505452
n->lefthand =$1;
54515453
n->oper = (List *) makeA_Expr(OP,$2,NULL,NULL);
5452-
if (strcmp(strVal(llast($2)),"<>") ==0)
5453-
n->useor =TRUE;
5454-
else
5455-
n->useor =FALSE;
54565454
n->subLinkType =$3;
5455+
/* operIsEquals and useOr will be set later*/
54575456
n->subselect =$4;
54585457
$$ = (Node *)n;
54595458
}
@@ -5463,11 +5462,8 @@ r_expr: row IN_P select_with_parens
54635462
SubLink *n = makeNode(SubLink);
54645463
n->lefthand =$1;
54655464
n->oper = (List *) makeA_Expr(OP,$2,NULL,NULL);
5466-
if (strcmp(strVal(llast($2)),"<>") ==0)
5467-
n->useor =TRUE;
5468-
else
5469-
n->useor =FALSE;
54705465
n->subLinkType = MULTIEXPR_SUBLINK;
5466+
/* operIsEquals and useOr will be set later*/
54715467
n->subselect =$3;
54725468
$$ = (Node *)n;
54735469
}
@@ -5850,8 +5846,8 @@ a_expr:c_expr{ $$ = $1; }
58505846
SubLink *n = (SubLink *)$3;
58515847
n->lefthand = makeList1($1);
58525848
n->oper = (List *) makeSimpleA_Expr(OP,"=",NULL,NULL);
5853-
n->useor =FALSE;
58545849
n->subLinkType = ANY_SUBLINK;
5850+
/* operIsEquals and useOr will be set later*/
58555851
$$ = (Node *)n;
58565852
}
58575853
else
@@ -5875,12 +5871,14 @@ a_expr:c_expr{ $$ = $1; }
58755871
/* in_expr returns a SubLink or a list of a_exprs*/
58765872
if (IsA($4, SubLink))
58775873
{
5874+
/* Make an IN node*/
58785875
SubLink *n = (SubLink *)$4;
58795876
n->lefthand = makeList1($1);
5880-
n->oper = (List *) makeSimpleA_Expr(OP,"<>",NULL,NULL);
5881-
n->useor =FALSE;
5882-
n->subLinkType = ALL_SUBLINK;
5883-
$$ = (Node *)n;
5877+
n->oper = (List *) makeSimpleA_Expr(OP,"=",NULL,NULL);
5878+
n->subLinkType = ANY_SUBLINK;
5879+
/* operIsEquals and useOr will be set later*/
5880+
/* Stick a NOT on top*/
5881+
$$ = (Node *) makeA_Expr(NOT, NIL,NULL, (Node *) n);
58845882
}
58855883
else
58865884
{
@@ -5903,8 +5901,8 @@ a_expr:c_expr{ $$ = $1; }
59035901
SubLink *n = makeNode(SubLink);
59045902
n->lefthand = makeList1($1);
59055903
n->oper = (List *) makeA_Expr(OP,$2,NULL,NULL);
5906-
n->useor =FALSE;/* doesn't matter since only one col*/
59075904
n->subLinkType =$3;
5905+
/* operIsEquals and useOr will be set later*/
59085906
n->subselect =$4;
59095907
$$ = (Node *)n;
59105908
}
@@ -6447,7 +6445,6 @@ c_expr:columnref{ $$ = (Node *) $1; }
64476445
SubLink *n = makeNode(SubLink);
64486446
n->lefthand = NIL;
64496447
n->oper = NIL;
6450-
n->useor =FALSE;
64516448
n->subLinkType = EXPR_SUBLINK;
64526449
n->subselect =$1;
64536450
$$ = (Node *)n;
@@ -6457,7 +6454,6 @@ c_expr:columnref{ $$ = (Node *) $1; }
64576454
SubLink *n = makeNode(SubLink);
64586455
n->lefthand = NIL;
64596456
n->oper = NIL;
6460-
n->useor =FALSE;
64616457
n->subLinkType = EXISTS_SUBLINK;
64626458
n->subselect =$2;
64636459
$$ = (Node *)n;

‎src/backend/parser/parse_expr.c

Lines changed: 45 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.138 2002/12/27 20:06:19 tgl Exp $
11+
* $Header: /cvsroot/pgsql/src/backend/parser/parse_expr.c,v 1.139 2003/01/09 20:50:52 tgl Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -367,6 +367,8 @@ transformExpr(ParseState *pstate, Node *expr)
367367
*/
368368
sublink->lefthand=NIL;
369369
sublink->oper=NIL;
370+
sublink->operIsEquals= FALSE;
371+
sublink->useOr= FALSE;
370372
}
371373
elseif (sublink->subLinkType==EXPR_SUBLINK)
372374
{
@@ -391,27 +393,60 @@ transformExpr(ParseState *pstate, Node *expr)
391393
*/
392394
sublink->lefthand=NIL;
393395
sublink->oper=NIL;
396+
sublink->operIsEquals= FALSE;
397+
sublink->useOr= FALSE;
394398
}
395399
else
396400
{
397401
/* ALL, ANY, or MULTIEXPR: generate operator list */
398402
List*left_list=sublink->lefthand;
399403
List*right_list=qtree->targetList;
404+
introw_length=length(left_list);
405+
boolneedNot= false;
400406
List*op;
401407
char*opname;
402408
List*elist;
403409

410+
/* transform lefthand expressions */
404411
foreach(elist,left_list)
405412
lfirst(elist)=transformExpr(pstate,lfirst(elist));
406413

414+
/* get the combining-operator name */
407415
Assert(IsA(sublink->oper,A_Expr));
408416
op= ((A_Expr*)sublink->oper)->name;
409417
opname=strVal(llast(op));
410418
sublink->oper=NIL;
411419

420+
/*
421+
* If the expression is "<> ALL" (with unqualified opname)
422+
* then convert it to "NOT IN". This is a hack to improve
423+
* efficiency of expressions output by pre-7.4 Postgres.
424+
*/
425+
if (sublink->subLinkType==ALL_SUBLINK&&
426+
length(op)==1&&strcmp(opname,"<>")==0)
427+
{
428+
sublink->subLinkType=ANY_SUBLINK;
429+
opname=pstrdup("=");
430+
op=makeList1(makeString(opname));
431+
needNot= true;
432+
}
433+
434+
/* Set operIsEquals if op is unqualified "=" */
435+
if (length(op)==1&&strcmp(opname,"=")==0)
436+
sublink->operIsEquals= TRUE;
437+
else
438+
sublink->operIsEquals= FALSE;
439+
440+
/* Set useOr if op is "<>" (possibly qualified) */
441+
if (strcmp(opname,"<>")==0)
442+
sublink->useOr= TRUE;
443+
else
444+
sublink->useOr= FALSE;
445+
412446
/* Combining operators other than =/<> is dubious... */
413-
if (length(left_list)!=1&&
414-
strcmp(opname,"=")!=0&&strcmp(opname,"<>")!=0)
447+
if (row_length!=1&&
448+
strcmp(opname,"=")!=0&&
449+
strcmp(opname,"<>")!=0)
415450
elog(ERROR,"Row comparison cannot use operator %s",
416451
opname);
417452

@@ -474,6 +509,13 @@ transformExpr(ParseState *pstate, Node *expr)
474509
}
475510
if (left_list!=NIL)
476511
elog(ERROR,"Subselect has too few fields");
512+
513+
if (needNot)
514+
{
515+
expr=coerce_to_boolean(expr,"NOT");
516+
expr= (Node*)makeBoolExpr(NOT_EXPR,
517+
makeList1(expr));
518+
}
477519
}
478520
result= (Node*)expr;
479521
break;

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