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Commitf69ff0c

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Give 'a_expr ::= a_expr Op' production a slightly lower precedence than
Op, so that the sequence 'a_expr Op Op a_expr' will be parsed asa_expr Op (Op a_expr) not (a_expr Op) Op a_expr as formerly. In otherwords, prefer treating user-defined operators as prefix operators totreating them as postfix operators, when there is an ambiguity.Also clean up a couple of other infelicities in production priorityassignment --- for example, BETWEEN wasn't being given the intendedpriority, but that of AND.
1 parentedfca4b commitf69ff0c

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‎src/backend/parser/gram.y‎

Lines changed: 9 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -11,7 +11,7 @@
1111
*
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*
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* IDENTIFICATION
14-
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.217 2001/01/20 17:37:52 tgl Exp $
14+
* $Header: /cvsroot/pgsql/src/backend/parser/gram.y,v 2.218 2001/01/23 22:39:08 tgl Exp $
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*
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* HISTORY
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* AUTHORDATEMAJOR EVENT
@@ -383,16 +383,16 @@ static void doNegateFloat(Value *v);
383383
%nonassocOVERLAPS
384384
%nonassocBETWEEN
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%nonassocIN
386+
%leftPOSTFIXOP/* dummy for postfix Op rules*/
386387
%leftOp/* multi-character ops and user-defined operators*/
387388
%nonassocNOTNULL
388389
%nonassocISNULL
389-
%nonassocNULL_P
390-
%nonassocIS
390+
%nonassocISNULL_PTRUE_PFALSE_P/* sets precedence for IS NULL, etc*/
391391
%left'+''-'
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%left'*''/''%'
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%left'^'
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/* Unary Operators*/
395-
%leftAT
395+
%leftATZONE/* sets precedence for AT TIME ZONE*/
396396
%rightUMINUS
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%left'.'
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%left'['']'
@@ -4355,7 +4355,7 @@ a_expr: c_expr
43554355
{$$ = makeA_Expr(OP,$2,$1,$3); }
43564356
|Opa_expr
43574357
{$$ = makeA_Expr(OP,$1,NULL,$2); }
4358-
|a_exprOp
4358+
|a_exprOp%precPOSTFIXOP
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{$$ = makeA_Expr(OP,$2,$1,NULL); }
43604360

43614361
|a_exprANDa_expr
@@ -4463,13 +4463,13 @@ a_expr: c_expr
44634463
n->typename->typmod = -1;
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$$ = makeA_Expr(OP,"=",$1,(Node *)n);
44654465
}
4466-
|a_exprBETWEENb_exprANDb_expr
4466+
|a_exprBETWEENb_exprANDb_expr%precBETWEEN
44674467
{
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$$ = makeA_Expr(AND,NULL,
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makeA_Expr(OP,">=", $1, $3),
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makeA_Expr(OP,"<=", $1, $5));
44714471
}
4472-
|a_exprNOTBETWEENb_exprANDb_expr
4472+
|a_exprNOTBETWEENb_exprANDb_expr%precBETWEEN
44734473
{
44744474
$$ = makeA_Expr(OR,NULL,
44754475
makeA_Expr(OP,"<", $1, $4),
@@ -4529,7 +4529,7 @@ a_expr: c_expr
45294529
$$ = n;
45304530
}
45314531
}
4532-
|a_exprall_Opsub_typeselect_with_parens
4532+
|a_exprall_Opsub_typeselect_with_parens%precOp
45334533
{
45344534
SubLink *n = makeNode(SubLink);
45354535
n->lefthand = makeList1($1);
@@ -4591,7 +4591,7 @@ b_expr: c_expr
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{$$ = makeA_Expr(OP,$2,$1,$3); }
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|Opb_expr
45934593
{$$ = makeA_Expr(OP,$1,NULL,$2); }
4594-
|b_exprOp
4594+
|b_exprOp%precPOSTFIXOP
45954595
{$$ = makeA_Expr(OP,$2,$1,NULL); }
45964596
;
45974597

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