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Commit69c7a98

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Tweak parse location assignment for CURRENT_DATE and related constructs.
All these constructs generate parse trees consisting of a Const anda run-time type coercion (perhaps a FuncExpr or a CoerceViaIO). Modifythe raw parse output so that we end up with the original token's locationattached to the type coercion node while the Const has location -1;before, it was the other way around. This makes no difference in termsof what exprLocation() will say about the parse tree as a whole, so itshould not have any user-visible impact. The point of changing it is thatwe do not want contrib/pg_stat_statements to treat these constructs asreplaceable constants. It will do the right thing if the Const haslocation -1 rather than a valid location.This is a pretty ugly hack, but then this code is ugly already; we shouldsomeday replace this translation with special-purpose parse node(s) thatwould allow ruleutils.c to reconstruct the original query text.(See also commit5d3fcc4, which alsohacked location assignment rules for the benefit of pg_stat_statements.)Back-patch to 9.2 where pg_stat_statements grew the ability to recognizereplaceable constants.Kyotaro Horiguchi
1 parent01f7808 commit69c7a98

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‎src/backend/parser/gram.y

Lines changed: 26 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -11361,18 +11361,18 @@ func_expr: func_application within_group_clause filter_clause over_clause
1136111361
;
1136211362

1136311363
/*
11364-
* As func_expr but does not accept WINDOW functions directly (they
11365-
* can still be contained in arguments for functions etc.)
11366-
* Use this when window expressions are not allowed,so to disambiguate
11367-
* the grammar. (e.g. in CREATE INDEX)
11364+
* As func_expr but does not accept WINDOW functions directly
11365+
*(but theycan still be contained in arguments for functions etc).
11366+
* Use this when window expressions are not allowed,where needed to
11367+
*disambiguatethe grammar (e.g. in CREATE INDEX).
1136811368
*/
1136911369
func_expr_windowless:
1137011370
func_application{ $$ = $1; }
1137111371
| func_expr_common_subexpr{ $$ = $1; }
1137211372
;
1137311373

1137411374
/*
11375-
* Specialexpression
11375+
* Specialexpressions that are considered to be functions.
1137611376
*/
1137711377
func_expr_common_subexpr:
1137811378
COLLATION FOR'(' a_expr')'
@@ -11397,10 +11397,15 @@ func_expr_common_subexpr:
1139711397
* of type-input conversion functions. (As of PG 7.3
1139811398
* that is actually possible, but not clear that we want
1139911399
* to rely on it.)
11400+
*
11401+
* The token location is attached to the run-time
11402+
* typecast, not to the Const, for the convenience of
11403+
* pg_stat_statements (which doesn't want these constructs
11404+
* to appear to be replaceable constants).
1140011405
*/
1140111406
Node *n;
11402-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11403-
$$ =makeTypeCast(n,SystemTypeName("date"),-1);
11407+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
11408+
$$ =makeTypeCast(n,SystemTypeName("date"),@1);
1140411409
}
1140511410
| CURRENT_TIME
1140611411
{
@@ -11409,8 +11414,8 @@ func_expr_common_subexpr:
1140911414
* See comments for CURRENT_DATE.
1141011415
*/
1141111416
Node *n;
11412-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11413-
$$ =makeTypeCast(n,SystemTypeName("timetz"),-1);
11417+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
11418+
$$ =makeTypeCast(n,SystemTypeName("timetz"),@1);
1141411419
}
1141511420
| CURRENT_TIME'(' Iconst')'
1141611421
{
@@ -11420,10 +11425,10 @@ func_expr_common_subexpr:
1142011425
*/
1142111426
Node *n;
1142211427
TypeName *d;
11423-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11428+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
1142411429
d =SystemTypeName("timetz");
1142511430
d->typmods =list_make1(makeIntConst($3, @3));
11426-
$$ =makeTypeCast(n, d,-1);
11431+
$$ =makeTypeCast(n, d,@1);
1142711432
}
1142811433
| CURRENT_TIMESTAMP
1142911434
{
@@ -11441,10 +11446,10 @@ func_expr_common_subexpr:
1144111446
*/
1144211447
Node *n;
1144311448
TypeName *d;
11444-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11449+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
1144511450
d =SystemTypeName("timestamptz");
1144611451
d->typmods =list_make1(makeIntConst($3, @3));
11447-
$$ =makeTypeCast(n, d,-1);
11452+
$$ =makeTypeCast(n, d,@1);
1144811453
}
1144911454
| LOCALTIME
1145011455
{
@@ -11453,8 +11458,8 @@ func_expr_common_subexpr:
1145311458
* See comments for CURRENT_DATE.
1145411459
*/
1145511460
Node *n;
11456-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11457-
$$ =makeTypeCast((Node *)n,SystemTypeName("time"),-1);
11461+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
11462+
$$ =makeTypeCast((Node *)n,SystemTypeName("time"),@1);
1145811463
}
1145911464
| LOCALTIME'(' Iconst')'
1146011465
{
@@ -11464,10 +11469,10 @@ func_expr_common_subexpr:
1146411469
*/
1146511470
Node *n;
1146611471
TypeName *d;
11467-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11472+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
1146811473
d =SystemTypeName("time");
1146911474
d->typmods =list_make1(makeIntConst($3, @3));
11470-
$$ =makeTypeCast((Node *)n, d,-1);
11475+
$$ =makeTypeCast((Node *)n, d,@1);
1147111476
}
1147211477
| LOCALTIMESTAMP
1147311478
{
@@ -11476,8 +11481,8 @@ func_expr_common_subexpr:
1147611481
* See comments for CURRENT_DATE.
1147711482
*/
1147811483
Node *n;
11479-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11480-
$$ =makeTypeCast(n,SystemTypeName("timestamp"),-1);
11484+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
11485+
$$ =makeTypeCast(n,SystemTypeName("timestamp"),@1);
1148111486
}
1148211487
| LOCALTIMESTAMP'(' Iconst')'
1148311488
{
@@ -11487,10 +11492,10 @@ func_expr_common_subexpr:
1148711492
*/
1148811493
Node *n;
1148911494
TypeName *d;
11490-
n =makeStringConstCast("now",@1,SystemTypeName("text"));
11495+
n =makeStringConstCast("now",-1,SystemTypeName("text"));
1149111496
d =SystemTypeName("timestamp");
1149211497
d->typmods =list_make1(makeIntConst($3, @3));
11493-
$$ =makeTypeCast(n, d,-1);
11498+
$$ =makeTypeCast(n, d,@1);
1149411499
}
1149511500
| CURRENT_ROLE
1149611501
{

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