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Tweak parse location assignment for CURRENT_DATE and related constructs.

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All these constructs generate parse trees consisting of a Const and
a run-time type coercion (perhaps a FuncExpr or a CoerceViaIO).  Modify
the raw parse output so that we end up with the original token's location
attached to the type coercion node while the Const has location -1;
before, it was the other way around.  This makes no difference in terms
of what exprLocation() will say about the parse tree as a whole, so it
should not have any user-visible impact.  The point of changing it is that
we do not want contrib/pg_stat_statements to treat these constructs as
replaceable constants.  It will do the right thing if the Const has
location -1 rather than a valid location.

This is a pretty ugly hack, but then this code is ugly already; we should
someday replace this translation with special-purpose parse node(s) that
would allow ruleutils.c to reconstruct the original query text.

(See also commit 5d3fcc4c2e, which also
hacked location assignment rules for the benefit of pg_stat_statements.)

Back-patch to 9.2 where pg_stat_statements grew the ability to recognize
replaceable constants.

Kyotaro Horiguchi
This commit is contained in:
Tom Lane 2014-01-21 16:34:28 -05:00
parent 01f7808b3e
commit 69c7a9838c
1 changed files with 26 additions and 21 deletions
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47
src/backend/parser/gram.y
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@ -11361,10 +11361,10 @@ func_expr: func_application within_group_clause filter_clause over_clause
;
/*
* As func_expr but does not accept WINDOW functions directly (they
* can still be contained in arguments for functions etc.)
* Use this when window expressions are not allowed, so to disambiguate
* the grammar. (e.g. in CREATE INDEX)
* As func_expr but does not accept WINDOW functions directly
* (but they can still be contained in arguments for functions etc).
* Use this when window expressions are not allowed, where needed to
* disambiguate the grammar (e.g. in CREATE INDEX).
*/
func_expr_windowless:
func_application { $$ = $1; }
@ -11372,7 +11372,7 @@ func_expr_windowless:
;
/*
* Special expression
* Special expressions that are considered to be functions.
*/
func_expr_common_subexpr:
COLLATION FOR '(' a_expr ')'
@ -11397,10 +11397,15 @@ func_expr_common_subexpr:
* of type-input conversion functions. (As of PG 7.3
* that is actually possible, but not clear that we want
* to rely on it.)
*
* The token location is attached to the run-time
* typecast, not to the Const, for the convenience of
* pg_stat_statements (which doesn't want these constructs
* to appear to be replaceable constants).
*/
Node *n;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
$$ = makeTypeCast(n, SystemTypeName("date"), -1);
n = makeStringConstCast("now", -1, SystemTypeName("text"));
$$ = makeTypeCast(n, SystemTypeName("date"), @1);
}
| CURRENT_TIME
{
@ -11409,8 +11414,8 @@ func_expr_common_subexpr:
* See comments for CURRENT_DATE.
*/
Node *n;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
$$ = makeTypeCast(n, SystemTypeName("timetz"), -1);
n = makeStringConstCast("now", -1, SystemTypeName("text"));
$$ = makeTypeCast(n, SystemTypeName("timetz"), @1);
}
| CURRENT_TIME '(' Iconst ')'
{
@ -11420,10 +11425,10 @@ func_expr_common_subexpr:
*/
Node *n;
TypeName *d;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
n = makeStringConstCast("now", -1, SystemTypeName("text"));
d = SystemTypeName("timetz");
d->typmods = list_make1(makeIntConst($3, @3));
$$ = makeTypeCast(n, d, -1);
$$ = makeTypeCast(n, d, @1);
}
| CURRENT_TIMESTAMP
{
@ -11441,10 +11446,10 @@ func_expr_common_subexpr:
*/
Node *n;
TypeName *d;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
n = makeStringConstCast("now", -1, SystemTypeName("text"));
d = SystemTypeName("timestamptz");
d->typmods = list_make1(makeIntConst($3, @3));
$$ = makeTypeCast(n, d, -1);
$$ = makeTypeCast(n, d, @1);
}
| LOCALTIME
{
@ -11453,8 +11458,8 @@ func_expr_common_subexpr:
* See comments for CURRENT_DATE.
*/
Node *n;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
$$ = makeTypeCast((Node *)n, SystemTypeName("time"), -1);
n = makeStringConstCast("now", -1, SystemTypeName("text"));
$$ = makeTypeCast((Node *)n, SystemTypeName("time"), @1);
}
| LOCALTIME '(' Iconst ')'
{
@ -11464,10 +11469,10 @@ func_expr_common_subexpr:
*/
Node *n;
TypeName *d;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
n = makeStringConstCast("now", -1, SystemTypeName("text"));
d = SystemTypeName("time");
d->typmods = list_make1(makeIntConst($3, @3));
$$ = makeTypeCast((Node *)n, d, -1);
$$ = makeTypeCast((Node *)n, d, @1);
}
| LOCALTIMESTAMP
{
@ -11476,8 +11481,8 @@ func_expr_common_subexpr:
* See comments for CURRENT_DATE.
*/
Node *n;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
$$ = makeTypeCast(n, SystemTypeName("timestamp"), -1);
n = makeStringConstCast("now", -1, SystemTypeName("text"));
$$ = makeTypeCast(n, SystemTypeName("timestamp"), @1);
}
| LOCALTIMESTAMP '(' Iconst ')'
{
@ -11487,10 +11492,10 @@ func_expr_common_subexpr:
*/
Node *n;
TypeName *d;
n = makeStringConstCast("now", @1, SystemTypeName("text"));
n = makeStringConstCast("now", -1, SystemTypeName("text"));
d = SystemTypeName("timestamp");
d->typmods = list_make1(makeIntConst($3, @3));
$$ = makeTypeCast(n, d, -1);
$$ = makeTypeCast(n, d, @1);
}
| CURRENT_ROLE
{