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Fix the code that adds regclass constants to a plan's list of relation OIDs 

that it depends on for replan-forcing purposes.  We need to consider plain OID
constants too, because eval_const_expressions folds a RelabelType atop a Const
to just a Const.  This change could result in OID values that aren't really
for tables getting added to the dependency list, but the worst-case
consequence would be occasional useless replans.  Per report from Gabriele
Messineo.
This commit is contained in:
Tom Lane 2008-06-17 14:51:32 +00:00
parent 19a6bace94
commit 2e835a4961
1 changed files with 16 additions and 5 deletions
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21
src/backend/optimizer/plan/setrefs.c
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@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.141 2008/01/01 19:45:50 momjian Exp $
* $PostgreSQL: pgsql/src/backend/optimizer/plan/setrefs.c,v 1.142 2008/06/17 14:51:32 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -63,6 +63,17 @@ typedef struct
int rtoffset;
} fix_upper_expr_context;
/*
* Check if a Const node is a regclass value. We accept plain OID too,
* since a regclass Const will get folded to that type if it's an argument
* to oideq or similar operators. (This might result in some extraneous
* values in a plan's list of relation dependencies, but the worst result
* would be occasional useless replans.)
*/
#define ISREGCLASSCONST(con) \
(((con)->consttype == REGCLASSOID || (con)->consttype == OIDOID) && \
!(con)->constisnull)
#define fix_scan_list(glob, lst, rtoffset) \
((List *) fix_scan_expr(glob, (Node *) (lst), rtoffset))
@ -694,7 +705,7 @@ fix_scan_expr_mutator(Node *node, fix_scan_expr_context *context)
Const *con = (Const *) node;
/* Check for regclass reference */
if (con->consttype == REGCLASSOID && !con->constisnull)
if (ISREGCLASSCONST(con))
context->glob->relationOids =
lappend_oid(context->glob->relationOids,
DatumGetObjectId(con->constvalue));
@ -722,7 +733,7 @@ fix_scan_expr_walker(Node *node, fix_scan_expr_context *context)
Const *con = (Const *) node;
/* Check for regclass reference */
if (con->consttype == REGCLASSOID && !con->constisnull)
if (ISREGCLASSCONST(con))
context->glob->relationOids =
lappend_oid(context->glob->relationOids,
DatumGetObjectId(con->constvalue));
@ -1391,7 +1402,7 @@ fix_join_expr_mutator(Node *node, fix_join_expr_context *context)
Const *con = (Const *) node;
/* Check for regclass reference */
if (con->consttype == REGCLASSOID && !con->constisnull)
if (ISREGCLASSCONST(con))
context->glob->relationOids =
lappend_oid(context->glob->relationOids,
DatumGetObjectId(con->constvalue));
@ -1489,7 +1500,7 @@ fix_upper_expr_mutator(Node *node, fix_upper_expr_context *context)
Const *con = (Const *) node;
/* Check for regclass reference */
if (con->consttype == REGCLASSOID && !con->constisnull)
if (ISREGCLASSCONST(con))
context->glob->relationOids =
lappend_oid(context->glob->relationOids,
DatumGetObjectId(con->constvalue));