From: Tom Lane <tgl@sss.pgh.pa.us>
Date: Thu, 7 Apr 2011 06:34:57 +0000 (-0400)
Subject: Fix collations when we call transformWhereClause from outside the parser.
X-Git-Tag: REL9_1_BETA1~148
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d8d429890d6aa0246e28faa187a55cb0c65efd6e;p=postgresql

Fix collations when we call transformWhereClause from outside the parser.

Previous patches took care of assorted places that call transformExpr from
outside the main parser, but I overlooked the fact that some places use
transformWhereClause as a shortcut for transformExpr + coerce_to_boolean.
In particular this broke collation-sensitive index WHERE clauses, as per
report from Thom Brown.  Trigger WHEN and rule WHERE clauses too.

I'm not forcing initdb for this fix, but any affected indexes, triggers,
or rules will need to be dropped and recreated.
---

diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c
index 0af8a11b0a..329d4d95f1 100644
--- a/src/backend/commands/trigger.c
+++ b/src/backend/commands/trigger.c
@@ -36,6 +36,7 @@
 #include "optimizer/clauses.h"
 #include "optimizer/var.h"
 #include "parser/parse_clause.h"
+#include "parser/parse_collate.h"
 #include "parser/parse_func.h"
 #include "parser/parse_relation.h"
 #include "parser/parsetree.h"
@@ -282,6 +283,8 @@ CreateTrigger(CreateTrigStmt *stmt, const char *queryString,
 		whenClause = transformWhereClause(pstate,
 										  copyObject(stmt->whenClause),
 										  "WHEN");
+		/* we have to fix its collations too */
+		assign_expr_collations(pstate, whenClause);
 
 		/*
 		 * No subplans or aggregates, please
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index fe8d0c4fac..b65f5f991c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -1829,9 +1829,13 @@ transformIndexStmt(IndexStmt *stmt, const char *queryString)
 
 	/* take care of the where clause */
 	if (stmt->whereClause)
+	{
 		stmt->whereClause = transformWhereClause(pstate,
 												 stmt->whereClause,
 												 "WHERE");
+		/* we have to fix its collations too */
+		assign_expr_collations(pstate, stmt->whereClause);
+	}
 
 	/* take care of any index expressions */
 	foreach(l, stmt->indexParams)
@@ -1959,6 +1963,8 @@ transformRuleStmt(RuleStmt *stmt, const char *queryString,
 	*whereClause = transformWhereClause(pstate,
 									  (Node *) copyObject(stmt->whereClause),
 										"WHERE");
+	/* we have to fix its collations too */
+	assign_expr_collations(pstate, *whereClause);
 
 	if (list_length(pstate->p_rtable) != 2)		/* naughty, naughty... */
 		ereport(ERROR,