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Fix deparsing of ON CONFLICT arbiter WHERE clauses. 

The parser doesn't allow qualification of column names appearing in
these clauses, but ruleutils.c would sometimes qualify them, leading
to dump/reload failures.  Per bug #13891 from Onder Kalaci.

(In passing, make stanzas in ruleutils.c that save/restore varprefix
more consistent.)

Peter Geoghegan
This commit is contained in:
Tom Lane 2016-02-07 14:57:24 -05:00
parent 1d76c97250
commit cc2ca9319a
2 changed files with 18 additions and 5 deletions
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19
src/backend/utils/adt/ruleutils.c
View File

@ -5532,9 +5532,21 @@ get_insert_query_def(Query *query, deparse_context *context)
/* Add a WHERE clause (for partial indexes) if given */
if (confl->arbiterWhere != NULL)
{
bool save_varprefix;
/*
* Force non-prefixing of Vars, since parser assumes that they
* belong to target relation. WHERE clause does not use
* InferenceElem, so this is separately required.
*/
save_varprefix = context->varprefix;
context->varprefix = false;
appendContextKeyword(context, " WHERE ",
-PRETTYINDENT_STD, PRETTYINDENT_STD, 1);
get_rule_expr(confl->arbiterWhere, context, false);
context->varprefix = save_varprefix;
}
}
else if (confl->constraint != InvalidOid)
@ -7956,13 +7968,14 @@ get_rule_expr(Node *node, deparse_context *context,
case T_InferenceElem:
{
InferenceElem *iexpr = (InferenceElem *) node;
bool varprefix = context->varprefix;
bool save_varprefix;
bool need_parens;
/*
* InferenceElem can only refer to target relation, so a
* prefix is never useful.
* prefix is not useful, and indeed would cause parse errors.
*/
save_varprefix = context->varprefix;
context->varprefix = false;
/*
@ -7982,7 +7995,7 @@ get_rule_expr(Node *node, deparse_context *context,
if (need_parens)
appendStringInfoChar(buf, ')');
context->varprefix = varprefix;
context->varprefix = save_varprefix;
if (iexpr->infercollid)
appendStringInfo(buf, " COLLATE %s",

4
src/test/regress/expected/rules.out
View File

@ -2846,7 +2846,7 @@ SELECT definition FROM pg_rules WHERE tablename = 'hats' ORDER BY rulename;
CREATE RULE hat_nosert AS +
ON INSERT TO hats DO INSTEAD INSERT INTO hat_data (hat_name, hat_color) +
VALUES (new.hat_name, new.hat_color) ON CONFLICT(hat_name COLLATE "C" bpchar_pattern_ops)+
WHERE (hat_data.hat_color = 'green'::bpchar) DO NOTHING +
WHERE (hat_color = 'green'::bpchar) DO NOTHING +
RETURNING hat_data.hat_name, +
hat_data.hat_color;
(1 row)
@ -2871,7 +2871,7 @@ SELECT tablename, rulename, definition FROM pg_rules
hats | hat_nosert | CREATE RULE hat_nosert AS +
| | ON INSERT TO hats DO INSTEAD INSERT INTO hat_data (hat_name, hat_color) +
| | VALUES (new.hat_name, new.hat_color) ON CONFLICT(hat_name COLLATE "C" bpchar_pattern_ops)+
| | WHERE (hat_data.hat_color = 'green'::bpchar) DO NOTHING +
| | WHERE (hat_color = 'green'::bpchar) DO NOTHING +
| | RETURNING hat_data.hat_name, +
| | hat_data.hat_color;
(1 row)