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Commit2ff74ef

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Provide better message when CREATE EXTENSION can't find a target schema.
The new message (and SQLSTATE) matches the corresponding error cases innamespace.c.This was thought to be a "can't happen" case when extension.c was written,so we didn't think hard about how to report it. But it definitely canhappen in 9.2 and later, since we no longer require search_path to containany valid schema names. It's probably also possible in 9.1 if search_pathcame from a noninteractive source. So, back-patch to all releasescontaining this code.Per report from Sean Chittenden, though this isn't exactly his patch.
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‎src/backend/commands/extension.c‎

Lines changed: 7 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1391,12 +1391,16 @@ CreateExtension(CreateExtensionStmt *stmt)
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*/
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List*search_path=fetch_search_path(false);
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1394-
if (search_path==NIL)/* probably can't happen */
1395-
elog(ERROR,"there is no default creation target");
1394+
if (search_path==NIL)/* nothing valid in search_path? */
1395+
ereport(ERROR,
1396+
(errcode(ERRCODE_UNDEFINED_SCHEMA),
1397+
errmsg("no schema has been selected to create in")));
13961398
schemaOid=linitial_oid(search_path);
13971399
schemaName=get_namespace_name(schemaOid);
13981400
if (schemaName==NULL)/* recently-deleted namespace? */
1399-
elog(ERROR,"there is no default creation target");
1401+
ereport(ERROR,
1402+
(errcode(ERRCODE_UNDEFINED_SCHEMA),
1403+
errmsg("no schema has been selected to create in")));
14001404

14011405
list_free(search_path);
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}

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