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+-- Each DefineIndex() ACL check uses either the original userid or the table
+-- owner userid; see its header comment. Here, confirm that DefineIndex()
+-- uses its original userid where necessary. The test works by creating
+-- indexes that refer to as many sorts of objects as possible, with the table
+-- owner having as few applicable privileges as possible. (The privileges.sql
+-- regress_sro_user tests look for the opposite defect; they confirm that
+-- DefineIndex() uses the table owner userid where necessary.)
+SET allow_in_place_tablespaces = true;
+CREATE TABLESPACE regress_create_idx_tblspace LOCATION '';
+RESET allow_in_place_tablespaces;
+BEGIN;
+CREATE ROLE regress_minimal;
+CREATE SCHEMA s;
+CREATE EXTENSION citext SCHEMA s;
+-- Revoke all conceivably-relevant ACLs within the extension. The system
+-- doesn't check all these ACLs, but this will provide some coverage if that
+-- ever changes.
+REVOKE ALL ON TYPE s.citext FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.citext_pattern_lt FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.citext_pattern_le FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.citext_eq FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.citext_pattern_ge FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.citext_pattern_gt FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.citext_pattern_cmp FROM PUBLIC;
+-- Functions sufficient for making an index column that has the side effect of
+-- changing search_path at expression planning time.
+CREATE FUNCTION public.setter() RETURNS bool VOLATILE
+ LANGUAGE SQL AS $$SET search_path = s; SELECT true$$;
+CREATE FUNCTION s.const() RETURNS bool IMMUTABLE
+ LANGUAGE SQL AS $$SELECT public.setter()$$;
+CREATE FUNCTION s.index_this_expr(s.citext, bool) RETURNS s.citext IMMUTABLE
+ LANGUAGE SQL AS $$SELECT $1$$;
+REVOKE ALL ON FUNCTION public.setter FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.const FROM PUBLIC;
+REVOKE ALL ON FUNCTION s.index_this_expr FROM PUBLIC;
+-- Even for an empty table, expression planning calls s.const & public.setter.
+GRANT EXECUTE ON FUNCTION public.setter TO regress_minimal;
+GRANT EXECUTE ON FUNCTION s.const TO regress_minimal;
+-- Function for index predicate.
+CREATE FUNCTION s.index_row_if(s.citext) RETURNS bool IMMUTABLE
+ LANGUAGE SQL AS $$SELECT $1 IS NOT NULL$$;
+REVOKE ALL ON FUNCTION s.index_row_if FROM PUBLIC;
+-- Even for an empty table, CREATE INDEX checks ii_Predicate permissions.
+GRANT EXECUTE ON FUNCTION s.index_row_if TO regress_minimal;
+-- Non-extension, non-function objects.
+CREATE COLLATION s.coll (LOCALE="C");
+CREATE TABLE s.x (y s.citext);
+ALTER TABLE s.x OWNER TO regress_minimal;
+-- Empty-table DefineIndex()
+CREATE UNIQUE INDEX u0rows ON s.x USING btree
+ ((s.index_this_expr(y, s.const())) COLLATE s.coll s.citext_pattern_ops)
+ TABLESPACE regress_create_idx_tblspace
+ WHERE s.index_row_if(y);
+ALTER TABLE s.x ADD CONSTRAINT e0rows EXCLUDE USING btree
+ ((s.index_this_expr(y, s.const())) COLLATE s.coll WITH s.=)
+ USING INDEX TABLESPACE regress_create_idx_tblspace
+ WHERE (s.index_row_if(y));
+-- Make the table nonempty.
+INSERT INTO s.x VALUES ('foo'), ('bar');
+-- If the INSERT runs the planner on index expressions, a search_path change
+-- survives. As of 2022-06, the INSERT reuses a cached plan. It does so even
+-- under debug_discard_caches, since each index is new-in-transaction. If
+-- future work changes a cache lifecycle, this RESET may become necessary.
+RESET search_path;
+-- For a nonempty table, owner needs permissions throughout ii_Expressions.
+GRANT EXECUTE ON FUNCTION s.index_this_expr TO regress_minimal;
+CREATE UNIQUE INDEX u2rows ON s.x USING btree
+ ((s.index_this_expr(y, s.const())) COLLATE s.coll s.citext_pattern_ops)
+ TABLESPACE regress_create_idx_tblspace
+ WHERE s.index_row_if(y);
+ALTER TABLE s.x ADD CONSTRAINT e2rows EXCLUDE USING btree
+ ((s.index_this_expr(y, s.const())) COLLATE s.coll WITH s.=)
+ USING INDEX TABLESPACE regress_create_idx_tblspace
+ WHERE (s.index_row_if(y));
+-- Shall not find s.coll via search_path, despite the s.const->public.setter
+-- call having set search_path=s during expression planning. Suppress the
+-- message itself, which depends on the database encoding.
+\set VERBOSITY sqlstate
+ALTER TABLE s.x ADD CONSTRAINT underqualified EXCLUDE USING btree
+ ((s.index_this_expr(y, s.const())) COLLATE coll WITH s.=)
+ USING INDEX TABLESPACE regress_create_idx_tblspace
+ WHERE (s.index_row_if(y));
+ERROR: 42704
+\set VERBOSITY default
+ROLLBACK;
+DROP TABLESPACE regress_create_idx_tblspace;