Make the EXTRACT deparse injection test detect an injected table in any schema

src/test/regress/expected/extract_deparse.out

@@ -26,9 +26,20 @@ EXCEPTION
 	WHEN invalid_parameter_value THEN NULL;
 END
 $$;
-SELECT bool_and(result::boolean) AS extract_field_injection_blocked
+-- Positive control: the same expression with a valid field must still be
+-- pushed down, so the check below cannot pass merely because the expression
+-- stopped reaching the workers.
+SELECT EXTRACT('year' FROM ts) = 2026 AS extract_field_pushdown_works
+FROM extract_deparse_source
+WHERE id = 1;
+ extract_field_pushdown_works
+---------------------------------------------------------------------
+ t
+(1 row)
+
+SELECT bool_and(result::int = 0) AS extract_field_injection_blocked
 FROM run_command_on_workers($$
-	SELECT to_regclass('extract_deparse.injected') IS NULL
+	SELECT count(*) FROM pg_class WHERE relname = 'injected'
 $$);
  extract_field_injection_blocked
 ---------------------------------------------------------------------

src/test/regress/expected/pg19.out

@@ -45,9 +45,20 @@ EXCEPTION
 	WHEN invalid_parameter_value THEN NULL;
 END
 $$;
-SELECT bool_and(result::boolean) AS extract_field_injection_blocked
+-- Positive control: the same expression with a valid field must still be
+-- pushed down, so the check below cannot pass merely because the expression
+-- stopped reaching the workers.
+SELECT EXTRACT('year' FROM ts) = 2026 AS extract_field_pushdown_works
+FROM extract_deparse_source
+WHERE id = 1;
+ extract_field_pushdown_works
+---------------------------------------------------------------------
+ t
+(1 row)
+
+SELECT bool_and(result::int = 0) AS extract_field_injection_blocked
 FROM run_command_on_workers($$
-	SELECT to_regclass('pg19_repack.injected') IS NULL
+	SELECT count(*) FROM pg_class WHERE relname = 'injected'
 $$);
  extract_field_injection_blocked
 ---------------------------------------------------------------------

src/test/regress/sql/extract_deparse.sql

@@ -25,9 +25,16 @@ EXCEPTION
 END
 $$;
 
-SELECT bool_and(result::boolean) AS extract_field_injection_blocked
+-- Positive control: the same expression with a valid field must still be
+-- pushed down, so the check below cannot pass merely because the expression
+-- stopped reaching the workers.
+SELECT EXTRACT('year' FROM ts) = 2026 AS extract_field_pushdown_works
+FROM extract_deparse_source
+WHERE id = 1;
+
+SELECT bool_and(result::int = 0) AS extract_field_injection_blocked
 FROM run_command_on_workers($$
-	SELECT to_regclass('extract_deparse.injected') IS NULL
+	SELECT count(*) FROM pg_class WHERE relname = 'injected'
 $$);
 
 SET client_min_messages TO ERROR;

src/test/regress/sql/pg19.sql

@@ -46,9 +46,16 @@ EXCEPTION
 END
 $$;
 
-SELECT bool_and(result::boolean) AS extract_field_injection_blocked
+-- Positive control: the same expression with a valid field must still be
+-- pushed down, so the check below cannot pass merely because the expression
+-- stopped reaching the workers.
+SELECT EXTRACT('year' FROM ts) = 2026 AS extract_field_pushdown_works
+FROM extract_deparse_source
+WHERE id = 1;
+
+SELECT bool_and(result::int = 0) AS extract_field_injection_blocked
 FROM run_command_on_workers($$
-	SELECT to_regclass('pg19_repack.injected') IS NULL
+	SELECT count(*) FROM pg_class WHERE relname = 'injected'
 $$);
 SET citus.shard_count TO 4;