Support lock directory table.

Support lock directory table grammar in this commit, such as:
LOCK TABLE dir_table IN ACCESS SHARE MODE;

Authored-by: Zhang Wenchao [email protected]

src/backend/commands/lockcmds.c

@@ -108,10 +108,10 @@ RangeVarCallbackForLockTable(const RangeVar *rv, Oid relid, Oid oldrelid,
 
 	/* Currently, we only allow plain tables or views to be locked */
 	if (relkind != RELKIND_RELATION && relkind != RELKIND_PARTITIONED_TABLE &&
-		relkind != RELKIND_VIEW)
+		relkind != RELKIND_VIEW && relkind != RELKIND_DIRECTORY_TABLE)
 		ereport(ERROR,
 				(errcode(ERRCODE_WRONG_OBJECT_TYPE),
-				 errmsg("\"%s\" is not a table or view",
+				 errmsg("\"%s\" is not a table, directory table or view",
 						rv->relname)));
 
 #if 0 /* Upstream code not applicable to GPDB */

src/test/regress/input/directory_table.source

@@ -236,6 +236,17 @@ SELECT count(*) FROM pg_directory_table;
 SELECT relname, relisshared, relpersistence, relkind FROM pg_class WHERE relname like '%dir_table%' ORDER BY 1;
 \c regression
 
+--Test Lock directory table
+BEGIN;
+LOCK TABLE dir_table1 IN ACCESS SHARE MODE;
+LOCK TABLE dir_table1 IN ACCESS EXCLUSIVE MODE;
+COMMIT;
+
+BEGIN;
+LOCK TABLE dir_table1 IN ACCESS SHARE MODE;
+LOCK TABLE dir_table1 IN ACCESS EXCLUSIVE MODE;
+ROLLBACK;
+
 -- Test CREATE/DROP/REINDEX on DIRECTORY SCHEMA TABLE
 -- Test CREATE INDEX on DIRECTORY SCHEMA TABLE
 CREATE INDEX dirtable1_relative_path_idx on dir_table1(relative_path);

src/test/regress/output/directory_table.source

@@ -657,6 +657,15 @@ SELECT relname, relisshared, relpersistence, relkind FROM pg_class WHERE relname
 (0 rows)
 
 \c regression
+--Test Lock directory table
+BEGIN;
+LOCK TABLE dir_table1 IN ACCESS SHARE MODE;
+LOCK TABLE dir_table1 IN ACCESS EXCLUSIVE MODE;
+COMMIT;
+BEGIN;
+LOCK TABLE dir_table1 IN ACCESS SHARE MODE;
+LOCK TABLE dir_table1 IN ACCESS EXCLUSIVE MODE;
+ROLLBACK;
 -- Test CREATE/DROP/REINDEX on DIRECTORY SCHEMA TABLE
 -- Test CREATE INDEX on DIRECTORY SCHEMA TABLE
 CREATE INDEX dirtable1_relative_path_idx on dir_table1(relative_path);