introduce metadata commands

Signed-off-by: varun-edachali-dbx <varun.edachali@databricks.com>

Author: varun-edachali-dbx

src/databricks/sql/backend/sea/utils/constants.py

@@ -45,3 +45,23 @@ class WaitTimeout(Enum):
 
     ASYNC = "0s"
     SYNC = "10s"
+
+
+class MetadataCommands(Enum):
+    """SQL commands used in the SEA backend.
+
+    These constants are used for metadata operations and other SQL queries
+    to ensure consistency and avoid string literal duplication.
+    """
+
+    SHOW_CATALOGS = "SHOW CATALOGS"
+    SHOW_SCHEMAS = "SHOW SCHEMAS IN {}"
+    SHOW_TABLES = "SHOW TABLES IN {}"
+    SHOW_TABLES_ALL_CATALOGS = "SHOW TABLES IN ALL CATALOGS"
+    SHOW_COLUMNS = "SHOW COLUMNS IN CATALOG {}"
+
+    SCHEMA_LIKE_PATTERN = " SCHEMA LIKE '{}'"
+    TABLE_LIKE_PATTERN = " TABLE LIKE '{}'"
+    LIKE_PATTERN = " LIKE '{}'"
+
+    CATALOG_SPECIFIC = "CATALOG {}"