Change UseQueryForMetadata default to 1 (SHOW commands)

NEXT_CHANGELOG.md

@@ -7,6 +7,12 @@
 - Added AI coding agent detection to the User-Agent header. When the driver is invoked by a known AI coding agent (e.g. Claude Code, Cursor, Gemini CLI), `agent/<product>` is appended to the User-Agent string.
 
 ### Updated
+- **[Breaking Change]** Thrift-mode metadata operations (`getTables`, `getColumns`, `getSchemas`, `getFunctions`, `getPrimaryKeys`, `getImportedKeys`, `getCrossReference`) now use SQL SHOW commands by default instead of native Thrift RPCs, aligning behavior with SEA mode. The `UseQueryForMetadata` connection property default changed from `0` to `1`. To revert to native Thrift RPCs, set `UseQueryForMetadata=0`. Key behavioral changes:
+  - Catalog parameter is now treated as a literal identifier (not a wildcard pattern) per JDBC spec. Use `null` to search across all catalogs.
+  - Methods that previously threw exceptions for null/empty edge-case inputs now return empty result sets.
+  - `getFunctions` now works correctly (was broken via native Thrift RPC).
+  - Result columns (TABLE_CATALOG, etc.) return stored values (lowercase) instead of preserving input case.
+- Connection properties `EnableShowCommandForGetFunctions` and `TreatMetadataCatalogNameAsPattern` are now redundant when `UseQueryForMetadata=1` (the new default).
 
 ### Fixed
 - Fixed `EnableBatchedInserts` silently falling back to individual execution when table or schema names contain special characters (e.g., hyphens) inside backtick-quoted identifiers. Added a warn log when the fallback occurs.

src/main/java/com/databricks/jdbc/common/DatabricksJdbcUrlParams.java

@@ -173,7 +173,7 @@ public enum DatabricksJdbcUrlParams {
   USE_QUERY_FOR_METADATA(
       "UseQueryForMetadata",
       "Use SQL SHOW commands instead of Thrift RPCs for metadata operations. When enabled, EnableShowCommandForGetFunctions is redundant",
-      "0"),
+      "1"),
   TREAT_METADATA_CATALOG_NAME_AS_PATTERN(
       "TreatMetadataCatalogNameAsPattern",
       "Treat catalog names as patterns in Thrift metadata RPCs. When disabled (default), wildcard characters in catalog names are escaped",