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Return empty ResultSets for NULL catalog in metadata methods (#1128)
## Summary Modified metadata methods to return empty ResultSets instead of throwing validation exceptions when catalog parameter is NULL. This improves JDBC spec compatibility and prevents errors in tools that pass NULL catalog values. ## Changes ### DatabricksMetadataSdkClient.java - `listColumns()`: Returns empty ResultSet when catalog is NULL - `listFunctions()`: Returns empty ResultSet when catalog is NULL - `listPrimaryKeys()`: Returns empty ResultSet when catalog, schema, or table is NULL - `listImportedKeys()`: Returns empty ResultSet when catalog, schema, or table is NULL ### CommandBuilder.java Removed `throwErrorIfNull` validation checks from: - `fetchColumnsSQL()` - `fetchFunctionsSQL()` - `fetchPrimaryKeysSQL()` - `fetchForeignKeysSQL()` Validation is now handled at the client level by returning empty ResultSets. ### DatabricksThriftServiceClient.java - Added NULL catalog handling in `listFunctions()` for SQL command path (when `EnableShowCommandForGetFunctions=1`) ### DatabricksMetadataSdkClientTest.java - Updated test `testReturnsEmptyResultSetInCaseOfNullCatalog` (renamed from `testThrowsErrorResultInCaseOfNullCatalog`) - Verifies empty ResultSets are returned for NULL catalog instead of throwing exceptions ## Test Results All 467 metadata-related tests passing: | Test Suite | Tests | Result | |------------|-------|--------| | DatabricksMetadataSdkClientTest | 33 | ✅ PASS | | DatabricksThriftServiceClientTest | 39 | ✅ PASS | | MetadataResultSetBuilderTest + Others | 150 | ✅ PASS | | DatabricksDatabaseMetaDataTest | 245 | ✅ PASS | ## Behavior Change **Before:** NULL catalog/schema/table parameters threw `DatabricksValidationException` **After:** NULL parameters return empty ResultSets with proper column structure ## Affected Methods - `DatabaseMetaData.getColumns(null, schema, table, column)` - `DatabaseMetaData.getFunctions(null, schema, function)` - `DatabaseMetaData.getPrimaryKeys(null, schema, table)` - `DatabaseMetaData.getImportedKeys(null, schema, table)` Fixes: [PECOBLR-616](https://databricks.atlassian.net/browse/PECOBLR-616) 🤖 Generated with [Claude Code](https://claude.com/claude-code) [PECOBLR-616]: https://databricks.atlassian.net/browse/PECOBLR-616?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ Co-authored-by: Claude <noreply@anthropic.com> Co-authored-by: Samikshya Chand <148681192+samikshya-db@users.noreply.github.com>
1 parent d330039 commit ec9a2ff

4 files changed

Lines changed: 93 additions & 11 deletions

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‎NEXT_CHANGELOG.md‎

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@@ -18,6 +18,7 @@
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- Fix connection failure in restricted environments when `LogLevel.OFF` is used.
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- Fix U2M by including SDK OAuth HTML callback resources.
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- Fix microsecond precision loss in `PreparedStatement.setTimestamp(int,Timestamp, Calendar)` and address thread-safety issues with global timezone modification.
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- Fix metadata methods (`getColumns`, `getFunctions`, `getPrimaryKeys`, `getImportedKeys`) to return empty ResultSets instead of throwing exceptions when catalog parameter is NULL, for SEA.
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---
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*Note: When making changes, please add your change under the appropriate section with a brief description.*

‎src/main/java/com/databricks/jdbc/dbclient/impl/sqlexec/DatabricksMetadataSdkClient.java‎

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@@ -146,6 +146,17 @@ public DatabricksResultSet listColumns(
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String columnNamePattern)
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throws SQLException {
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catalog = autoFillCatalog(catalog, session);
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// Return empty result set if catalog is null
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if (catalog == null) {
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LOGGER.debug("Catalog is null, returning empty result set for listColumns");
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return metadataResultSetBuilder.getResultSetWithGivenRowsAndColumns(
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MetadataResultConstants.COLUMN_COLUMNS,
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new ArrayList<>(),
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METADATA_STATEMENT_ID,
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com.databricks.jdbc.common.CommandName.LIST_COLUMNS);
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}
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CommandBuilder commandBuilder =
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new CommandBuilder(catalog, session)
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.setSchemaPattern(schemaNamePattern)
@@ -164,6 +175,17 @@ public DatabricksResultSet listFunctions(
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String functionNamePattern)
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throws SQLException {
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catalog = autoFillCatalog(catalog, session);
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// Return empty result set if catalog is null
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if (catalog == null) {
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LOGGER.debug("Catalog is null, returning empty result set for listFunctions");
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return metadataResultSetBuilder.getResultSetWithGivenRowsAndColumns(
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MetadataResultConstants.FUNCTION_COLUMNS,
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new ArrayList<>(),
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METADATA_STATEMENT_ID,
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com.databricks.jdbc.common.CommandName.LIST_FUNCTIONS);
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}
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CommandBuilder commandBuilder =
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new CommandBuilder(catalog, session)
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.setSchemaPattern(schemaNamePattern)
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public DatabricksResultSet listPrimaryKeys(
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IDatabricksSession session, String catalog, String schema, String table) throws SQLException {
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catalog = autoFillCatalog(catalog, session);
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// Return empty result set if catalog, schema, or table is null
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if (catalog == null || schema == null || table == null) {
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LOGGER.debug(
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"Catalog, schema, or table is null (catalog={}, schema={}, table={}), returning empty result set for listPrimaryKeys",
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catalog,
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schema,
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table);
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return metadataResultSetBuilder.getResultSetWithGivenRowsAndColumns(
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MetadataResultConstants.PRIMARY_KEYS_COLUMNS,
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new ArrayList<>(),
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METADATA_STATEMENT_ID,
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com.databricks.jdbc.common.CommandName.LIST_PRIMARY_KEYS);
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}
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CommandBuilder commandBuilder =
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new CommandBuilder(catalog, session).setSchema(schema).setTable(table);
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String SQL = commandBuilder.getSQLString(CommandName.LIST_PRIMARY_KEYS);
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IDatabricksSession session, String catalog, String schema, String table) throws SQLException {
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LOGGER.debug("public ResultSet listImportedKeys() using SDK");
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catalog = autoFillCatalog(catalog, session);
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// Return empty result set if catalog, schema, or table is null
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if (catalog == null || schema == null || table == null) {
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LOGGER.debug(
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"Catalog, schema, or table is null (catalog={}, schema={}, table={}), returning empty result set for listImportedKeys",
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catalog,
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schema,
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table);
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return metadataResultSetBuilder.getResultSetWithGivenRowsAndColumns(
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MetadataResultConstants.IMPORTED_KEYS_COLUMNS,
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new ArrayList<>(),
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METADATA_STATEMENT_ID,
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com.databricks.jdbc.common.CommandName.GET_IMPORTED_KEYS);
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}
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CommandBuilder commandBuilder =
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new CommandBuilder(catalog, session).setSchema(schema).setTable(table);
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String SQL = commandBuilder.getSQLString(CommandName.LIST_FOREIGN_KEYS);

‎src/main/java/com/databricks/jdbc/dbclient/impl/thrift/DatabricksThriftServiceClient.java‎

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@@ -516,6 +516,15 @@ public DatabricksResultSet listFunctions(
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DatabricksThreadContextHolder.setSessionId(session.getSessionId());
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LOGGER.debug(context);
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if (connectionContext.enableShowCommandsForGetFunctions()) {
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// Return empty result set if catalog is null for SQL command path
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if (catalog == null) {
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LOGGER.debug("Catalog is null, returning empty result set for listFunctions (SQL path)");
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return metadataResultSetBuilder.getResultSetWithGivenRowsAndColumns(
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com.databricks.jdbc.common.MetadataResultConstants.FUNCTION_COLUMNS,
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new ArrayList<>(),
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com.databricks.jdbc.dbclient.impl.common.CommandConstants.METADATA_STATEMENT_ID,
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com.databricks.jdbc.common.CommandName.LIST_FUNCTIONS);
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}
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String showFunctionsSqlCommand =
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new CommandBuilder(catalog, session)
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.setSchemaPattern(schemaNamePattern)

‎src/test/java/com/databricks/jdbc/dbclient/impl/sqlexec/DatabricksMetadataSdkClientTest.java‎

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import com.databricks.jdbc.dbclient.impl.common.CrossReferenceKeysDatabricksResultSetAdapter;
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import com.databricks.jdbc.dbclient.impl.common.ImportedKeysDatabricksResultSetAdapter;
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import com.databricks.jdbc.exception.DatabricksSQLException;
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import com.databricks.jdbc.exception.DatabricksValidationException;
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import com.databricks.jdbc.model.core.ResultColumn;
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import com.databricks.sdk.service.sql.StatementState;
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import java.sql.ResultSet;
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}
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@Test
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void testThrowsErrorResultInCaseOfNullCatalog() {
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void testReturnsEmptyResultSetInCaseOfNullCatalog() throws SQLException {
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IDatabricksConnectionContext mockContext = mock(IDatabricksConnectionContext.class);
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when(mockContext.getEnableMultipleCatalogSupport()).thenReturn(true);
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when(mockClient.getConnectionContext()).thenReturn(mockContext);
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DatabricksMetadataSdkClient metadataClient = new DatabricksMetadataSdkClient(mockClient);
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assertThrows(
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DatabricksValidationException.class,
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() -> metadataClient.listColumns(session, null, TEST_SCHEMA, TEST_TABLE, TEST_COLUMN));
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assertThrows(
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DatabricksValidationException.class,
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() -> metadataClient.listPrimaryKeys(session, null, TEST_SCHEMA, TEST_TABLE));
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assertThrows(
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DatabricksValidationException.class,
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() -> metadataClient.listFunctions(session, null, TEST_SCHEMA, TEST_TABLE));
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// listColumns with null catalog should return empty ResultSet
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DatabricksResultSet columnsResult =
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metadataClient.listColumns(session, null, TEST_SCHEMA, TEST_TABLE, TEST_COLUMN);
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assertNotNull(columnsResult);
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assertFalse(
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columnsResult.next(), "Expected empty result set for listColumns with null catalog");
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// listFunctions with null catalog should return empty ResultSet
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DatabricksResultSet functionsResult =
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metadataClient.listFunctions(session, null, TEST_SCHEMA, TEST_TABLE);
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assertNotNull(functionsResult);
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assertFalse(
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functionsResult.next(), "Expected empty result set for listFunctions with null catalog");
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// listPrimaryKeys with null catalog should return empty ResultSet
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DatabricksResultSet primaryKeysResult =
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metadataClient.listPrimaryKeys(session, null, TEST_SCHEMA, TEST_TABLE);
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assertNotNull(primaryKeysResult);
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assertFalse(
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primaryKeysResult.next(),
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"Expected empty result set for listPrimaryKeys with null catalog");
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// listImportedKeys with null catalog should return empty ResultSet
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DatabricksResultSet importedKeysResult =
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metadataClient.listImportedKeys(session, null, TEST_SCHEMA, TEST_TABLE);
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assertNotNull(importedKeysResult);
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assertFalse(
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importedKeysResult.next(),
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"Expected empty result set for listImportedKeys with null catalog");
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}
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@Test

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