Fix tests for fallback logic in getExportedKeys

Author: keshavdandeva

java-bigquery-jdbc/src/test/java/com/google/cloud/bigquery/jdbc/BigQueryDatabaseMetaDataTest.java

@@ -3505,7 +3505,7 @@ public void testGetExportedKeys_hasKeys() throws SQLException {
     mockDatasetIteration(datasetId);
     mockTableIteration(datasetId, mockTableP);
 
-    try (ResultSet rs = dbMetadata.getExportedKeys("test-project", "dataset_p", "ref_table")) {
+    try (ResultSet rs = dbMetadata.getExportedKeys("test-project", null, "ref_table")) {
       assertTrue(rs.next());
       assertEquals("test-project", rs.getString("PKTABLE_CAT"));
       assertEquals("dataset_p", rs.getString("PKTABLE_SCHEM"));
@@ -3541,7 +3541,7 @@ public void testGetExportedKeys_noKeys() throws SQLException {
     mockDatasetIteration(datasetId);
     mockTableIteration(datasetId, mockTableP);
 
-    try (ResultSet rs = dbMetadata.getExportedKeys("test-project", "dataset_p", "ref_table")) {
+    try (ResultSet rs = dbMetadata.getExportedKeys("test-project", null, "ref_table")) {
       assertFalse(rs.next());
     }
   }