re-enable `fieldNull` SQL Type check in `meta_queries_test.cpp` this is to be done after [BUG: NULL Columns passed as VARCHAR to Calcite, ResultSetMetadata for queries reports NULL columns as VARCHAR](https://github.com/aws/amazon-documentdb-jdbc-driver/issues/498)
re-enable
fieldNullSQL Type check inmeta_queries_test.cppthis is to be done after BUG: NULL Columns passed as VARCHAR to Calcite, ResultSetMetadata for queries reports NULL columns as VARCHAR