c31226b144
sort out the test cases of external table. After modify, there are 2 directories: 1. `external_table_p0`: all p0 cases of external tables: hive, es, jdbc and tvf 2. `external_table_p2`: all p2 cases of external tables: hive, es, mysql, pg, iceberg and tvf So that we can run it with one line command like: ``` sh run-regression-test.sh --run -d external_table_p0,external_table_p2 ```