Summary

Support specifying columns to include in the "Attach table" statement.

e.g.

To create a table named test_tbl that attaches to the path 's3://databend-toronto/1/556/' and includes only the columns col1 and col2, you can use the following SQL statement:

ATTACH TABLE `test_tbl`  (col1, col2) FROM 's3://databend-toronto/1/556/';

If the source table does not contain col1 or col2, the operation will fail.