IMPROVMENT: Propagate database syntax errors to the frontend

[kimakan]

Currently, the following query fails with the error message There has been an server error with your job. if col is of any other type then char.

SELECT * FROM schema_name.table_name
WHERE col='somestring'

The actual error message that is returned by the PostgreSQL database is ERROR: invalid input syntax for type integer: "somestring". Ideally, this message should be propagated to the user in the "Error summary".