Is your feature request related to a problem? Please describe.
In current implementation, only sub-process like Task (MR, Shell, Python, etc.) support Cancel (by sending 'kill -9 process_id' to kill child process).

But, for JDBC (SQL) Tasks, some SQL can be very timeconsuming, we can also implement the Cancel support to cancel mis-written SQL to reduce warehouse database workload), we can call Statement:Cancel to cancel running statement for most DBMS, we can also stop fetch more if it already comes to Fetch ResultSet stage.

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