fix: avoid send empty record batch to client #796
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Which issue does this PR close?
Closes #
Rationale for this change
Currently, empty record batch will be generated by the datafusion, and will be sent to the client too. Avoid the empty record batch because it is a waste for both server and client.
What changes are included in this PR?
SqlQueryResponse;Are there any user-facing changes?
As for the second cheanges, all the sdks has been tested for the compatibility.
How does this change test
Existing tests.