refactor: re-use CreateSourceFactory to create streams/tables for CREATE_AS statements #6594
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Description
Before this PR, the
CreateStreamCommand
creation code was redundant in theEngineExecutor.maybeCreateSinkDdl
and theCreateSourceFactory
. This PR moves the code from theEngineExecutor
to theCreateSourceFactory
to re-use part of the code there.Right now, the PR doesn't re-use code. But it will be needed by #6073 so it checks if the stream or table command exists before creating it.
Testing done
Added unit tests
Reviewer checklist