Extend parallel_distributed_insert_select to run INSERT into local table
Before this patch there was: - parallel_distributed_insert_select=1, that executes: INSERT INTO dist_out SELECT ... FROM underlying_dist_in After this patch there will be: - parallel_distributed_insert_select=2, that executes: INSERT INTO underlying_dist_out SELECT ... FROM underlying_dist_in And cover the behaviour w/o integration test, by using the following techincs: - SYSTEM STOP DISTRIBUTED SENDS - prefer_localhost_replica=0
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