Revert "fix to do GetOperationStatus once (this is trigger of actual query execution?)"

This reverts commit d9f40d7863186e768417ed96bf79f0567e8b711a.
Revert "fix to return blank-response correctly"

This reverts commit 031e6bbd5b78c2d213be1134d599003c80e3157a.
Revert "purge _waitComplete because GetOperationStatus doesnt work correctly"

This reverts commit 406cb1cdb51f9e4c8d128979c5d8ea82b5833485.