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  1. IMPALA
  2. IMPALA-4268 Rework coordinator buffering to buffer more data
  3. IMPALA-558

HS2::FetchResults sets hasMoreRows in many cases where no more rows are to be returned

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Details

    • Sub-task
    • Status: Resolved
    • Minor
    • Resolution: Won't Fix
    • Impala 1.1
    • None
    • Clients

    Description

      The first call to FetchResults always sets hasMoreRows even when 0 rows should be returned. The next call correctly sets hasMoreRows == False. The upshot is there's always an extra round-trip, although correctness isn't affected.

          execute_statement_req = TCLIService.TExecuteStatementReq()
    execute_statement_req.sessionHandle = resp.sessionHandle
    execute_statement_req.statement = "SELECT COUNT(*) FROM functional.alltypes WHERE 1 = 2"
    execute_statement_resp = self.hs2_client.ExecuteStatement(execute_statement_req)
    
    fetch_results_req = TCLIService.TFetchResultsReq()
    fetch_results_req.operationHandle = execute_statement_resp.operationHandle
    fetch_results_req.maxRows = 100
    fetch_results_resp = self.hs2_client.FetchResults(fetch_results_req)
    
    assert not fetch_results_resp.hasMoreRows # Fails

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          Improvement - An improvement or enhancement to an existing feature or task. IMPALA-4268 Rework coordinator buffering to buffer more data

          • Major - Major loss of function.
          • Resolved

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              Unassigned Unassigned
              henryr Henry Robinson
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