[jira] [Resolved] (IMPALA-558) HS2::FetchResults sets hasMoreRows in many cases where no more rows are to be returned

["Sahil Takiar (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-558?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sahil Takiar resolved IMPALA-558.
---------------------------------
    Resolution: Won't Fix

Marking this as "Won't Fix" since it is not a major issue, and fixing this require a decent amount of code re-factoring. Furthermore, clients that enable result spooling should see this issue significantly less.

> HS2::FetchResults sets hasMoreRows in many cases where no more rows are to be returned
> --------------------------------------------------------------------------------------
>
>                 Key: IMPALA-558
>                 URL: https://issues.apache.org/jira/browse/IMPALA-558
>             Project: IMPALA
>          Issue Type: Sub-task
>          Components: Clients
>    Affects Versions: Impala 1.1
>            Reporter: Henry Robinson
>            Priority: Minor
>              Labels: query-lifecycle
>
> 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.
> {code}
>     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
> {code}



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