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768fc0ea27
This changes the HdfsParquetTableWriter to populate the parquet::RowGroup::sorting_columns list with all columns mentioned in a 'sortby()' hint within INSERT statements. The columns are added to the list in the order in which they appear inside the hint. The change also adds backports.tempfile to the python requirements to provide 'tempfile.TemporaryDirectory' on python 2.7. The change also changes the default ordering for columns mentioned in 'sortby()' hints from descending to ascending. To test this change, we write a table with a 'sortby()' hint and verify, that the sorting_columns get populated correctly. Change-Id: Ib42aab585e9e627796e9510e783652d49d74b56c Reviewed-on: http://gerrit.cloudera.org:8080/6219 Reviewed-by: Lars Volker <lv@cloudera.com> Tested-by: Impala Public Jenkins