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IMPALA-4794 changed the distinct aggregation behavior to shuffling by both grouping exprs and the distinct expr. It's slower in queries where the NDVs of grouping exprs are high and data are uniformly distributed among groups. This patch adds a query option controlling this behavior, letting users switch to the old plan. Change-Id: Icb4b4576fb29edd62cf4b4ba0719c0e0a2a5a8dc Reviewed-on: http://gerrit.cloudera.org:8080/9949 Reviewed-by: Tianyi Wang <twang@cloudera.com> Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
This directory contains Impala test workloads. The directory layout for the workloads should follow: workloads/ <data set name>/<data set name>_dimensions.csv <- The test dimension file <data set name>/<data set name>_core.csv <- A test vector file <data set name>/<data set name>_pairwise.csv <data set name>/<data set name>_exhaustive.csv <data set name>/queries/<query test>.test <- The queries for this workload