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The reported issue is that we can have redundant hash expressions in exchanges. The underlying cause is that we fail to remove redundant join predicates. This patch enforces slot equivalences based on our computed equivalence classes at the lowest possible plan node by generating new equality predicates. Each plan subtree now has a minimal set of equality predicates that express all known equivalences between slots belonging to tuples materialized at that plan node. As a result, eliminating redundant join predicates becomes trivial: It is sufficient to pick a single representative predicate of each relevant equivalence class. All predicates beyond that are redundant. Change-Id: I7998fe8d7bdf84cc8eb129d32c86269bedeab68e Reviewed-on: http://gerrit.ent.cloudera.com:8080/2177 Reviewed-by: Alex Behm <alex.behm@cloudera.com> Tested-by: jenkins Reviewed-on: http://gerrit.ent.cloudera.com:8080/2278
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