Aman Sinha created DRILL-4122:
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Summary: Create unit test suite for checking quality of hashing
for hash based operators
Key: DRILL-4122
URL: https://issues.apache.org/jira/browse/DRILL-4122
Project: Apache Drill
Issue Type: Bug
Components: Functions - Drill
Affects Versions: 1.3.0
Reporter: Aman Sinha
We have encountered substantial skew in the hash based operators (hash
distribution, hash aggregation, hash join) for certain data sets. Two such
issues are DRILL-2803, DRILL-4119.
It would be very useful to have a unit test suite to test the quality of
hashing.
The number of combinations is large: num_data_types x nullability x
num_hash_function_types (32bit, 64bit, AsDouble variations). Plus, the nature
of the data itself. We would have to be judicious about picking a reasonable
subset of this space. We should also look at open source test suites in this
area.
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