Aman Sinha created DRILL-2900:
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Summary: Joins are not getting parallelized in TestTpchDistributed
unit tests
Key: DRILL-2900
URL: https://issues.apache.org/jira/browse/DRILL-2900
Project: Apache Drill
Issue Type: Bug
Components: Query Planning & Optimization
Affects Versions: 0.8.0
Reporter: Aman Sinha
Assignee: Jinfeng Ni
The suite of unit tests in org.apache.drill.TestTpchDistributed are supposed to
have parallel joins, parallel aggregations and sort. In order to force
parallelism, the slice_target value is set to 10 (default is 100K). However,
it looks like the plans of at least a few queries that I tried (query 03, 05,
14) did not have parallelism for the hash joins. The aggregations and sort do
have Exchanges, so they are getting parallelized.
There is a likelihood that many plans have BroadcastExchange on the right
input of the join and since the left input of the join is typically a single
file we may be dropping the exchange on the right input. This should be fixed.
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