Dhiraj Kumar created HIVE-15486:
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Summary: DefaultGraphWalker invokes getChildren() as many times as
there are children
Key: HIVE-15486
URL: https://issues.apache.org/jira/browse/HIVE-15486
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 2.1.0, 2.0.0
Reporter: Dhiraj Kumar
DefaultGraphWalker while walking a Node, calls up getChildren method as many
times as there are children. This leads a performance penalty where a node has
too many direct children.
Attached is query file. Instructions to run
1. time hive -f query
Checkout the time on 1.2 version vs 2.1 version.
This change was introduced in
[HIVE-11652|https://issues.apache.org/jira/browse/HIVE-11652]
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