Ke Jia created HIVE-17139:
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Summary: Conditional expressions optimization: skip the expression
evaluation if the condition is not satisfied for vectorization engine.
Key: HIVE-17139
URL: https://issues.apache.org/jira/browse/HIVE-17139
Project: Hive
Issue Type: Improvement
Reporter: Ke Jia
Assignee: Ke Jia
The case when and if statement execution for Hive vectorization is not optimal,
which all the conditional and else expressions are evaluated for current
implementation. The optimized approach is to update the selected array of batch
parameter after the conditional expression is executed. Then the else
expression will only do the selected rows instead of all.
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