Liang-Chi Hsieh created SPARK-29013:
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Summary: Structurally equivalent subexpression elimination
Key: SPARK-29013
URL: https://issues.apache.org/jira/browse/SPARK-29013
Project: Spark
Issue Type: New Feature
Components: SQL
Affects Versions: 3.0.0
Reporter: Liang-Chi Hsieh
We do semantically equivalent subexpression elimination in SparkSQL. However,
for some expressions that are not semantically equivalent, but structurally
equivalent, current subexpression elimination generates too many similar
functions. These functions share same computation structure but only differ in
input slots of current processing row.
For such expressions, we can generate just one function, and pass in input
slots during runtime.
It can reduce the length of generated code text, and save compilation time.
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