Liang-Chi Hsieh created SPARK-19902:
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Summary: Support more expression canonicalization: Add, Subtract,
Multiply and Divide
Key: SPARK-19902
URL: https://issues.apache.org/jira/browse/SPARK-19902
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.1.0
Reporter: Liang-Chi Hsieh
Current expression canonicalization can't support even simple cases like a + b
- b and a which are semantically equal. Since expression canonicalization is
used across Spark SQL, more supports can be useful.
This patch adds more expression canonicalization support. In particular, it
supports the expressions composed of combination of Add and Subtract, and
combination of Multiply and Divide.
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