Dongjoon Hyun created SPARK-14545:
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Summary: Improve `LikeSimplification` by adding `a%b` rule
Key: SPARK-14545
URL: https://issues.apache.org/jira/browse/SPARK-14545
Project: Spark
Issue Type: New Feature
Components: Optimizer
Reporter: Dongjoon Hyun
Current `LikeSimplification` handles the following four rules.
- 'a%' => expr.StartsWith("a")
- '%b' => expr.EndsWith("b")
- '%a%' => expr.Contains("a")
- 'a' => EqualTo("a")
This issue adds the following rule.
- 'a%b' => expr.Length() > 2 && expr.StartsWith("a") && expr.EndsWith("b")
Here, 2 is statically calculated from "a".size + "b".size.
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