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https://issues.apache.org/jira/browse/SPARK-14545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Reynold Xin resolved SPARK-14545.
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Resolution: Fixed
Assignee: Dongjoon Hyun
Fix Version/s: 2.0.0
> 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
> Assignee: Dongjoon Hyun
> Fix For: 2.0.0
>
>
> 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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