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Posted to reviews@spark.apache.org by GitBox <gi...@apache.org> on 2019/05/10 23:39:47 UTC
[GitHub] [spark] Achuth17 opened a new pull request #24583:
[SPARK-27679][SQL] Improve LIKE optimization
Achuth17 opened a new pull request #24583: [SPARK-27679][SQL] Improve LIKE optimization
URL: https://github.com/apache/spark/pull/24583
## What changes were proposed in this pull request?
The following improvements are possible when simplifying `LIKE` expressions -
1. In the case where pattern is `null` replace like expression with Literal(`false`), so in cases where applicable we can replace the underlying relation with `LocalRelation <empty>`.
2. Add support for underscore case optimization similar to '%'.
## How was this patch tested?
Added UTs for different cases.
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