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https://issues.apache.org/jira/browse/SPARK-27679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Achuth Narayan Rajagopal updated SPARK-27679:
---------------------------------------------
Description:
The following improvements are possible when simplifying {{LIKE}} expressions
by adding support for underscore case optimization similar to '%' :
{code:java}
1. Filter name#10 LIKE _abc → Filter (length(name#10) = 4 && EndsWith(name#10,
abc))
2. Filter name#10 LIKE abc_ → Filter (length(name#10) = 4 &&
StartsWith(name#10, abc))
3. Filter name#10 LIKE abc_def -> Filter ((length(name#10) = 7) &&
(StartsWith(name#10, abc) && EndsWith(name#10, def)))
{code}
was:
The following improvements are possible when simplifying {{LIKE}} expressions
by adding support for underscore case optimization similar to '%' :
{{ Filter name#10 LIKE _abc → Filter (length(name#10) = 4 && EndsWith(name#10,
abc))}}
{{Filter name#10 LIKE abc_ → Filter (length(name#10) = 4 && StartsWith(name#10,
abc))}}
{{Filter name#10 LIKE abc_def -> Filter ((length(name#10) = 7) &&
(StartsWith(name#10, abc) && EndsWith(name#10, def))) }}
> Improve queries with LIKE expression
> ------------------------------------
>
> Key: SPARK-27679
> URL: https://issues.apache.org/jira/browse/SPARK-27679
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.4.3
> Reporter: Achuth Narayan Rajagopal
> Priority: Major
>
> The following improvements are possible when simplifying {{LIKE}} expressions
> by adding support for underscore case optimization similar to '%' :
>
> {code:java}
> 1. Filter name#10 LIKE _abc → Filter (length(name#10) = 4 &&
> EndsWith(name#10, abc))
> 2. Filter name#10 LIKE abc_ → Filter (length(name#10) = 4 &&
> StartsWith(name#10, abc))
> 3. Filter name#10 LIKE abc_def -> Filter ((length(name#10) = 7) &&
> (StartsWith(name#10, abc) && EndsWith(name#10, def)))
> {code}
>
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