[jira] [Commented] (IGNITE-15004) Calcite engine. LIKE ESCAPE fails with empty escape string

["Aleksey Plekhanov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/IGNITE-15004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17397946#comment-17397946 ] 

Aleksey Plekhanov commented on IGNITE-15004:
--------------------------------------------

Some vendors don't support empty escape characters too (for example Oracle) and it's not a bug from the Calcite point of view (there is explicit check for length == 1), but our current H2 engine support it, and some other RDBMS support it (PostgreSQL, MySQL).

> Calcite engine. LIKE ESCAPE fails with empty escape string
> ----------------------------------------------------------
>
>                 Key: IGNITE-15004
>                 URL: https://issues.apache.org/jira/browse/IGNITE-15004
>             Project: Ignite
>          Issue Type: Bug
>          Components: sql
>            Reporter: Taras Ledkov
>            Priority: Major
>
> {{SELECT '%_' LIKE '%_' ESCAPE ''}}
> error:
> {code}
> class org.apache.ignite.IgniteException: Unexpected exception
> 	at org.apache.ignite.internal.processors.query.calcite.exec.ExecutionContext.lambda$execute$0(ExecutionContext.java:244)
> 	at org.apache.ignite.internal.processors.query.calcite.exec.QueryTaskExecutorImpl.lambda$execute$0(QueryTaskExecutorImpl.java:68)
> 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
> 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
> 	at java.base/java.lang.Thread.run(Thread.java:834)
> Caused by: java.lang.RuntimeException: Invalid escape character ''
> 	at org.apache.calcite.runtime.Like.invalidEscapeCharacter(Like.java:104)
> 	at org.apache.calcite.runtime.Like.sqlToRegexLike(Like.java:56)
> 	at org.apache.calcite.runtime.SqlFunctions.like(SqlFunctions.java:594)
> 	at SC.execute(Unknown Source)
> 	at org.apache.ignite.internal.processors.query.calcite.exec.exp.ExpressionFactoryImpl$ProjectImpl.apply(ExpressionFactoryImpl.java:387)
> 	at org.apache.ignite.internal.processors.query.calcite.exec.rel.ProjectNode.push(ProjectNode.java:63)
> 	at org.apache.ignite.internal.processors.query.calcite.exec.rel.ScanNode.push(ScanNode.java:107)
> 	at org.apache.ignite.internal.processors.query.calcite.exec.ExecutionContext.lambda$execute$0(ExecutionContext.java:239)
> 	... 4 more
> {code}
> Test:
> {{function/string/test_like_escape.test}}



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