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https://issues.apache.org/jira/browse/CALCITE-3468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16966343#comment-16966343
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Chunwei Lei commented on CALCITE-3468:
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I think it is not expected behavior. We should compatible with Oracle.
> Oracle cast to varchar does not use precision when it should
> ------------------------------------------------------------
>
> Key: CALCITE-3468
> URL: https://issues.apache.org/jira/browse/CALCITE-3468
> Project: Calcite
> Issue Type: Improvement
> Reporter: Lindsey Meyer
> Priority: Major
>
> We're trying to cast a node to a varchar with something like this:
> {noformat}
> relBuilder.cast(node, SqlTypeName.VARCHAR)
> {noformat}
> And in Oracle SQL, this generates sql like
> {noformat}
> CAST(node AS VARCHAR){noformat}
> which is incorrect. Oracle can only have VARCHAR types with an explicit
> precision.
> Looking at the code, it _seems_ like this should work with Oracle, so I'm not
> really sure what's going on here
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