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https://issues.apache.org/jira/browse/CALCITE-538?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14250363#comment-14250363
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Vladimir Sitnikov commented on CALCITE-538:
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What if we generate parser only if it does not exist? (or if requested
explicitly)
> Support skip overwrite in generate-fmpp-sources
> -----------------------------------------------
>
> Key: CALCITE-538
> URL: https://issues.apache.org/jira/browse/CALCITE-538
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Vladimir Sitnikov
> Assignee: Vladimir Sitnikov
>
> fmpp should not overwrite the destination file if the contents is the same.
> Relevant issue is here: https://github.com/freemarker/fmpp/issues/11
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