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https://issues.apache.org/jira/browse/CALCITE-7743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18107783#comment-18107783
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Weihua Zhang commented on CALCITE-7743:
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CALCITE-5304
RelJson's another issue
> RelJson.toJson cannot emit hints
> --------------------------------
>
> Key: CALCITE-7743
> URL: https://issues.apache.org/jira/browse/CALCITE-7743
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Mihai Budiu
> Priority: Minor
>
> Attempting to serialize as JSON a plan with hints will crash the serializer.
> Reading back a plan with hints will ignore them.
> This was introduced in CALCITE-4581
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