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https://issues.apache.org/jira/browse/CALCITE-4753?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17403968#comment-17403968
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Julian Hyde commented on CALCITE-4753:
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It doesn't make sense. FunctionContext is used at prepare time. DataContext is
around at execute time. If the query is executed several times, the function
might be executed against several DataContext instances.
> Extend FunctionContext with a DataContext getter
> ------------------------------------------------
>
> Key: CALCITE-4753
> URL: https://issues.apache.org/jira/browse/CALCITE-4753
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Paweł Łoziński
> Priority: Major
>
> Certain functions may need access to information stored in the DataContext
> during execution. Since it is already present in FunctionContext
> implementation, the proposal would be to expose it via a getter.
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