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https://issues.apache.org/jira/browse/HUDI-8333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17894046#comment-17894046
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Y Ethan Guo commented on HUDI-8333:
-----------------------------------
Functional Index works with functions on a column that is not order-preserving.
So there is no limitation of preserving orders.
> Leverage Functional index only for columns which are order preserving in the
> reader path
> ----------------------------------------------------------------------------------------
>
> Key: HUDI-8333
> URL: https://issues.apache.org/jira/browse/HUDI-8333
> Project: Apache Hudi
> Issue Type: Improvement
> Components: reader-core
> Reporter: sivabalan narayanan
> Priority: Major
> Fix For: 1.0.0
>
>
> For functional index, we should only poll predicated columns which are order
> preserving.
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