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https://issues.apache.org/jira/browse/HUDI-9543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17985045#comment-17985045
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Y Ethan Guo commented on HUDI-9543:
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Could we use the Null character (ASCII 0) for better readability and the same
escape trick for encoding?
> Secondary index does not handle null char properly
> --------------------------------------------------
>
> Key: HUDI-9543
> URL: https://issues.apache.org/jira/browse/HUDI-9543
> Project: Apache Hudi
> Issue Type: Bug
> Components: index
> Affects Versions: 1.1.0
> Reporter: Davis Zhang
> Assignee: Davis Zhang
> Priority: Critical
>
> If secondary key column contains null, the SI does not track those records.
>
> Plan: Escape some char and use the unescaped version as the note for null str
> Use "`" to represent null
> for normal string, escape "`" to "`1"
> Make sure reader and writer path works for this
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