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https://issues.apache.org/jira/browse/NIFI-14426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17943562#comment-17943562
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David Handermann commented on NIFI-14426:
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One very important thing to note when it comes to reading the InputStream from
the FlowFile is that doing something like content type detection reads from the
stream. Using the PushbackInputStream to "unread" some number of bytes may be
necessary for proper behavior.
> Add support for HSSF format in ExcelReader processor
> ----------------------------------------------------
>
> Key: NIFI-14426
> URL: https://issues.apache.org/jira/browse/NIFI-14426
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Extensions
> Reporter: Piotr Zalas
> Assignee: Piotr Zalas
> Priority: Major
>
> Currently ExcelReader processor supports only files in new XSSF (.xlsx)
> format. Add support for legacy HSSF (.xls) format.
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