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https://issues.apache.org/jira/browse/ARROW-2296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17659323#comment-17659323
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Rok Mihevc commented on ARROW-2296:
-----------------------------------
This issue has been migrated to [issue
#18250|https://github.com/apache/arrow/issues/18250] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [Format][C++] Add num_rows to file footer
> -----------------------------------------
>
> Key: ARROW-2296
> URL: https://issues.apache.org/jira/browse/ARROW-2296
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++, Format
> Reporter: Lawrence Chan
> Priority: Minor
>
> Maybe I'm overlooking something, but I don't see something on the API surface
> to get the number of rows in a arrow file without reading all the record
> batches. This is useful when we want to read into contiguous buffers, because
> it allows us to allocate the right sizes up front.
> I'd like to propose that we add `num_rows` as a field in the file footer so
> it's easy to query without reading the whole file.
> Meanwhile, before we get that added to the official format fbs, it would be
> nice to have a method that iterates over the record batch headers and sums up
> the lengths without reading the actual record batch body.
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