[jira] [Commented] (PARQUET-1993) [C++] Expose when prefetching completes

["Antoine Pitrou (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-1993?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17293560#comment-17293560 ] 

Antoine Pitrou commented on PARQUET-1993:
-----------------------------------------

It may be worthwhile to step back and see what the general use case is. Is it to have full async Parquet reading?

> [C++] Expose when prefetching completes
> ---------------------------------------
>
>                 Key: PARQUET-1993
>                 URL: https://issues.apache.org/jira/browse/PARQUET-1993
>             Project: Parquet
>          Issue Type: Improvement
>          Components: parquet-cpp
>            Reporter: David Li
>            Assignee: David Li
>            Priority: Major
>
> As a follow up to PARQUET-1820, we should let an application be notified when pre-buffering has completed (e.g. PreBuffer() should return Future<void>). This would let an application pre-buffer some amount of data (across multiple files and/or row groups) and then decode data as it becomes available instead of blocking.
> A more ergonomic API would be to expose Future<RecordBatchReader> or something along those lines.



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