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Posted to dev@parquet.apache.org by "Micah Kornfield (Jira)" <ji...@apache.org> on 2021/09/14 03:49:00 UTC
[jira] [Commented] (PARQUET-2090) [C++] Parquet writes incorrect
file_offset
[ https://issues.apache.org/jira/browse/PARQUET-2090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17414694#comment-17414694 ]
Micah Kornfield commented on PARQUET-2090:
------------------------------------------
CC [~zeroshade]
> [C++] Parquet writes incorrect file_offset
> -------------------------------------------
>
> Key: PARQUET-2090
> URL: https://issues.apache.org/jira/browse/PARQUET-2090
> Project: Parquet
> Issue Type: Bug
> Components: parquet-cpp
> Reporter: Chao Sun
> Priority: Critical
>
> Currently the Parquet writer sets {{file_offset}} in the following way (from {{metadata.cc}})
> {code:cpp}
> if (dictionary_page_offset > 0) {
> column_chunk_->meta_data.__set_dictionary_page_offset(dictionary_page_offset);
> column_chunk_->__set_file_offset(dictionary_page_offset + compressed_size);
> } else {
> column_chunk_->__set_file_offset(data_page_offset + compressed_size);
> }{code}
> This doesn't look correct, as it shouldn't take {{compressed_size}} into consideration.
> The {{file_offset}} is used when filtering row groups, and the above could cause correctness issue. See SPARK-36696.
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