[
https://issues.apache.org/jira/browse/ARROW-13941?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Chao Sun updated ARROW-13941:
-----------------------------
Description:
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.
was:
Currently the Parquet writer sets {{file_offset}} in the following way:
{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.
> [C++] Parquet writes incorrect file_offset
> -------------------------------------------
>
> Key: ARROW-13941
> URL: https://issues.apache.org/jira/browse/ARROW-13941
> Project: Apache Arrow
> Issue Type: Bug
> Components: Parquet
> 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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