[jira] [Commented] (ARROW-13609) RowGroupMetaData file_offset set incorrectly

["Micah Kornfield (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-13609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17414689#comment-17414689 ] 

Micah Kornfield commented on ARROW-13609:
-----------------------------------------

Is this a duplicate or different issue then https://issues.apache.org/jira/browse/ARROW-13941

> RowGroupMetaData file_offset set incorrectly
> --------------------------------------------
>
>                 Key: ARROW-13609
>                 URL: https://issues.apache.org/jira/browse/ARROW-13609
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Archie Menzies
>            Priority: Major
>
> It appears that the RowGroupMetaData file_offset property is being set to the same value as the first ColumnMetaData file_offset property in [https://github.com/apache/arrow/blob/8e43f23dcc6a9e630516228f110c48b64d13cec6/cpp/src/parquet/metadata.cc#L1557-L1565]
>  
> This is not consistent with the definition of these properties given in the Thrift file: [https://github.com/apache/arrow/blob/master/cpp/src/parquet/parquet.thrift]
> {code:java}
> struct ColumnChunk {
>   ...
>   /** Byte offset in file_path to the ColumnMetaData **/
>   2: required i64 file_offset
>   
>   ...
> }
> ...
> struct RowGroup {
>   ...
>   /** Byte offset from beginning of file to first page (data or dictionary)
>    * in this row group **/
>   5: optional i64 file_offset
>   ...
> }
> {code}
> This is causing issues when trying to read the file with the parquet-mr libraries, because the RowGroup's file offset is used to determine whether a RowGroup exists within a given file split: [https://github.com/apache/parquet-mr/blob/master/parquet-hadoop/src/main/java/org/apache/parquet/format/converter/ParquetMetadataConverter.java#L1226-L1251]
>  
> This issue is therefore resulting in Parquet files which cannot be read as the metadata is incorrect.



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