[jira] [Commented] (ARROW-6697) [Rust] [DataFusion] Validate that all parquet partitions have the same schema

["Ruihang Xia (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-6697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17246295#comment-17246295 ] 

Ruihang Xia commented on ARROW-6697:
------------------------------------

Hi [~andygrove], I would like to implement this, but here I have two questions :P

* Should we check all schemas at the beginning and fail this read if different schemas are found, or check each schema when actually reading a partition?

* Is there a parquet file under `PARQUET_TEST_DATA` that contains different schemas in different partitions for testing?

Appreciate for anything helps.

> [Rust] [DataFusion] Validate that all parquet partitions have the same schema
> -----------------------------------------------------------------------------
>
>                 Key: ARROW-6697
>                 URL: https://issues.apache.org/jira/browse/ARROW-6697
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Rust, Rust - DataFusion
>            Reporter: Andy Grove
>            Priority: Major
>
> When reading a partitioned Parquet file in DataFusion, the schema is read from the first partition and it is assumed that all other partitions have the same schema.
> It would be better to actually validate that all of the partitions have the same schema since there is no support for schema merging yet.



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