[jira] [Commented] (PARQUET-138) Parquet should allow a merge between required and optional schemas

["Nicolas Trinquier (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PARQUET-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16686257#comment-16686257 ] 

Nicolas Trinquier commented on PARQUET-138:
-------------------------------------------

[~rdblue] [~rjustice] this is still relevant right? If so I'd like to see if I can contribute :)

> Parquet should allow a merge between required and optional schemas
> ------------------------------------------------------------------
>
>                 Key: PARQUET-138
>                 URL: https://issues.apache.org/jira/browse/PARQUET-138
>             Project: Parquet
>          Issue Type: Bug
>          Components: parquet-mr
>    Affects Versions: 1.6.0
>            Reporter: Robert Justice
>            Priority: Major
>
> In discussion with Ryan, he felt we should be able to merge from required binary to optional binary and the resulting schema would be optional
> https://github.com/Parquet/parquet-mr/blob/master/parquet-column/src/test/java/parquet/schema/TestMessageType.java
> {code:java}
> try {
>       t3.union(t4);
>       fail("moving from optional to required");
>     } catch (IncompatibleSchemaModificationException e) {
>       assertEquals("repetition constraint is more restrictive: can not merge type required binary a into optional binary a", e.getMessage());
>     }
> {code}



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