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https://issues.apache.org/jira/browse/DRILL-1613?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14190749#comment-14190749
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Hanifi Gunes commented on DRILL-1613:
-------------------------------------
Will be fixed once DRILL-1324 is in.
> Drill does not honor nested schema changes
> ------------------------------------------
>
> Key: DRILL-1613
> URL: https://issues.apache.org/jira/browse/DRILL-1613
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Hanifi Gunes
> Assignee: Hanifi Gunes
>
> Drill's current definition of schema change is an incremental update to the
> top-level schema structure. This is inappropriate for complex data types
> where schema change may occur at any level in the hierarchy of vectors.
> Current design does not fit into this requirement neatly as only top-level
> containers are able to mutate the schema. We need a minor to major re-design
> to handle this situation.
> This issue exacerbates when querying partitions or batches of files that do
> not necessarily conform to the exact same schema. New fields from upcoming
> batches will be omitted in either case.
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