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https://issues.apache.org/jira/browse/DRILL-6223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16420714#comment-16420714
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ASF GitHub Bot commented on DRILL-6223:
---------------------------------------
Github user paul-rogers commented on the issue:
https://github.com/apache/drill/pull/1170
Over the last year, we've tended to favor including unit tests with each
PR. There don't seem to be any with this one, yet we are proposing to make a
fairly complex change. Perhaps tests can be added.
Further, by having good tests, we don't have to debate how Drill will
handle the scenarios discussed in an earlier comment: we just code 'em up and
try 'em out, letting Drill speak for itself. We can then decide whether or not
we like the results, rather than discussing hypotheticals.
> Drill fails on Schema changes
> ------------------------------
>
> Key: DRILL-6223
> URL: https://issues.apache.org/jira/browse/DRILL-6223
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Relational Operators
> Affects Versions: 1.10.0, 1.12.0
> Reporter: salim achouche
> Assignee: salim achouche
> Priority: Major
> Fix For: 1.14.0
>
>
> Drill Query Failing when selecting all columns from a Complex Nested Data
> File (Parquet) Set). There are differences in Schema among the files:
> * The Parquet files exhibit differences both at the first level and within
> nested data types
> * A select * will not cause an exception but using a limit clause will
> * Note also this issue seems to happen only when multiple Drillbit minor
> fragments are involved (concurrency higher than one)
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