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https://issues.apache.org/jira/browse/DRILL-3533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14640835#comment-14640835
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ASF GitHub Bot commented on DRILL-3533:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/drill/pull/97
> null values in a sub-structure in Parquet returns unexpected/misleading
> results
> -------------------------------------------------------------------------------
>
> Key: DRILL-3533
> URL: https://issues.apache.org/jira/browse/DRILL-3533
> Project: Apache Drill
> Issue Type: Bug
> Components: Query Planning & Optimization
> Affects Versions: 1.1.0
> Reporter: Stefán Baxter
> Assignee: Parth Chandra
> Priority: Critical
>
> With this minimal dataset as /tmp/test.json:
> {"dimensions":{"adults":"A"}}
> select lower(p.dimensions.budgetLevel) as `field1`,
> lower(p.dimensions.adults) as `field2` from dfs.tmp.`/test.json` as p;
> Returns this:
> +---------+---------+
> | field1 | field2 |
> +---------+---------+
> | null | a |
> +---------+---------+
> With the same data as a Parquet file
> CREATE TABLE dfs.tmp.`/test` AS SELECT * FROM dfs.tmp.`/test.json`;
> The same query:
> select lower(p.dimensions.budgetLevel) as `field1`,
> lower(p.dimensions.adults) as `field2` from dfs.tmp.`/test/0_0_0.parquet` as
> p;
> Return this:
> +---------+---------+
> | field1 | field2 |
> +---------+---------+
> | a | null |
> +---------+---------+
> After some more testing it appears that this has nothing to do with trim.
> (any non existing nested-value will be pushed aside)
> select p.dimensions.budgetLevel as `field1`, lower(p.dimensions.adults) as
> `field2` from dfs.tmp.`/test/0_0_0.parquet` as p;
> also returns:
> +---------+---------+
> | field1 | field2 |
> +---------+---------+
> | a | null |
> +---------+---------+
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