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https://issues.apache.org/jira/browse/DRILL-3533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14637178#comment-14637178
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ASF GitHub Bot commented on DRILL-3533:
---------------------------------------
GitHub user jinfengni opened a pull request:
https://github.com/apache/drill/pull/97
DRILL-3533: Fix incorrect query result when querying parquet for fiel…
…ds that do not exists.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinfengni/incubator-drill DRILL-3533
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/97.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #97
----
commit 6bd5de9993d30e06341038c971a02287ddf06827
Author: Jinfeng Ni <[email protected]>
Date: 2015-07-22T05:00:40Z
DRILL-3533: Fix incorrect query result when querying parquet for fields
that do not exists.
----
> 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: Jinfeng Ni
> 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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