[jira] [Updated] (DRILL-3533) null values in a sub-structure in Parquet returns unexpected/misleading results

["Parth Chandra (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-3533?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Parth Chandra updated DRILL-3533:
---------------------------------
    Assignee: Hanifi Gunes  (was: Jinfeng Ni)

> 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: Hanifi Gunes
>            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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