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From "Khurram Faraaz (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DRILL-3805) Empty JSON on LHS UNION non empty JSON on RHS must return results
Date Wed, 18 Nov 2015 20:45:11 GMT

     [ https://issues.apache.org/jira/browse/DRILL-3805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Khurram Faraaz updated DRILL-3805:
----------------------------------
    Priority: Critical  (was: Minor)

> Empty JSON on LHS UNION non empty JSON on RHS must return results
> -----------------------------------------------------------------
>
>                 Key: DRILL-3805
>                 URL: https://issues.apache.org/jira/browse/DRILL-3805
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Execution - Relational Operators
>    Affects Versions: 1.2.0
>            Reporter: Khurram Faraaz
>            Priority: Critical
>             Fix For: Future
>
>
> When the input on LHS of UNION operator is empty and there is non empty input on RHS
of Union, we need to return the data from the RHS. Currently we return SchemaChangeException.
> {code}
> 0: jdbc:drill:schema=dfs.tmp> select key1 from `empty.json` UNION select key1 from
`fewRows.json`;
> Error: SYSTEM ERROR: SchemaChangeException: The left input of Union-All should not come
from an empty data source
> Fragment 0:0
> [Error Id: f0fcff87-f470-46a8-9733-316b7da1a87f on centos-02.qa.lab:31010] (state=,code=0)
> {code}



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