[jira] [Commented] (DRILL-3508) IOOB raised if FROM points at an empty directory

["Sean Hsuan-Yi Chu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-3508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14635728#comment-14635728 ] 

Sean Hsuan-Yi Chu commented on DRILL-3508:
------------------------------------------

The issue originates from storage plugin. Specifically, FileSelect would attempts to use the first file for coming up with the schema in execution later.
(see FileSelect.getFirstPath)

And in case when there is not even a file, the logic above fails. 

> IOOB raised if FROM points at an empty directory
> ------------------------------------------------
>
>                 Key: DRILL-3508
>                 URL: https://issues.apache.org/jira/browse/DRILL-3508
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.1.0
>            Reporter: Stefán Baxter
>            Assignee: Sean Hsuan-Yi Chu
>             Fix For: 1.2.0
>
>
> I union select where the right hand side points to an empty directory files with the following error code:
> Error: PARSE ERROR: Index: 0, Size: 0
> [Error Id: fed7527a-9d7a-4980-80f5-ff3f0b92d49b on localhost:31010] (state=,code=0)
> We use this to merge tenant based information and sometimes there are no files on the right hand side of the union. It would be ideal that that scenario would return an empty list rather than an error.



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