[jira] [Closed] (DRILL-6962) Function coalesce returns an Error when none of the columns in coalesce exist in a parquet file

["Anton Gozhiy (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DRILL-6962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Anton Gozhiy closed DRILL-6962.
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> Function coalesce returns an Error when none of the columns in coalesce exist in a parquet file
> -----------------------------------------------------------------------------------------------
>
>                 Key: DRILL-6962
>                 URL: https://issues.apache.org/jira/browse/DRILL-6962
>             Project: Apache Drill
>          Issue Type: Improvement
>    Affects Versions: 1.13.0
>            Reporter: Bohdan Kazydub
>            Assignee: Bohdan Kazydub
>            Priority: Major
>              Labels: ready-to-commit
>             Fix For: 1.16.0
>
>
> As Drill is schema-free, COALESCE function is expected to return a result and not error out even if none of the columns being referred to exists in files being queried.
> Here is an example for 2 columns, `unk_col` and `unk_col2`, which do not exist in the parquet files
> {code:java}
> select coalesce(unk_col, unk_col2) from dfs.`/tmp/parquetfiles`;
> java.lang.IndexOutOfBoundsException: index (0) must be less than size (0)
> at org.apache.drill.shaded.guava.com.google.common.base.Preconditions.checkElementIndex(Preconditions.java:1196)
> Fragment 1:0
> [Error Id: 7b9193fb-289b-4fbf-a52a-2b93b01f0cd0 on dkvm2c:31010] (state=,code=0)
> {code}



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