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https://issues.apache.org/jira/browse/DRILL-6962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva updated DRILL-6962:
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Reviewer: Volodymyr Vysotskyi
> 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
> 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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