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Posted to issues@drill.apache.org by "Robert Hou (JIRA)" <ji...@apache.org> on 2019/05/23 23:43:00 UTC
[jira] [Closed] (DRILL-7225) Merging of columnTypeInfo for file
with different schema throws NullPointerException during refresh metadata
[ https://issues.apache.org/jira/browse/DRILL-7225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Robert Hou closed DRILL-7225.
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> Merging of columnTypeInfo for file with different schema throws NullPointerException during refresh metadata
> ------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-7225
> URL: https://issues.apache.org/jira/browse/DRILL-7225
> Project: Apache Drill
> Issue Type: Bug
> Components: Metadata
> Affects Versions: 1.16.0
> Reporter: Venkata Jyothsna Donapati
> Assignee: Venkata Jyothsna Donapati
> Priority: Major
> Labels: ready-to-commit
> Fix For: 1.17.0
>
>
> Merging of columnTypeInfo from two files with different schemas throws nullpointerexception. For example if a directory Orders has two files:
> * orders.parquet (with columns order_id, order_name, order_date)
> * orders_with_address.parquet (with columns order_id, order_name, address)
> When refresh table metadata is triggered, metadata such as total_null_count for columns in both the files is aggregated and updated in the ColumnTypeInfo. Initially ColumnTypeInfo is initialized with the first file's ColumnTypeInfo (i.e., order_id, order_name, order_date). While aggregating, the existing ColumnTypeInfo is looked up for columns in the second file and since some of them don't exist in the ColumnTypeInfo, a npe is thrown. This can be fixed by initializing ColumnTypeInfo for columns that are not yet present.
>
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