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https://issues.apache.org/jira/browse/DRILL-7225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16832904#comment-16832904
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ASF GitHub Bot commented on DRILL-7225:
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sohami commented on pull request #1773: DRILL-7225: Fixed merging
ColumnTypeInfo for files with different schemas
URL: https://github.com/apache/drill/pull/1773
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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
> 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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