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https://issues.apache.org/jira/browse/DRILL-7225?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16829859#comment-16829859
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Venkata Jyothsna Donapati commented on DRILL-7225:
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[~amansinha100] Case-2 results in NPE. Case-1 works fine which means there
won't be any problem when two sub-directories under a directory have different
schemas.
> 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
>
> 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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