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https://issues.apache.org/jira/browse/DRILL-5179?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578123#comment-16578123
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mehran commented on DRILL-5179:
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It is convenient to have a skip_null_columns in parquet.writer.
> Dropping NULL Columns from putting in parquet files
> ---------------------------------------------------
>
> Key: DRILL-5179
> URL: https://issues.apache.org/jira/browse/DRILL-5179
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.9.0
> Reporter: mehran
> Priority: Major
>
> Due to schemaless nature of drill and parquet files. It is suitable that all
> NULL columns be dropped in "CREATE TABLE" command from json. This will
> enhance speed of header interpretation. I think this is a big enhancement.
> This can be an option in configuration parameters.
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