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https://issues.apache.org/jira/browse/SPARK-49566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17899284#comment-17899284
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Daniel commented on SPARK-49566:
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I am updating this to just cover the EXTEND operator, splitting off the other
operators into separate subtasks.
> EXTEND operator
> ---------------
>
> Key: SPARK-49566
> URL: https://issues.apache.org/jira/browse/SPARK-49566
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 4.0.0
> Reporter: Daniel
> Priority: Major
> Labels: pull-request-available
>
> The EXTEND operator computes a new expression and appends it as a new column
> after the existing columns of the input table.
> The SET operator replaces a named column of the input table with the result
> of computing a new expression over each row.
> The DROP operator removes a named column of the input table, returning the
> remaining columns.
> The AS operator returns the values of the input table unmodified with a new
> table alias assigned to refer to each row.
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