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https://issues.apache.org/jira/browse/CALCITE-493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14247355#comment-14247355
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James Taylor commented on CALCITE-493:
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+1. This is very nice, [~julianhyde].
> Add EXTEND clause, for defining columns and their types at query/DML time
> -------------------------------------------------------------------------
>
> Key: CALCITE-493
> URL: https://issues.apache.org/jira/browse/CALCITE-493
> Project: Calcite
> Issue Type: Sub-task
> Reporter: James Taylor
> Assignee: Julian Hyde
> Labels: phoenix
> Fix For: 1.0.0-incubating
>
>
> Often times only being able to define a static schema over which to query is
> not flexible enough. It would be useful to be able to define columns and
> their type at query/DML time. For an example syntax, see
> http://phoenix.apache.org/dynamic_columns.html
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