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https://issues.apache.org/jira/browse/BEAM-9969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17157533#comment-17157533
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Kyle Weaver commented on BEAM-9969:
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[~amaliujia] can we mark this as done?
> Beam ZetaSQL supports pure SQL user-defined table functions
> -----------------------------------------------------------
>
> Key: BEAM-9969
> URL: https://issues.apache.org/jira/browse/BEAM-9969
> Project: Beam
> Issue Type: Task
> Components: dsl-sql-zetasql
> Reporter: Rui Wang
> Priority: P2
> Labels: stale-P2
>
> There are four types of implementation of table-valued function:
> 1. FixedSchemaOutput. The output of the TVF is pre-defined.
> 2. InputSchemaForwardToOutput. The output schema of the TVF is the same as
> input schema.
> 3. InputSchemaForwardToOutputWithAppendedColumns. The output schema of the
> TVF is the same as input schema plus columns appended.
> 4. TemplatedTVF. Parameters of TVF are templated. (e.g. ANY TYPE, ANY TABLE,
> etc.)
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