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https://issues.apache.org/jira/browse/BEAM-9879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17099255#comment-17099255
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Rui Wang commented on BEAM-9879:
--------------------------------
A good reference of implementation is what is done in
https://issues.apache.org/jira/browse/BEAM-9418
(https://github.com/apache/beam/pull/11333)
> Support STRING_AGG in BeamSQL
> -----------------------------
>
> Key: BEAM-9879
> URL: https://issues.apache.org/jira/browse/BEAM-9879
> Project: Beam
> Issue Type: Task
> Components: dsl-sql, dsl-sql-zetasql
> Reporter: Rui Wang
> Priority: Major
>
> Support STRING_AGG function in ZetaSQL dialect. (Also if Calcite has this
> function built-in, support it in Calcite dialect too)
> See the reference:
> https://cloud.google.com/bigquery/docs/reference/standard-sql/aggregate_functions#string_agg
> Examples:
> {code:sql}
> SELECT STRING_AGG(fruit) AS string_agg
> FROM UNNEST(["apple", NULL, "pear", "banana", "pear"]) AS fruit;
> +------------------------+
> | string_agg |
> +------------------------+
> | apple,pear,banana,pear |
> +------------------------+
> {code}
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