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https://issues.apache.org/jira/browse/BEAM-9879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17473068#comment-17473068
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Beam JIRA Bot commented on BEAM-9879:
-------------------------------------
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> 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: P3
> Fix For: Not applicable
>
>
> 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
> {code:sql}
> SELECT
> STRING_AGG(c) str_agg_unary,
> STRING_AGG(c, ", ") str_agg_binary,
> STRING_AGG(d) bytes_agg_unary,
> STRING_AGG(d, b", ") bytes_agg_binary
> {code}
> More test cases here:
> https://github.com/google/zetasql/blob/c55f967a5ae35b476437210c529691d8a73f5507/zetasql/compliance/testdata/aggregation_queries.test
> 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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