[jira] [Created] (BEAM-9879) Support STRING_AGG in BeamSQL

["Rui Wang (Jira)" <ji...@apache.org>]

Rui Wang created BEAM-9879:
------------------------------

             Summary: 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


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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