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SELECT ARRAY_AGG(1) b FROM UNNEST([1, 2, 3]) a
https://github.com/apache/beam/blob/f2468baf6224127634d0d5ab03a9fdd730bb8dfe/sdks/java/extensions/sql/zetasql/src/main/java/org/apache/beam/sdk/extensions/sql/zetasql/translation/AggregateScanConverter.java#L245