Jiabao Sun created CALCITE-6008:
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Summary: ARRAY_AGG should returns ARRAY nullable.
Key: CALCITE-6008
URL: https://issues.apache.org/jira/browse/CALCITE-6008
Project: Calcite
Issue Type: Bug
Reporter: Jiabao Sun
ARRAY_AGG in BigQuery and Postgres returns NULL if there are zero input rows or
expression evaluates to NULL for all rows.
However, it will return `ARRAY<arg0> NOT NULL` in the return type of the
function definition.
[https://cloud.google.com/bigquery/docs/reference/standard-sql/aggregate_functions#array_agg]
[https://www.postgresql.org/docs/8.4/functions-aggregate.html]
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