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https://issues.apache.org/jira/browse/CALCITE-6008?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mihai Budiu resolved CALCITE-6008.
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Fix Version/s: 1.38.0
Resolution: Fixed
Fixed in
https://github.com/apache/calcite/commit/a419a12f7d953840a3b557279601f8bf5368b637
Thank you [~jiabao.sun] for the fix!
> ARRAY_AGG should returns ARRAY NULL when there's no input rows
> --------------------------------------------------------------
>
> Key: CALCITE-6008
> URL: https://issues.apache.org/jira/browse/CALCITE-6008
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.35.0
> Reporter: jiabao.sun
> Assignee: jiabao.sun
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.38.0
>
>
> 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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