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https://issues.apache.org/jira/browse/CALCITE-5884?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17750707#comment-17750707
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Dan Zou commented on CALCITE-5884:
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[~mbudiu] I haven't found any restrictions on this behavior in [BigQuery
Doc|https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#array_to_string].
But I test it in [BigQuery|https://console.cloud.google.com/bigquery], the
result shows that it will return null if the `null_string` is null.
{code:sql}
select array_to_string(array['1','2'], ',', null)
-- returns: null
{code}
> Type Inference rule for ARRAY_TO_STRING is incorrect
> ----------------------------------------------------
>
> Key: CALCITE-5884
> URL: https://issues.apache.org/jira/browse/CALCITE-5884
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.35.0
> Reporter: Mihai Budiu
> Priority: Trivial
> Labels: pull-request-available
>
> This is the current definition of the function ARRAY_TO_STRING in
> SqlLibraryOperators:
> {code:java}
> /** The "ARRAY_TO_STRING(array, delimiter [, nullText ])" function. */
> @LibraryOperator(libraries = {BIG_QUERY})
> public static final SqlFunction ARRAY_TO_STRING =
> SqlBasicFunction.create(SqlKind.ARRAY_TO_STRING,
> ReturnTypes.VARCHAR_NULLABLE,
> OperandTypes.STRING_ARRAY_CHARACTER_OPTIONAL_CHARACTER);
> {code}
> So the result is nullable if any of the arguments is nullable. However, the
> nullability of the last argument does not influence the result nullabillity:
> a NULL value for the third optional argument will not cause a NULL value to
> be output.
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