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Since removal of typed nulls in #6633, a cast in SPQ of null to any type other than null or a nullable union (i.e., a union containing null) results in an error. Since SQL allows a cast of null to any type, do likewise in SPQ with the result of a cast to a non-null type being a nullable union containing the null value. For example, the result of `null::int64` is `null::(int64|null)`. Note that SUP retains the restriction that null can be cast only to null or a nullable union.
mccanne
approved these changes
Feb 26, 2026
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Since removal of typed nulls in #6633, a cast in SPQ of null to any type other than null or a nullable union (i.e., a union containing null) results in an error. Since SQL allows a cast of null to any type, do likewise in SPQ with the result of a cast to a non-null type being a nullable union containing the null value. For example, the result of
null::int64isnull::(int64|null).Note that SUP retains the restriction that null can be cast only to null or a nullable union.
Fixes #6658.