Weijun-H commented on code in PR #8902:
URL: https://github.com/apache/arrow-datafusion/pull/8902#discussion_r1468749394
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datafusion/expr/src/type_coercion/functions.rs:
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@@ -311,6 +329,8 @@ fn coerced_from<'a>(
Utf8 | LargeUtf8 => Some(type_into.clone()),
Null if can_cast_types(type_from, type_into) =>
Some(type_into.clone()),
+ List(_) if matches!(type_from, FixedSizeList(_, _)) =>
Some(type_into.clone()),
Review Comment:
Yes, we do.
In
`ExprSchemale`(https://github.com/apache/arrow-datafusion/blob/a7cdf605a1e23608e51889988c239613c80fb671/datafusion/expr/src/expr_schema.rs#L91-L105)
It forces the function return type consistent, but I am not sure of its
purpose. Maybe @2010YOUY01 could explain it more.
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