alan910127 commented on code in PR #14737:
URL: https://github.com/apache/datafusion/pull/14737#discussion_r1969777660
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datafusion/expr/src/type_coercion/functions.rs:
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@@ -435,6 +436,10 @@ fn get_valid_types(
match array_type {
DataType::List(_) | DataType::LargeList(_) =>
Some(array_type.clone()),
DataType::FixedSizeList(field, _) =>
Some(DataType::List(Arc::clone(field))),
+ DataType::Null =>
Some(DataType::List(Arc::new(Field::new_list_field(
+ DataType::Null,
Review Comment:
I was trying something like `array_append(null, [1])`, since only NULL is
possible to be coerced to those types, I use List(Null) here
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