liukun4515 commented on a change in pull request #1969:
URL: https://github.com/apache/arrow-datafusion/pull/1969#discussion_r833836718
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File path: datafusion/src/physical_plan/functions.rs
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@@ -111,6 +112,11 @@ pub fn return_type(
utf8_to_int_type(&input_expr_types[0], "character_length")
}
BuiltinScalarFunction::Chr => Ok(DataType::Utf8),
+ BuiltinScalarFunction::Coalesce => {
+ // COALESCE has multiple args and they might get coerced, get a
preview of this
+ let coerced_types = data_types(input_expr_types, &signature(fun));
Review comment:
Is there any doc or reference to guide for the common result type or the
coercion type?
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