1fanwang commented on code in PR #25964:
URL: https://github.com/apache/datafusion/pull/25964#discussion_r4330690214
##########
datafusion/functions/src/core/nvl.rs:
##########
@@ -140,6 +159,23 @@ impl ScalarUDFImpl for NVLFunc {
self.coalesce.short_circuits()
}
+ fn coerce_types(&self, arg_types: &[DataType]) -> Result<Vec<DataType>> {
+ if arg_types.len() != 2 {
+ return exec_err!(
+ "nvl expects exactly two arguments, but received {}",
+ arg_types.len()
+ );
+ }
Review Comment:
Done in
https://github.com/apache/datafusion/commit/c6c46de8aeb39a34d2b61c9a68b3b98b269ac02e.
Uses the shared arity helper.
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