liukun4515 commented on code in PR #3254:
URL: https://github.com/apache/arrow-datafusion/pull/3254#discussion_r964670550
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datafusion/optimizer/src/type_coercion.rs:
##########
@@ -116,18 +117,61 @@ impl ExprRewriter for TypeCoercionRewriter {
}
}
}
+ Expr::ScalarUDF { fun, args } => {
+ let new_expr = coerce_arguments_for_signature(
+ args.as_slice(),
+ &self.schema,
+ &fun.signature,
+ )?;
+ Ok(Expr::ScalarUDF {
+ fun: fun.clone(),
+ args: new_expr,
+ })
+ }
_ => Ok(expr),
}
}
}
+/// Returns `expressions` coerced to types compatible with
+/// `signature`, if possible.
+///
+/// See the module level documentation for more detail on coercion.
+pub fn coerce_arguments_for_signature(
Review Comment:
Do we need to public this method?
I think it's better to make it private.
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