alamb commented on code in PR #6222:
URL: https://github.com/apache/arrow-datafusion/pull/6222#discussion_r1185113833
##########
datafusion/optimizer/src/analyzer/type_coercion.rs:
##########
@@ -181,6 +181,17 @@ impl TreeNodeRewriter for TypeCoercionRewriter {
is_not_false(get_casted_expr_for_bool_op(&expr,
&self.schema)?);
Ok(expr)
}
+ Expr::IsUnknown(expr) => {
+ // will convert the
binary(expr,IsNotDistinctFrom,lit(Boolean(None));
Review Comment:
I don't understand this comment (and the one below it) -- maybe it belongs
in the test that is updated below that refers to `IS UNKNOWN` ?
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