alamb commented on code in PR #3688:
URL: https://github.com/apache/arrow-datafusion/pull/3688#discussion_r985938095


##########
datafusion/expr/src/binary_rule.rs:
##########
@@ -457,18 +449,18 @@ fn dictionary_coercion(
         (
             DataType::Dictionary(_lhs_index_type, lhs_value_type),
             DataType::Dictionary(_rhs_index_type, rhs_value_type),
-        ) => dictionary_value_coercion(lhs_value_type, rhs_value_type),

Review Comment:
   Arrow now supports general purpose casting, so we can just call back into 
the general comparison coercion code



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