jayzhan211 commented on issue #14943:
URL: https://github.com/apache/datafusion/issues/14943#issuecomment-2695918517

   ```
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::utils] 
simplify_expressions:
       Projection: t.a
         Filter: CAST(t.b AS Int64) = Int64(4) AND Int64(4) = CAST(t.b AS Int64)
           TableScan: t
       
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::utils] 
unwrap_cast_in_comparison:
       Projection: t.a
         Filter: t.b = Int32(4) AND Int32(4) = t.b
           TableScan: t
       
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'replace_distinct_aggregate' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'eliminate_join' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'decorrelate_predicate_subquery' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'scalar_subquery_to_join' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'extract_equijoin_predicate' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'eliminate_duplicated_expr' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'eliminate_filter' (pass 0)
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::optimizer] Plan unchanged 
by optimizer rule 'eliminate_cross_join' (pass 0)
   [2025-03-04T01:01:44Z DEBUG sqlparser::parser] Parsing sql 
'__common_expr_1'...
   [2025-03-04T01:01:44Z DEBUG sqlparser::parser] Parsing sql 
'__common_expr_1'...
   [2025-03-04T01:01:44Z DEBUG datafusion_optimizer::utils] 
common_sub_expression_eliminate:
       Projection: t.a
         Projection: t.a, t.b
           Filter: __common_expr_1 AND __common_expr_1
             Projection: t.b = Int32(4) AS __common_expr_1, t.a, t.b
               TableScan: t
   ```
   
   We simplify A = B and B = A in `common_sub_expression_eliminate` but not 
`simplify_expressions`


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