jayzhan211 commented on issue #14448:
URL: https://github.com/apache/datafusion/issues/14448#issuecomment-2687958935
I check `simplify_with_cycle_count` with the query `select to_timestamp('1')`
https://github.com/apache/datafusion/blob/fc2fbb3d6b3aded73f1b0902168e008e580c89c1/datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs#L193-L223
I think the Transformed might not be correct, the Expr is unchanged but
`transformed` is true
```
expr: to_timestamp(Utf8("1"))
invoke_with_args timestamp is called
transformed_expr: to_timestamp(Utf8("1"))
transformed: true
expr: to_timestamp(Utf8("1"))
invoke_with_args timestamp is called
transformed_expr: to_timestamp(Utf8("1"))
transformed: true
expr: to_timestamp(Utf8("1"))
invoke_with_args timestamp is called
transformed_expr: to_timestamp(Utf8("1"))
transformed: true
expr: to_timestamp(Utf8("1"))
invoke_with_args timestamp is called
transformed_expr: to_timestamp(Utf8("1"))
transformed: true
expr: to_timestamp(Utf8("1"))
invoke_with_args timestamp is called
transformed_expr: to_timestamp(Utf8("1"))
transformed: true
```
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