liukun4515 commented on PR #3185:
URL:
https://github.com/apache/arrow-datafusion/pull/3185#issuecomment-1217485184
@alamb
I meet a issue the push the issue forward.
In the pr, I need get the `data_type` of the logical expr, but don't find
the method for now codebase.
I am confused about current code, why can't get the data type from the
method of the expr?
I find that the rule `simplify_expressions` which use the
`create_physical_expr` to support to get some information from the expr.
I read some other database system, and find the logical expr should have
their data type, why not we implement like other system? is there any overhead
to implement this?
Can we add the interface or method to get the data_type or result data type
of logical expr easily?
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