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after this #3582 merged, the type coercion will be done before the optimizer.
The PreCastLitInComparisonExpressions will take affect.
For example:
schema: the data type of c is int32
select * from table c > 10;
after done the type coercion, we will get the expr like cast(c as int64) > int64(10) and the PreCastLitInComparisonExpressions will not affect the above expr.
But we can convert the int64(10) to the type of c with unwrap cast the expr cast(c as int64), it is very similar to what spark done https://issues.apache.org/jira/browse/SPARK-32858
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