pick (#42102)
Add a variable `enable_jdbc_cast_predicate_push_down`, the default value
is false, which prohibits the pushdown of non-constant predicates with
type conversion and all predicates with implicit conversion. This change
can prevent the wrong predicates from being pushed down to the Jdbc data
source, resulting in query data errors, because the predicates with cast
were not correctly pushed down to the data source before. If you find
that the data is read correctly and the performance is better before
this change, you can manually set this variable to true
```
| Expression | Can Push Down |
|-----------------------------------------------------|---------------|
| column type equals const type | Yes |
| column type equals cast const type | Yes |
| cast column type equals const type | No |
| cast column type equals cast const type | No |
| column type not equals column type | No |
| column type not equals cast const type | No |
| cast column type not equals const type | No |
| cast column type not equals cast const type | No |
```
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