add a defer in fold constant to close.
add more type when call _get_result function in fold constant.3.
fix in can't handle null. eg:select 1 in (2, NULL, 1);
in java udf jni_ctx will be nullptr, so call close will be core dump.
Describe your changes.
This feature is propsoed in [DSIP-1](https://cwiki.apache.org/confluence/display/DORIS/DSIP-001%3A+Java+UDF).
This PR support fixed-length input and output Java UDF. Phase I in DIP-1 is done after this PR.
To support Java UDF effeciently, I use no data copy in JNI call and all compute operations are off-heap in Java.
To achieve that, I use a UdfExecutor instead.
For users, a UDF class must have a public evaluate method.
