eg: udf('asd'), this need return a const column, otherwise will be failed use the return column as other function params.
mysql> select concat('a', 'b', cuuid9('a'), ':c');
ERROR 1105 (HY000): errCode = 2, detailMessage = (10.16.10.6)[CANCELLED][INTERNAL_ERROR]const check failed, expr=VectorizedFn[VectorizedFnCallconcat]{
VLiteral (name = String, type = String, value = (a)),
VLiteral (name = String, type = String, value = (b)),
VectorizedFn[VectorizedFnCallcuuid9]
{ VLiteral (name = String, type = String, value = (a))},
VLiteral (name = String, type = String, value = (:c))}
Currently, there are some useless includes in the codebase. We can use a tool named include-what-you-use to optimize these includes. By using a strict include-what-you-use policy, we can get lots of benefits from it.
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.
