SQLFlow Predict SQL generate ODPS UDF program

Is your feature request related to a problem? Please describe.

SQLFlow would use ODPS UDF as the Alps prediction Job, for a simple example prediction UDF program:

set mst.model.name=push_common.model;
set mst.oss.id=aaa;
set mst.oss.key=bbb;

.....

SELECT sqlflow_projet.alps_inference(
            concat_ws(",",user_id,label)
            ,1
            ,"deep_id"
            ,COALESCE(deep_id, "")
        ) as (user_info, score)
FROM sqlflow_projet.users;

The SQLFlow Predict SQL can be like:

SELECT sqlflow_projet.alps_inference(
            concat_ws(',',user_id,label)
            ,1
            ,"deep_id"
            ,COALESCE(deep_id, "")
        ) AS (user_info, score)
FROM sqlflow_projet.users
PREDICT sqlflow_project.pred_result
USING sqlflow_model;

There would be two tasks to finish this feature:

[x] SELECT fields syntax need to support ODPS UDF syntax. #600
[x] codegen_alsp can generate the ODPS UDF program and execute through the ODPS database interface. #604
[ ] gomaxcompute need to support adding the query settings. https://github.com/sql-machine-learning/gomaxcompute/issues/45

NOTE: For the future, we need a more general solution to parse the standard SQL syntax.

sql-machine-learning / sqlflow

SQLFlow Predict SQL generate ODPS UDF program #604