[FLINK-5792] Improve “UDF/UDTF" to support constructor with parameter.

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0
• Component/s: Table SQL / API
• Assignee: sunjincheng
• Reporter: sunjincheng
• Created: 14/Feb/17 03:19
• Updated: 22/Mar/17 09:42
• Resolved: 22/Mar/17 09:42

Description

Currently UDF/UDTF in the codegen phase using a nonparametric constructor to create the instance, causing the user can not include the state value in the UDF/UDTF. The UDF/UDTF's codegen phase can use a serialized mechanism so that the UDTF can contain state values.
1. UserDefinedFunction inherits Serializable.
2. Modify CodeGenerator about UDF/UDTF part.
3. Modify TableAPI about UDF/UDTF
4. Add Test.