Hyunsik Choi created TAJO-1092:
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Summary: Improve the function system to allow other function
implementation types
Key: TAJO-1092
URL: https://issues.apache.org/jira/browse/TAJO-1092
Project: Tajo
Issue Type: Improvement
Components: function/udf
Reporter: Hyunsik Choi
Assignee: Hyunsik Choi
Fix For: 0.9.1
In the current function system, each function implementation is a single Java
class subclassed from org.apache.tajo.catalog.function.Function.
In this approach, there are many rooms for improvement. This approach always
uses Datum as input and output values of functions, creating unnecessary
objects. It does not likely to exploit given information included query
statements; for example, some parameters are constants or variables.
In this issue, I propose the improvement to allow the function system to
support other function implementation types. In addition, I propose three
function implementation types:
- legacy Java class function provided by the current Tajo
- static method in Java class
- code generation by ASM
Later, we could expand this feature to allow Pig or Hive functions in Tajo.
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