Hyunsik Choi created TAJO-1436:
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Summary: Add Bind method to EvalNode
Key: TAJO-1436
URL: https://issues.apache.org/jira/browse/TAJO-1436
Project: Tajo
Issue Type: Improvement
Components: operator/expression
Reporter: Hyunsik Choi
Fix For: 0.11.0
EvalNode just has eval() method to evaluate some tuples. It does not have any
method to prepare actual execution.
For example, FieldEval should know an actual field index of an input tuple.
This process is also performed in eval() method.
It has some problems:
* eval() method should involve two works, and it does different behavior with
some flag or null check.
* 'if condition' in eval() method for different behaviors involves
unnecessary branches, causing performance degradation.
So, we should add {{bind(Schema)}} method to EvalNode and then move some
preparation code from eval() to bind(Schame) method.
Also, we should refactor the signature {{eval(Schema, Tuple)}} to
{{eval(Tuple)}}.
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