[jira] [Created] (SPARK-13981) Improve Filter generated code to defer variable evaluation within operator

["Nong Li (JIRA)" <ji...@apache.org>]

Nong Li created SPARK-13981:
-------------------------------

             Summary: Improve Filter generated code to defer variable evaluation within operator
                 Key: SPARK-13981
                 URL: https://issues.apache.org/jira/browse/SPARK-13981
             Project: Spark
          Issue Type: Improvement
            Reporter: Nong Li
            Priority: Minor


We can improve the generated filter code by deferring evaluating variables until just before they are needed.

For example. x > 1 and y > b

we can do
{code}
x = ...
if (x <= 1) continue
y = ...
{code}

instead of currently where we do
{code}
x = ...
y = ...
if (x <= 1) continue
...
{code}

This is helpful if evaluating y has any cost.



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