Davies Liu created SPARK-13404:
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Summary: Create the variables for input when it's used
Key: SPARK-13404
URL: https://issues.apache.org/jira/browse/SPARK-13404
Project: Spark
Issue Type: Improvement
Components: SQL
Reporter: Davies Liu
Assignee: Davies Liu
Right now, we create the variables in the first operator (usually
InputAdapter), they could be wasted if most of rows after filtered out
immediately.
We should defer that until they are used by following operators.
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