jin xing created SPARK-24193:
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Summary: Sort by disk when number of limit is big in
TakeOrderedAndProjectExec
Key: SPARK-24193
URL: https://issues.apache.org/jira/browse/SPARK-24193
Project: Spark
Issue Type: New Feature
Components: SQL
Affects Versions: 2.3.0
Reporter: jin xing
Physical plan of "_select colA from t order by colB limit M_" is
_TakeOrderedAndProject_;
Currently _TakeOrderedAndProject_ sorts data in memory, see
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/limit.scala#L158
Shall we add a config -- if the number of limit (M) is too big, we can sort by
disk ? Thus memory issue can be resolved.
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