Qifan Pu created SPARK-16713:
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Summary: Limit codegen method size to 8KB
Key: SPARK-16713
URL: https://issues.apache.org/jira/browse/SPARK-16713
Project: Spark
Issue Type: Improvement
Components: Spark Core, SQL
Affects Versions: 2.0.0
Reporter: Qifan Pu
Ideally, we would wish codegen methods to be less than 8KB for bytecode size.
Beyond 8K JIT won't compile and can cause performance degradation. We have seen
this for queries with wide schema (30+ fields). This is also a major reason for
performance regression when we enable fash aggregate hashmap (such as using
VectorizedHashMapGenerator.scala).
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