[SPARK-21717] Decouple the generated codes of consuming rows in operators under whole-stage codegen - ASF JIRA

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Details

Type: Improvement
Status: Resolved
Priority: Critical
Resolution: Fixed
Affects Version/s: 2.2.0
Fix Version/s: 2.3.0
Component/s: SQL
Labels:
None

Target Version/s:

2.3.0

Description

It has been observed in ~~SPARK-21603~~ that whole-stage codegen suffers performance degradtion, if generated functions are too long to be optimized by JIT.

We basically produce a single function to incorporate generated codes from all physical operators in whole-stage. Thus, it is possibly to grow the size of generated function over a threshold that we can't have JIT optimization for it anymore.

This ticket is trying to decouple the logic of consuming rows in physical operators to avoid a giant function processing rows.