Krisztian Kasa created HIVE-26747:
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Summary: Remove implementor from HiveRelNode
Key: HIVE-26747
URL: https://issues.apache.org/jira/browse/HIVE-26747
Project: Hive
Issue Type: Task
Components: CBO
Reporter: Krisztian Kasa
Assignee: Krisztian Kasa
Calcite's VolcanoPlanner [1] relies on calling convention [2]. In Hive this is
represented by the
[HiveRelNode|https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/reloperators/HiveRelNode.java]
interface's {{CONVENTION}} field.
This interface has to be implemented by all Hive operators to have the Hive
calling convention behavior. The interface also defines the
{code:java}
void implement(Implementor implementor);
{code}
method but none of the operators gives an implementation and the method is
never called.
[1]
[https://15721.courses.cs.cmu.edu/spring2017/papers/14-optimizer1/graefe-icde1993.pdf]
[2] [https://arxiv.org/pdf/1802.10233.pdf] (Section 4, traits)
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