Jesus Camacho Rodriguez created HIVE-22746:
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Summary: Make TypeCheckProcFactory generic
Key: HIVE-22746
URL: https://issues.apache.org/jira/browse/HIVE-22746
Project: Hive
Issue Type: Improvement
Components: CBO
Reporter: Jesus Camacho Rodriguez
Assignee: Jesus Camacho Rodriguez
{{TypeCheckProcFactory}} is responsible for processing AST nodes and generating
ExprNode objects from them. When we generate the expressions for Calcite
planning, we go through a {{AST node -> ExprNode -> RexNode}} transformation.
We would like to avoid the overhead of going through the ExprNode, and thus
generate directly the RexNode from the AST.
To do that, the first step is to make {{TypeCheckProcFactory}} generic, so it
can receive an expression factory and create expressions in different realms.
For the time being, the only factory implementation is the ExprNode factory.
Thus, this patch focuses mainly on refactoring {{TypeCheckProcFactory}} without
breaking anything that is already working.
In a follow-up patch, we will create a {{RexNode}} factory and use it when we
parse the query in CalcitePlanner.
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