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https://issues.apache.org/jira/browse/FLINK-7959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young updated FLINK-7959:
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Description:
Right now {{CodeGenerator}} actually acts two roles, one is responsible for
generating codes from RexNode, and the other one is keeping lots of reusable
statements. It makes more sense to split these logic into two dedicated
classes.
The new {{CodeGeneratorContext}} will keep all the reusable statements, while
the new {{ExprCodeGenerator}} will only do generating codes from RexNode.
And for classes like {{AggregationCodeGenerator}} or {{FunctionCodeGenerator}},
I think the should not be subclass of the {{CodeGenerator}}, but all as
standalone classes. They can create {{ExprCodeGenerator}} when the need to
generating codes from RexNode, and they can also generating codes by
themselves. The {{CodeGeneratorContext}} can be passed around to collect all
reusable statements, and list them in the final generated class.
was:
Right now {{CodeGenerator}} actually acts two roles, one is responsible for
generating codes from RexNode, and the other one is keeping lots of reusable
statements. It makes more sense to split these logic into two dedicated
classes.
The new {{CodeGeneratorContext}} will keep all the reusable statements, while
the new {{ExprCodeGenerator}} will only do generating codes from RexNode.
And classes like {{AggregationCodeGenerator}} or {{FunctionCodeGenerator}}, I
think the should not be subclass of the {{CodeGenerator}}, but all as
standalone classes. They can create {{ExprCodeGenerator}} when the need to
generating codes from RexNode, and they can also generating codes by
themselves. The {{CodeGeneratorContext}} can be passed around to collect all
reusable statements, and list them in the final generated class.
> Split CodeGenerator into CodeGeneratorContext and ExprCodeGenerator
> -------------------------------------------------------------------
>
> Key: FLINK-7959
> URL: https://issues.apache.org/jira/browse/FLINK-7959
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Kurt Young
> Assignee: Kurt Young
> Priority: Major
>
> Right now {{CodeGenerator}} actually acts two roles, one is responsible for
> generating codes from RexNode, and the other one is keeping lots of reusable
> statements. It makes more sense to split these logic into two dedicated
> classes.
> The new {{CodeGeneratorContext}} will keep all the reusable statements, while
> the new {{ExprCodeGenerator}} will only do generating codes from RexNode.
> And for classes like {{AggregationCodeGenerator}} or
> {{FunctionCodeGenerator}}, I think the should not be subclass of the
> {{CodeGenerator}}, but all as standalone classes. They can create
> {{ExprCodeGenerator}} when the need to generating codes from RexNode, and
> they can also generating codes by themselves. The {{CodeGeneratorContext}}
> can be passed around to collect all reusable statements, and list them in the
> final generated class.
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