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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-7959) Split CodeGenerator into CodeGeneratorContext and ExprCodeGenerator
Date Fri, 24 Nov 2017 09:36:01 GMT

    [ https://issues.apache.org/jira/browse/FLINK-7959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16265079#comment-16265079

ASF GitHub Bot commented on FLINK-7959:

Github user twalthr commented on a diff in the pull request:

    --- Diff: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenUtils.scala
    @@ -203,6 +210,569 @@ object CodeGenUtils {
           throw new CodeGenException("Integer expression type expected.")
    +  def generateNullLiteral(
    --- End diff --
    Actually these methods should be part of the `ExprCodeGenerator`. They are more than just
utils but the actual main logic.

> 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
> 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 the subclasses of the {{CodeGenerator}}, but should all as standalone classes.
They can create {{ExprCodeGenerator}} when they 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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