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Posted to issues-all@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2019/04/05 00:55:00 UTC
[jira] [Work started] (IMPALA-4356) Automatically codegen
expressions with any root Expr node
[ https://issues.apache.org/jira/browse/IMPALA-4356?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on IMPALA-4356 started by Tim Armstrong.
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> Automatically codegen expressions with any root Expr node
> ---------------------------------------------------------
>
> Key: IMPALA-4356
> URL: https://issues.apache.org/jira/browse/IMPALA-4356
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.8.0
> Reporter: Tim Armstrong
> Assignee: Tim Armstrong
> Priority: Major
> Labels: codegen
>
> Currently Impala only automatically codegens expression subtrees with ScalarFnCall at the root. This is the expression type used to implement many but not all expressions (including most builtin operators). One example of an expression that is not automatically codegened is "case" statements.
> The crux of this is to move ScalarFnCall::scalar_fn_wrapper_ into ScalarExpr (and probably rename it). There are some consequential changes required to make this work. Instead of each ScalarExpr subclass overriding Get*Val(), I think Get*Val() should be a non-virtual method of ScalarExpr that either calls the codegen'd function or calls into Get*ValInterpreted(), which would be the new virtual function.
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