[
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.
---------------------------------------------
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org
For additional commands, e-mail: issues-all-h...@impala.apache.org
