[jira] [Resolved] (IMPALA-4192) Pull all expressions in a fragment into QueryState

["Bikramjeet Vig (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-4192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bikramjeet Vig resolved IMPALA-4192.
------------------------------------
    Fix Version/s: Impala 4.0
       Resolution: Fixed

> Pull all expressions in a fragment into QueryState
> --------------------------------------------------
>
>                 Key: IMPALA-4192
>                 URL: https://issues.apache.org/jira/browse/IMPALA-4192
>             Project: IMPALA
>          Issue Type: Sub-task
>          Components: Backend
>    Affects Versions: Impala 2.8.0
>            Reporter: Michael Ho
>            Assignee: Bikramjeet Vig
>            Priority: Major
>              Labels: codegen
>             Fix For: Impala 4.0
>
>
> Currently, Exprs in a fragment are scattered through the TPlanNode in a fragment. Expr is supposed to be shared by all threads but they are always accessed through thread-private state ExprContext. With multi-threading, an Expr in a fragment and its generated IR function should be shared among all instances of it.
> As part of IMPALA-4080, all Expr in a fragment will be moved to query-wide state instead of having multiple copies of them in the exec nodes of each instances. In addition, moving Expr to query-wide state prevents the mistakes of baking in thread private states (e.g. ExprContext pointers) into the generated IR code for an Expr.



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