[jira] [Resolved] (IMPALA-5192) Avoid hard coding pointer to the tuple pool into generated IR of Tuple::CodegenMaterializeExprs()

["Michael Ho (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-5192?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Ho resolved IMPALA-5192.
--------------------------------
       Resolution: Fixed
    Fix Version/s: Impala 2.9.0

https://github.com/apache/incubator-impala/commit/e78d71e63328397ffdb59066982c0c6e83feb3d9

IMPALA-5192: Don't bake MemPool* into IR
Tuple::CodegenMaterializeExprs() currently bakes the MemPool*
provided by its caller into the generated IR. The MemPool*
usually belongs to some exec nodes which owns the codegend
function and it's used for allocating string buffer. With
multi-threading, IR needs to be shared across multiple fragment
instances so IR can no longer contain pointers not shared
across fragment instances.

This change fixes the problem above by using the MemPool*
argument passed to the IR function. This also cleans up
UnionNode by removing the field tuple_pool_ from it and
the logic for transferring buffer from tuple_pool_ to the
MemPool of the row batch.

Change-Id: I09d620e48032351ab9805825a4afb6536bed2302
Reviewed-on: http://gerrit.cloudera.org:8080/6657
Reviewed-by: Michael Ho <kw...@cloudera.com>
Tested-by: Impala Public Jenkins

> Avoid hard coding pointer to the tuple pool into generated IR of Tuple::CodegenMaterializeExprs()
> -------------------------------------------------------------------------------------------------
>
>                 Key: IMPALA-5192
>                 URL: https://issues.apache.org/jira/browse/IMPALA-5192
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Taras Bobrovytsky
>            Assignee: Michael Ho
>              Labels: codegen
>             Fix For: Impala 2.9.0
>
>
> We currently require having a tuple pool that is attached to the exec node because Codegening Tuple::CodegenMaterializeExprs() requires having a pointer to the tuple pool at codegen time. It would be better if it was possible to use the tuple pool of the row batch.
> This affects Union and TopN nodes (and maybe others).



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