[teiid-issues] [JBoss JIRA] (TEIID-4113) Impala translator - Incorrect aggregate replacement in query
Steven Hawkins (JIRA)
issues at jboss.org
Mon Apr 4 17:17:00 EDT 2016
[ https://issues.jboss.org/browse/TEIID-4113?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186295#comment-13186295 ]
Steven Hawkins commented on TEIID-4113:
---------------------------------------
The query plan debug log from "set showplan debug" can also be useful as that will show what the engine is trying to do.
> Impala translator - Incorrect aggregate replacement in query
> ------------------------------------------------------------
>
> Key: TEIID-4113
> URL: https://issues.jboss.org/browse/TEIID-4113
> Project: Teiid
> Issue Type: Bug
> Components: JDBC Connector
> Affects Versions: 8.13.3
> Environment: Ubuntu Trusty
> Reporter: Don Krapohl
> Assignee: Steven Hawkins
> Labels: Impala_Translator
>
> When PARSETIMESTAMP is included in a query aggregates in other columns may not be written correctly. Example is as below, sum(first_metric) is rewritten to anon_grp0.agg0 in the query sent to Impala.
> Given the schema:
> //source
> SourceTable
> the_attribute string(255),
> first_metric long,
> second_metric bigdecimal
> another_attribute String(255)
> //view
> VirtualTable
> the_attribute string(255),
> first_metric long,
> second_metric bigdecimal
> another_attribute String(255)
> // Teiid query
> SELECT the_attribute,
> cast(
> sum(
> first_metric
> )
> /
> count(
> distinct case when second_metric >= 0 then second_metric end
> ) as double
> ) as some_alias,
> PARSETIMESTAMP(another_attribute, 'yyyy-MM-dd') as somedate
> FROM VirtualTable
> WHERE a_filter_val=111
> GROUP BY the_attribute, another_attribute
> //Query sent to impala
> SELECT g_0.the_attribute AS c_0,
> cast(
> (
> anon_grp0.agg0
> /
> cast(
> anon_grp0.agg1 AS bigint
> )
> ) AS double
> ) AS c_1,
> g_0.another_attribute AS c_2
> FROM VirtualTable
> WHERE a_filter_val=111
> GROUP BY g_0.the_attribute, g_0.another_attribute
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