[teiid-issues] [JBoss JIRA] (TEIID-3276) Data result not correct when joinning subquery over a date field
Steven Hawkins (JIRA)
issues at jboss.org
Mon Jan 12 08:22:49 EST 2015
[ https://issues.jboss.org/browse/TEIID-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031752#comment-13031752 ]
Steven Hawkins commented on TEIID-3276:
---------------------------------------
I'm fairly certain that your issues is TEIID-3282. One of the week values is being calculated in mysql while the other is in Teiid. I do not see any general issue with joins.
> Data result not correct when joinning subquery over a date field
> ----------------------------------------------------------------
>
> Key: TEIID-3276
> URL: https://issues.jboss.org/browse/TEIID-3276
> Project: Teiid
> Issue Type: Bug
> Components: JDBC Connector
> Affects Versions: 7.7
> Reporter: Mark Tawk
> Assignee: Steven Hawkins
> Priority: Critical
> Fix For: 8.10
>
>
> Hello,
> I'm using Teiid 8.9.0 To execute the below query and the execution is done without the problem; the issue is that I'm getting different results when executing the same query over mysql
> The original query is much bigger but i tried to simplify it to isolate the problem.
> SELECT DISTINCT
> WEEK(contactcalldetail.startdatetime) AS contactcalldetail_startdatet,
> sessionid_Sub.contactcalldetail_sessionid
> AS contactcalldetail_sessionid
> FROM db_cra_8F_VDB_DSModel.db_cra.contactcalldetail contactcalldetail
> LEFT JOIN /* optional */
> (SELECT COUNT(DISTINCT contactcalldetail_sub.sessionid)
> AS contactcalldetail_sessionid,
> WEEK(contactcalldetail_sub.startdatetime)
> AS contactcalldetail_startdatet
> FROM db_cra_8F_VDB_DSModel.db_cra.contactcalldetail contactcalldetail_sub
> WHERE (((contactcalldetail_sub.contacttype IN (1))))
> AND ((((contactcalldetail_sub.connecttime >= 300))))
> GROUP BY WEEK(contactcalldetail_sub.startdatetime)) sessionid_Sub
> ON (WEEK(contactcalldetail.startdatetime) =
> sessionid_Sub.contactcalldetail_startdatet)
> WHERE (((contactcalldetail.contacttype IN (1))))
> LIMIT 0, 10
> Here is Teiid execution plan :
> <?xml version='1.0' encoding='UTF-8'?><node name="LimitNode"><property name="Output Columns"><value>contactcalldetail_startdatet (integer)</value><value>contactcalldetail_sessionid (integer)</value></property><property name="Statistics"><value>Node Output Rows: 1</value><value>Node Next Batch Process Time: 0</value><value>Node Cumulative Next Batch Process Time: 12</value><value>Node Cumulative Process Time: 0</value><value>Node Next Batch Calls: 3</value><value>Node Blocks: 2</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: 10.0</value></property><property name="Child 0"><node name="SortNode"><property name="Output Columns"><value>contactcalldetail_startdatet (integer)</value><value>contactcalldetail_sessionid (integer)</value></property><property name="Statistics"><value>Node Output Rows: 1</value><value>Node Next Batch Process Time: 0</value><value>Node Cumulative Next Batch Process Time: 12</value><value>Node Cumulative Process Time: 0</value><value>Node Next Batch Calls: 3</value><value>Node Blocks: 2</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Child 0"><node name="ProjectNode"><property name="Output Columns"><value>contactcalldetail_startdatet (integer)</value><value>contactcalldetail_sessionid (integer)</value></property><property name="Statistics"><value>Node Output Rows: 4096</value><value>Node Next Batch Process Time: 0</value><value>Node Cumulative Next Batch Process Time: 13</value><value>Node Cumulative Process Time: 0</value><value>Node Next Batch Calls: 5</value><value>Node Blocks: 3</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Child 0"><node name="JoinNode"><property name="Output Columns"><value>startdatetime (timestamp)</value><value>contactcalldetail_sessionid (integer)</value></property><property name="Statistics"><value>Node Output Rows: 4096</value><value>Node Next Batch Process Time: 0</value><value>Node Cumulative Next Batch Process Time: 11</value><value>Node Cumulative Process Time: 0</value><value>Node Next Batch Calls: 5</value><value>Node Blocks: 3</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Child 0"><node name="AccessNode"><property name="Output Columns"><value>startdatetime (timestamp)</value><value>expr (integer)</value></property><property name="Statistics"><value>Node Output Rows: 4096</value><value>Node Next Batch Process Time: 0</value><value>Node Cumulative Next Batch Process Time: 0</value><value>Node Cumulative Process Time: 0</value><value>Node Next Batch Calls: 7</value><value>Node Blocks: 5</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Query"><value>SELECT DISTINCT g_0.startdatetime AS c_0, WEEK(g_0.startdatetime) AS c_1 FROM db_cra_8F_VDB_DSModel.db_cra.contactcalldetail AS g_0 WHERE g_0.contacttype = 1 ORDER BY c_1</value></property><property name="Model Name"><value>db_cra_8F_VDB_DSModel</value></property></node></property><property name="Child 1"><node name="ProjectNode"><property name="Output Columns"><value>contactcalldetail_startdatet (integer)</value><value>contactcalldetail_sessionid (integer)</value></property><property name="Statistics"><value>Node Output Rows: 3</value><value>Node Next Batch Process Time: 7</value><value>Node Cumulative Next Batch Process Time: 8</value><value>Node Cumulative Process Time: 15</value><value>Node Next Batch Calls: 2</value><value>Node Blocks: 1</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Child 0"><node name="GroupingNode"><property name="Output Columns"><value>gcol0 (integer)</value><value>agg0 (integer)</value></property><property name="Statistics"><value>Node Output Rows: 3</value><value>Node Next Batch Process Time: 14</value><value>Node Cumulative Next Batch Process Time: 8</value><value>Node Cumulative Process Time: 15</value><value>Node Next Batch Calls: 2</value><value>Node Blocks: 1</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Child 0"><node name="AccessNode"><property name="Output Columns"><value>startdatetime (timestamp)</value><value>sessionid (long)</value></property><property name="Statistics"><value>Node Output Rows: 772</value><value>Node Next Batch Process Time: 9</value><value>Node Cumulative Next Batch Process Time: 1</value><value>Node Cumulative Process Time: 9</value><value>Node Next Batch Calls: 2</value><value>Node Blocks: 1</value></property><property name="Cost Estimates"><value>Estimated Node Cardinality: -1.0</value></property><property name="Query"><value>SELECT g_0.startdatetime, g_0.sessionid FROM db_cra_8F_VDB_DSModel.db_cra.contactcalldetail AS g_0 WHERE (g_0.contacttype = 1) AND (g_0.connecttime >= 300)</value></property><property name="Model Name"><value>db_cra_8F_VDB_DSModel</value></property></node></property><property name="Grouping Columns"><value>WEEK(contactcalldetail_sub.startdatetime)</value></property><property name="Sort Mode"><value>false</value></property></node></property><property name="Select Columns"><value>anon_grp0.gcol0 AS contactcalldetail_startdatet</value><value>anon_grp0.agg0 AS contactcalldetail_sessionid</value></property></node></property><property name="Join Strategy"><value>MERGE JOIN (ALREADY_SORTED/SORT)</value></property><property name="Join Type"><value>LEFT OUTER JOIN</value></property><property name="Join Criteria"><value>WEEK(contactcalldetail.startdatetime)=sessionid_Sub.contactcalldetail_startdatet</value></property></node></property><property name="Select Columns"><value>WEEK(contactcalldetail.startdatetime) AS contactcalldetail_startdatet</value><value>sessionid_Sub.contactcalldetail_sessionid AS contactcalldetail_sessionid</value></property></node></property><property name="Sort Mode"><value>DUP_REMOVE</value></property></node></property><property name="Row Offset"><value>null</value></property><property name="Row Limit"><value>10</value></property></node>
> Here are the 2 JDBC queries executed by Teiid:
> SELECT DISTINCT g_0.`startdatetime` AS c_0, week(g_0.`startdatetime`) AS c_1 FROM `db_cra`.`contactcalldetail` AS g_0 WHERE g_0.`contacttype` = 1 ORDER BY c_1
> SELECT g_0.`startdatetime`, g_0.`sessionid` FROM `db_cra`.`contactcalldetail` AS g_0 WHERE g_0.`contacttype` = 1 AND g_0.`connecttime` >= 300
> Teiid query execution result is :
> week countsession
> 36 null
> 37 328
> 38 384
> mysql execution result:
> week countsession
> 35 328
> 36 384
> 37 60
> You can notice that the week is incremented by one and the count result is scrambled
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