[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 08:41:49 EST 2015
[ https://issues.jboss.org/browse/TEIID-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13031763#comment-13031763 ]
Steven Hawkins commented on TEIID-3276:
---------------------------------------
Part of the issue is determining what value you expect to see for the week function. The resolution to TEIID-3282 was to standardize by default on the iso 8601 week value. If that is appropriate for you, the workaround on an earlier version should be to set the Teiid system property org.teiid.iso8601Week to true and to set the mysql property default_week_format to 3 - http://dev.mysql.com/doc/refman/5.5/en/server-system-variables.html
Then the values should align.
> 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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