From the 2 JDBC queries executed by Teiid, i'm convinced that the week is calculated in mysql for the first query, while the second one is getting the date field and then calculating the week at Teiid Level.

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