[teiid-issues] [JBoss JIRA] (TEIID-1870) Querying random number from DB2 v97 does not push down to source

Querying random number from DB2 v97 does not push down to source ---------------------------------------------------------------- Key: TEIID-1870 URL: https://issues.jboss.org/browse/TEIID-1870 Project: Teiid Issue Type: Bug Components: Query Engine Affects Versions: 7.6 Reporter: Paul Nittel Assignee: Steven Hawkins Fix For: 7.7, 8.0 Attachments: QT_db2v97ds_Push.vdb When I query SELECT RAND(), IntKey from SmallA using DB2 directly, I get back: 1,INTKEY 0.00125,0 0.56359,1 0.1933,2 0.80874,3 Using the equivalent SQL through Teiid to DB2, I get: expr,IntKey 0.86867,0 0.86867,1 0.86867,2 0.86867,3 The command log entry for the Teiid query looks like this: 2011-12-14 07:50:22,093 DEBUG [org.teiid.COMMAND_LOG] (New I/O server worker #1-2 START USER COMMAND: startTime=2011-12-14 07:50:22.093 requestID=KURKVzpMf/MI.12 txID=null sessionID=KURKVzpMf/MI applicationName=JDBC principal=user@teiid-security vdbName=QT_db2v97ds_Push vdbVersion=1 sql=select rand(), curtime(), intkey from bqt1.smalla limit 5 2011-12-14 07:50:22,099 DEBUG [org.teiid.COMMAND_LOG] (Worker6_QueryProcessorQueue1394 START DATA SRC COMMAND: startTime=2011-12-14 07:50:22.098 requestID=KURKVzpMf/MI.12 sourceCommandID=0 txID=null modelName=Source connectorBindingName=db2 sessionID=KURKVzpMf/MI principal=user@teiid-security sql=SELECT convert(g_0.INTKEY, integer) AS c_2 FROM Source.SMALLA AS g_0 LIMIT 5 2011-12-14 07:50:22,394 DEBUG [org.teiid.COMMAND_LOG] (Worker6_QueryProcessorQueue1396 END SRC COMMAND: endTime=2011-12-14 07:50:22.394 requestID=KURKVzpMf/MI.12 sourceCommandID=0 txID=null modelName=Source connectorBindingName=db2 sessionID=KURKVzpMf/MI principal=user@teiid-security finalRowCount=5 2011-12-14 07:50:22,427 DEBUG [org.teiid.COMMAND_LOG] (Worker5_QueryProcessorQueue1397 END USER COMMAND: endTime=2011-12-14 07:50:22.427 requestID=KURKVzpMf/MI.12 txID=null sessionID=KURKVzpMf/MI principal=user@teiid-security vdbName=QT_db2v97ds_Push vdbVersion=1 finalRowCount=0 The source command appears to be lacking the rand() function call. In response, dev says, "So the issue here is that the final rewrite of the pushdown query is pre-evaluating the non-deterministic pushdown function. If the function were not pushed-down you would get something more like you would expect."