Couchbase SUBSTRING function returns null when reaches end of string -------------------------------------------------------------------- Key: TEIID-5034 URL: https://issues.jboss.org/browse/TEIID-5034 Project: Teiid Issue Type: Bug Components: Misc. Connectors Affects Versions: 8.12.x-6.4 Reporter: Jan Stastny Assignee: Steven Hawkins Couchbase return null when y points after the string end in SUBSTRING(VALUE, x, y). That's not what is expected from Teiid. Teiid: {code:sql|title=query1} SELECT SUBSTRING('49',1, 10) {code} || expr1 || || 49 || Couchbase pushdown: {code:sql|title=query2} SELECT SUBSTRING(BQT1.SmallA.intkey, 1, 10) FROM BQT1.SmallA WHERE IntKey=49 {code} || expr1 || || <null> || {code:title=teiid-command.log} 16:18:57,156 INFO [org.teiid.COMMAND_LOG] (New I/O worker #2) QE2ZpDa/Btt5 START USER COMMAND: startTime=2017-08-24 16:18:57.156 requestID=QE2ZpDa/Btt5.124 txID=null sessionID=QE2ZpDa/Btt5 applicationName=JDBC principal=user@teiid-security vdbName=couchbase vdbVersion=1 sql=SELECT SUBSTRING(BQT1.SmallA.intkey, 1, 10) FROM BQT1.SmallA WHERE IntKey=49 16:18:57,160 DEBUG [org.teiid.COMMAND_LOG] (Worker39_QueryProcessorQueue353) QE2ZpDa/Btt5 START DATA SRC COMMAND: startTime=2017-08-24 16:18:57.16 requestID=QE2ZpDa/Btt5.124 sourceCommandID=0 executionID=85 txID=null modelName=Couchbase_small translatorName=couchbase sessionID=QE2ZpDa/Btt5 principal=user@teiid-security sql=SELECT SUBSTRING(convert(Couchbase_small.SmallA.IntKey, string), 1, 10) FROM Couchbase_small.SmallA WHERE Couchbase_small.SmallA.IntKey = 49 16:18:57,160 DEBUG [org.teiid.COMMAND_LOG] (Worker39_QueryProcessorQueue353) QE2ZpDa/Btt5 SOURCE SRC COMMAND: endTime=2017-08-24 16:18:57.16 requestID=QE2ZpDa/Btt5.124 sourceCommandID=0 executionID=85 txID=null modelName=Couchbase_small translatorName=couchbase sessionID=QE2ZpDa/Btt5 principal=user@teiid-security sourceCommand=[SELECT SUBSTR(TOSTRING(`$cb_c1_IntKey`), 1, 10) FROM `dvqe_small` `$cb_t1` LET `$cb_c1_IntKey` = `$cb_t1`.`IntKey` WHERE `$cb_c1_IntKey` = 49 AND `$cb_t1`.`type` = 'SmallA'] 16:18:57,449 DEBUG [org.teiid.COMMAND_LOG] (Worker38_QueryProcessorQueue354) QE2ZpDa/Btt5 END SRC COMMAND: endTime=2017-08-24 16:18:57.449 requestID=QE2ZpDa/Btt5.124 sourceCommandID=0 executionID=85 txID=null modelName=Couchbase_small translatorName=couchbase sessionID=QE2ZpDa/Btt5 principal=user@teiid-security finalRowCount=1 cpuTime(ns)=1213042 16:18:57,456 INFO [org.teiid.COMMAND_LOG] (Worker38_QueryProcessorQueue355) QE2ZpDa/Btt5 END USER COMMAND: endTime=2017-08-24 16:18:57.456 requestID=QE2ZpDa/Btt5.124 txID=null sessionID=QE2ZpDa/Btt5 principal=user@teiid-security vdbName=couchbase vdbVersion=1 finalRowCount=1 {code}