NPE in MergeJoinStrategy when using joins with a particular limit value

1. In postgresql create the test_a and test_e tables using the following scripts: CREATE TABLE public .test_a ( a integer , b integer ); INSERT INTO public .test_a( a , b) VALUES (1, 1); INSERT INTO public .test_a( a , b) VALUES (1, 2); INSERT INTO public .test_a( a , b) VALUES (2, 1); INSERT INTO public .test_a( a , b) VALUES (2, 2); INSERT INTO public .test_a( a , b) VALUES (3, 2); INSERT INTO public .test_a( a , b) VALUES (3, 10); CREATE TABLE public .test_e ( e character varying (254), f integer ); INSERT INTO public .test_e(e, f) VALUES ( 'test' , 1234); INSERT INTO public .test_e(e, f) VALUES ( 'abcde' , 1111); INSERT INTO public .test_e(e, f) VALUES ( 'abtest' , 2222); INSERT INTO public .test_e(e, f) VALUES ( 'testab' , 3333); INSERT INTO public .test_e(e, f) VALUES ( 'abtestab' , 4444); 2. Add postgresql database configuration in standalone-teiid.xml: <datasource jndi-name= "java:/test_tables_pg" pool-name= "test_tables_pg" enabled= "true" use-java-context= "true" > <connection-url> jdbc:postgresql://localhost:5432/test?charSet=utf8 </connection-url> <driver-class> org.postgresql.Driver </driver-class> <driver> org.postgresql </driver> <pool> <min-pool-size> 2 </min-pool-size> <max-pool-size> 70 </max-pool-size> <prefill> false </prefill> <use-strict-min> false </use-strict-min> <flush-strategy> FailingConnectionOnly </flush-strategy> </pool> <security> <user-name> XXXXX </user-name> <password> XXXXX </password> </security> <validation> <check-valid-connection-sql> select 0 </check-valid-connection-sql> </validation> <timeout> <blocking-timeout-millis> 120000 </blocking-timeout-millis> <idle-timeout-minutes> 5 </idle-timeout-minutes> </timeout> </datasource> 3. Add in test-vdb.xml java:/test_tables_pg configured in previous step as datasource: <model name= "test_tables_pg" > <property name= "importer.useFullSchemaName" value= "false" /> <property name= "importer.tableTypes" value= "TABLE,VIEW" /> <property name= "importer.importKeys" value= "false" /> <source name= "test_tables_pg" translator-name= "myPg" connection-jndi-name= "java:/test_tables_pg" /> </model> 4. Configure in the test-vdb.xml the following virtual view: <model visible = "true" type = "VIRTUAL" name = "views" > <metadata type = "DDL" > <![CDATA[ create view v as select * from( select e from "test_tables_pg.test_e" tb1, TEXTTABLE(tb1.e COLUMNS col1 string) x ) t join "test_tables_pg.test_a" tb2 on true ]]> </metadata> </model> 5. Run the following query: begin declare integer i=0; while (i < 2) begin select * from "test_tables_pg.test_a" t0 JOIN "test_tables_pg.test_e" t1 ON true JOIN "test_tables_pg.test_e" t2 ON true JOIN views.v t3 on true JOIN views.v t4 on true limit 257 ; i=i+1; end end ;; IMPORTANT: you shouldn't use row limit. I used SQuirrel and the bug was reproduced only when I removed row limit and provided limit clause with 257 value and above. If you provide limit clause with 256 value and below the query above will work correctly.