Using UNION ALL with NULL in views results in unintended cast to string and errors ---------------------------------------------------------------------------------- Key: TEIID-4949 URL: https://issues.jboss.org/browse/TEIID-4949 Project: Teiid Issue Type: Bug Components: Query Engine Affects Versions: 9.0.3 Environment: teiid-9.0.3 on WildFly Full 9.0.2.Final (WildFly Core 1.0.2.Final) Reporter: dalex dalex Assignee: Steven Hawkins Priority: Blocker Running the script: {code:sql} select * from views.v2;; {code} leads to the following errors: {code} 2017-06-06 15:27:38,670 ERROR [org.teiid.PROCESSOR] (Worker0_QueryProcessorQueue19) JeWUXFUzqsu3 TEIID30019 Unexpected exception for request JeWUXFUzqsu3.7: org.teiid.core.TeiidRuntimeException: TEIID30447 org.teiid.api.exception.query.QueryResolverException: TEIID30082 Expected value of type 'null' but 'null' is of type 'string' and no implicit conversion is available. at org.teiid.query.sql.lang.SetQuery.getTypedProjectedSymbols(SetQuery.java:145) at org.teiid.query.rewriter.QueryRewriter.correctProjectedTypes(QueryRewriter.java:819) at org.teiid.query.rewriter.QueryRewriter.rewriteSetQuery(QueryRewriter.java:832) at org.teiid.query.rewriter.QueryRewriter.rewriteCommand(QueryRewriter.java:270) at org.teiid.query.rewriter.QueryRewriter.rewrite(QueryRewriter.java:171) at org.teiid.query.rewriter.QueryRewriter.rewrite(QueryRewriter.java:175) at org.teiid.query.optimizer.relational.RelationalPlanner.resolveVirtualGroup(RelationalPlanner.java:1992) at org.teiid.query.optimizer.relational.RelationalPlanner.buildTree(RelationalPlanner.java:1383) at org.teiid.query.optimizer.relational.RelationalPlanner.createQueryPlan(RelationalPlanner.java:1270) at org.teiid.query.optimizer.relational.RelationalPlanner.createQueryPlan(RelationalPlanner.java:1221) at org.teiid.query.optimizer.relational.RelationalPlanner.generatePlan(RelationalPlanner.java:954) at org.teiid.query.optimizer.relational.RelationalPlanner.optimize(RelationalPlanner.java:202) at org.teiid.query.optimizer.QueryOptimizer.optimizePlan(QueryOptimizer.java:159) at org.teiid.dqp.internal.process.Request.generatePlan(Request.java:445) at org.teiid.dqp.internal.process.Request.processRequest(Request.java:473) at org.teiid.dqp.internal.process.RequestWorkItem.processNew(RequestWorkItem.java:642) at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:337) at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51) at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:274) at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:276) at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119) at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:210) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.teiid.api.exception.query.QueryResolverException: TEIID30082 Expected value of type 'null' but 'null' is of type 'string' and no implicit conversion is available. at org.teiid.query.resolver.util.ResolverUtil.convertExpression(ResolverUtil.java:232) at org.teiid.query.resolver.util.ResolverUtil.convertExpression(ResolverUtil.java:197) at org.teiid.query.sql.lang.SetQuery.getTypedProjectedSymbols(SetQuery.java:143) ... 24 more {code}