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sunjincheng commented on FLINK-6884: ------------------------------------ The {{generateResultExpression}} is called by {{generateConverterResultExpression}} method which calculate the list of expressions,So I think we can only improve the error message. What do you think? > Incompatible TableSource#getReturnType and actual input type should fail > faster > ------------------------------------------------------------------------------- > > Key: FLINK-6884 > URL: https://issues.apache.org/jira/browse/FLINK-6884 > Project: Flink > Issue Type: Bug > Components: Table API & SQL > Affects Versions: 1.3.0 > Reporter: Dawid Wysakowicz > Assignee: sunjincheng > > When a {{TableSource#getReturnType}} differs from the actual input type the > exception is thrown in code generation step with an exception that is hard to > track back: > {code} > org.apache.flink.table.codegen.CodeGenException: Arity of result type does > not match number of expressions. > at > org.apache.flink.table.codegen.CodeGenerator.generateResultExpression(CodeGenerator.scala:940) > at > org.apache.flink.table.codegen.CodeGenerator.generateConverterResultExpression(CodeGenerator.scala:883) > at > org.apache.flink.table.plan.nodes.CommonScan$class.generatedConversionFunction(CommonScan.scala:57) > at > org.apache.flink.table.plan.nodes.datastream.StreamTableSourceScan.generatedConversionFunction(StreamTableSourceScan.scala:35) > at > org.apache.flink.table.plan.nodes.datastream.StreamScan$class.convertToInternalRow(StreamScan.scala:48) > at > org.apache.flink.table.plan.nodes.datastream.StreamTableSourceScan.convertToInternalRow(StreamTableSourceScan.scala:35) > at > org.apache.flink.table.plan.nodes.datastream.StreamTableSourceScan.translateToPlan(StreamTableSourceScan.scala:107) > {code} > It would be nice if more meaningful exception was thrown earlier. -- This message was sent by Atlassian JIRA (v6.3.15#6346)