[jira] [Created] (FLINK-6884) Incompatible TableSource#getReturnType and actual input type should fail faster

["Dawid Wysakowicz (JIRA)" <ji...@apache.org>]

Dawid Wysakowicz created FLINK-6884:
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             Summary: 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


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.



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