[ https://issues.apache.org/jira/browse/FLINK-4962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jark Wu updated FLINK-4962: --------------------------- Summary: Improve exception information about operand type inference failure during UDF SQL validation (was: Improve exception information about operand type inference failed in UDF SQL validation) > Improve exception information about operand type inference failure during UDF > SQL validation > -------------------------------------------------------------------------------------------- > > Key: FLINK-4962 > URL: https://issues.apache.org/jira/browse/FLINK-4962 > Project: Flink > Issue Type: Improvement > Reporter: Jark Wu > Priority: Minor > > In the SQL validation phase, the custom scalar function 's operand types will > be checked. If there is no corresponding signature , an exception will be > thrown, but the exception message is unclear. > For example: > {code} > object Func13 extends ScalarFunction { > def eval(a: Double): String = { > s"$a" > } > } > tEnv.registerFunction("Func13", Func13) > tEnv.sql("SELECT Func13(1.1) FROM MyTable") > {code} > and it throws > {code} > Disconnected from the target VM, address: '127.0.0.1:63497', transport: > 'socket' > org.apache.flink.api.table.ValidationException: SQL validation failed. > Operand types of could not be inferred. > at > org.apache.flink.api.table.FlinkPlannerImpl.validate(FlinkPlannerImpl.scala:91) > at > org.apache.flink.api.table.expressions.utils.ExpressionTestBase.addSqlTestExpr(ExpressionTestBase.scala:140) > at > org.apache.flink.api.table.expressions.utils.ExpressionTestBase.testSqlApi(ExpressionTestBase.scala:208) > at > org.apache.flink.api.table.expressions.UserDefinedScalarFunctionTest.testResults(UserDefinedScalarFunctionTest.scala:114) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) > at > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > at java.lang.reflect.Method.invoke(Method.java:606) > at > org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) > at > org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) > at > org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) > at > org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) > at > org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) > at > org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) > at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) > at > org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) > at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) > at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) > at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) > at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) > at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) > at org.junit.runners.ParentRunner.run(ParentRunner.java:363) > at org.junit.runner.JUnitCore.run(JUnitCore.java:137) > at > com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117) > at > com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42) > at > com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262) > at > com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84) > Caused by: org.apache.flink.api.table.ValidationException: Operand types of > could not be inferred. > at > org.apache.flink.api.table.functions.utils.ScalarSqlFunction$$anon$2$$anonfun$2.apply(ScalarSqlFunction.scala:108) > at > org.apache.flink.api.table.functions.utils.ScalarSqlFunction$$anon$2$$anonfun$2.apply(ScalarSqlFunction.scala:108) > at scala.Option.getOrElse(Option.scala:120) > at > org.apache.flink.api.table.functions.utils.ScalarSqlFunction$$anon$2.inferOperandTypes(ScalarSqlFunction.scala:108) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.inferUnknownTypes(SqlValidatorImpl.java:1659) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.expandSelectItem(SqlValidatorImpl.java:427) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelectList(SqlValidatorImpl.java:3549) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3052) > at > org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:60) > at > org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:86) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:865) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:846) > at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:208) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:821) > at > org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:532) > at > org.apache.flink.api.table.FlinkPlannerImpl.validate(FlinkPlannerImpl.scala:87) > ... 27 more > {code} > I hope it could express more information about the actual and expected > operand types. > The {{ScalarSqlFunction.createOperandTypeInference}} should be touched. -- This message was sent by Atlassian JIRA (v6.3.4#6332)