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Posted to issues@flink.apache.org by "Kurt Young (JIRA)" <ji...@apache.org> on 2019/01/30 10:22:00 UTC
[jira] [Closed] (FLINK-4962) Improve exception information about
operand type inference failure during UDF SQL validation
[ https://issues.apache.org/jira/browse/FLINK-4962?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kurt Young closed FLINK-4962.
-----------------------------
Resolution: Unresolved
> 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
> Components: Table API & SQL
> 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.
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