Hi， 如果只是想打平array，Flink有个内置的方法，可以参考[1]的”Expanding arrays into a relation“部分
[1] https://ci.apache.org/projects/flink/flink-docs-master/dev/table/sql/queries.html#joins Jark Wu <imj...@gmail.com> 于2020年7月22日周三 上午11:17写道： > Hi, > > Row[] 作为 eval 参数，目前还不支持。社区已经有一个 issue 在跟进支持这个功能： > https://issues.apache.org/jira/browse/FLINK-17855 > > > Best, > Jark > > On Wed, 22 Jul 2020 at 10:45, Dream-底限 <zhan...@akulaku.com> wrote: > > > hi, > > 我想将一个array<row>打散成多行，但是并没有成功 > > > > @FunctionHint(input =@DataTypeHint("ARRAY<ROW<rule_id STRING,rule_name > > STRING,rule_type_name STRING,`result` INT,in_path BOOLEAN>>") ,output > > = @DataTypeHint("ROW<rule_id STRING,rule_name STRING,rule_type_name > > STRING,`result` INT,in_path BOOLEAN>")) > > public static class FlatRowFunction extends TableFunction<Row> { > > private static final long serialVersionUID = 1L; > > > > public void eval(Row[] rows) { > > for (Row row : rows) { > > collect(row); > > } > > } > > } > > > > 异常如下： > > > > org.apache.flink.table.api.ValidationException: SQL validation failed. > > From line 1, column 149 to line 1, column 174: No match found for > > function signature > > flatRow(<RecordType:peek_no_expand(VARCHAR(2147483647) rule_id, > > VARCHAR(2147483647) rule_name, VARCHAR(2147483647) rule_type_name, > > INTEGER result, BOOLEAN in_path) ARRAY>) > > > > at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org > > > $apache$flink$table$planner$calcite$FlinkPlannerImpl$$validate(FlinkPlannerImpl.scala:146) > > at > > > org.apache.flink.table.planner.calcite.FlinkPlannerImpl.validate(FlinkPlannerImpl.scala:108) > > at > > > org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:187) > > at > > > org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:78) > > at > > > org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlQuery(TableEnvironmentImpl.java:658) > > at > > > com.akulaku.data.flink.ParserDataTest.parserDataTest(ParserDataTest.java:60) > > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > > at > > > sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) > > at > > > sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) > > at java.lang.reflect.Method.invoke(Method.java:498) > > 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.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:68) > > at > > > com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33) > > at > > > com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230) > > at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58) > > Caused by: org.apache.calcite.runtime.CalciteContextException: From > > line 1, column 149 to line 1, column 174: No match found for function > > signature flatRow(<RecordType:peek_no_expand(VARCHAR(2147483647) > > rule_id, VARCHAR(2147483647) rule_name, VARCHAR(2147483647) > > rule_type_name, INTEGER result, BOOLEAN in_path) ARRAY>) > > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > > Method) > > at > > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) > > at > > > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) > > at > java.lang.reflect.Constructor.newInstance(Constructor.java:423) > > at > > > org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:457) > > at > > org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:839) > > at > > org.apache.calcite.sql.SqlUtil.newContextException(SqlUtil.java:824) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.newValidationError(SqlValidatorImpl.java:5089) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.handleUnresolvedFunction(SqlValidatorImpl.java:1882) > > at > > org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:305) > > at > > org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:218) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5858) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5845) > > at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.deriveTypeImpl(SqlValidatorImpl.java:1800) > > at > > > org.apache.calcite.sql.validate.ProcedureNamespace.validateImpl(ProcedureNamespace.java:57) > > at > > > org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:1110) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:1084) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:3256) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:3238) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateJoin(SqlValidatorImpl.java:3303) > > at > > > org.apache.flink.table.planner.calcite.FlinkCalciteSqlValidator.validateJoin(FlinkCalciteSqlValidator.java:86) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateFrom(SqlValidatorImpl.java:3247) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateSelect(SqlValidatorImpl.java:3510) > > at > > > org.apache.calcite.sql.validate.SelectNamespace.validateImpl(SelectNamespace.java:60) > > at > > > org.apache.calcite.sql.validate.AbstractNamespace.validate(AbstractNamespace.java:84) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateNamespace(SqlValidatorImpl.java:1110) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateQuery(SqlValidatorImpl.java:1084) > > at org.apache.calcite.sql.SqlSelect.validate(SqlSelect.java:232) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:1059) > > at > > > org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:766) > > at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org > > > $apache$flink$table$planner$calcite$FlinkPlannerImpl$$validate(FlinkPlannerImpl.scala:141) > > ... 28 more > > Caused by: org.apache.calcite.sql.validate.SqlValidatorException: No > > match found for function signature > > flatRow(<RecordType:peek_no_expand(VARCHAR(2147483647) rule_id, > > VARCHAR(2147483647) rule_name, VARCHAR(2147483647) rule_type_name, > > INTEGER result, BOOLEAN in_path) ARRAY>) > > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > > Method) > > at > > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) > > at > > > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) > > at > java.lang.reflect.Constructor.newInstance(Constructor.java:423) > > at > > > org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:457) > > at > > org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:550) > > ... 56 more > > > > > > godfrey he <godfre...@gmail.com> 于2020年7月21日周二 下午7:41写道： > > > > > 可以，定义清楚 getResultType 和 getParameterTypes, 可以参考[1] > > > > > > [1] > > > > > > > > > https://ci.apache.org/projects/flink/flink-docs-release-1.11/dev/table/functions/udfs.html#implementation-guide > > > > > > > > > Dream-底限 <zhan...@akulaku.com> 于2020年7月21日周二 下午7:25写道： > > > > > > > hi > > > > > > > > > > > > > > 我这面在定义一个表函数，通过继承TableFunction完成操作，但是eval方法中的参数类型都是java基本类型（至少看到的demo都是如此），想问一下eval方法中可以传flink > > > > 内部类型吗，比如说我想在eval()方法中传递Row类型要怎么操作，eval(Row row) > > > > > > > > > > -- Best, Benchao Li
