[FLINK-18520] New Table Function type inference fails

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.11.0
• Fix Version/s: 1.11.1, 1.12.0
• Component/s: Table SQL / API
• Labels: pull-request-available
• Assignee: Timo Walther
• Reporter: Benchao Li
• Created: 07/Jul/20 15:26
• Updated: 11/Aug/20 07:36
• Resolved: 09/Jul/20 08:36

Description

For a simple UDTF like 

public class Split extends TableFunction<String> {
		public Split(){}
		public void eval(String str, String ch) {
			if (str == null || str.isEmpty()) {
				return;
			} else {
				String[] ss = str.split(ch);
				for (String s : ss) {
					collect(s);
				}
			}
		}
	}

register it using new function type inference tableEnv.createFunction("my_split", Split.class); and using it in a simple query will fail with following exception:

Exception in thread "main" org.apache.flink.table.api.ValidationException: SQL validation failed. From line 1, column 93 to line 1, column 115: No match found for function signature my_split(<CHARACTER>, <CHARACTER>)
	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.operations.SqlToOperationConverter.convertSqlInsert(SqlToOperationConverter.java:527)
	at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:204)
	at org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:78)
	at org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlUpdate(TableEnvironmentImpl.java:716)
	at com.bytedance.demo.SqlTest.main(SqlTest.java:64)
Caused by: org.apache.calcite.runtime.CalciteContextException: From line 1, column 93 to line 1, column 115: No match found for function signature my_split(<CHARACTER>, <CHARACTER>)
	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)
	... 7 more
Caused by: org.apache.calcite.sql.validate.SqlValidatorException: No match found for function signature my_split(<CHARACTER>, <CHARACTER>)
	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)
	... 35 more

it's reported from user-zh: http://apache-flink.147419.n8.nabble.com/Flink-1-11-SQL-UDTF-No-match-found-for-function-signature-td4553.html
CC twalthr

Issue Links

• links to: GitHub Pull Request #12857