Terry Wang created FLINK-16414:
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Summary: create udaf/udtf function using sql casuing ValidationException: SQL validation failed. null
Key: FLINK-16414
URL:
https://issues.apache.org/jira/browse/FLINK-16414 Project: Flink
Issue Type: Bug
Components: Table SQL / API
Affects Versions: 1.10.0
Reporter: Terry Wang
When using TableEnvironment.sqlupdate() to create a udaf or udtf function, if the function doesn't override the getResultType() method, it's normal. But when using this function in the insert sql, some exception like following will be throwed:
Exception in thread "main" org.apache.flink.table.api.ValidationException: SQL validation failed. null
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.org$apache$flink$table$planner$calcite$FlinkPlannerImpl$$validate(FlinkPlannerImpl.scala:130)
at org.apache.flink.table.planner.calcite.FlinkPlannerImpl.validate(FlinkPlannerImpl.scala:105)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:127)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convertSqlInsert(SqlToOperationConverter.java:342)
at org.apache.flink.table.planner.operations.SqlToOperationConverter.convert(SqlToOperationConverter.java:142)
at org.apache.flink.table.planner.delegation.ParserImpl.parse(ParserImpl.java:66)
at org.apache.flink.table.api.internal.TableEnvironmentImpl.sqlUpdate(TableEnvironmentImpl.java:484)
The reason is in FunctionDefinitionUtil#createFunctionDefinition, we shouldn't direct call t.getResultType or a.getAccumulatorType() or a.getResultType() but using UserDefinedFunctionHelper#getReturnTypeOfTableFunction
UserDefinedFunctionHelper#getAccumulatorTypeOfAggregateFunction
UserDefinedFunctionHelper#getReturnTypeOfAggregateFunction instead.
```
if (udf instanceof ScalarFunction) {
return new ScalarFunctionDefinition(
name,
(ScalarFunction) udf
);
} else if (udf instanceof TableFunction) {
TableFunction t = (TableFunction) udf;
return new TableFunctionDefinition(
name,
t,
t.getResultType()
);
} else if (udf instanceof AggregateFunction) {
AggregateFunction a = (AggregateFunction) udf;
return new AggregateFunctionDefinition(
name,
a,
a.getAccumulatorType(),
a.getResultType()
);
} else if (udf instanceof TableAggregateFunction) {
TableAggregateFunction a = (TableAggregateFunction) udf;
return new TableAggregateFunctionDefinition(
name,
a,
a.getAccumulatorType(),
a.getResultType()
);
```
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