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https://issues.apache.org/jira/browse/FLINK-20725?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17253932#comment-17253932
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Jark Wu commented on FLINK-20725:
---------------------------------
It sounds like relate to FLINK-18890, could you help to have a look at this
[~twalthr]?
> TableFunction#getTypeInference is not work well for
> JdbcRowDataLookupFunction, it's always throws Exception
> -----------------------------------------------------------------------------------------------------------
>
> Key: FLINK-20725
> URL: https://issues.apache.org/jira/browse/FLINK-20725
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.13.0
> Reporter: Lijie Wang
> Priority: Major
>
> I found that TableFunction#getTypeInference is not work well for
> JdbcRowDataLookupFunction , it's always throws Exception.
>
> When I add following test in JdbcRowDataLookupFunctionTest and run it:
> {code:java}
> @Test
> public void testTypeInference() {
> final TableEnvironment env = TableEnvironment.create(EnvironmentSettings
> .newInstance().build());
> final DataTypeFactory dataTypeFactory = ((TableEnvironmentInternal) env)
> .getCatalogManager()
> .getDataTypeFactory();
> JdbcRowDataLookupFunction lookupFunction = buildRowDataLookupFunction();
> lookupFunction.getTypeInference(dataTypeFactory);
> }
> {code}
>
> it always throws following exception:
>
> {code:java}
> Test
> testTypeInference(org.apache.flink.connector.jdbc.table.JdbcRowDataLookupFunctionTest)
> failed with:
> org.apache.flink.table.api.ValidationException: Could not extract a valid
> type inference for function class
> 'org.apache.flink.connector.jdbc.table.JdbcRowDataLookupFunction'. Please
> check for implementation mistakes and/or provide a corresponding hint.
> at
> org.apache.flink.table.types.extraction.ExtractionUtils.extractionError(ExtractionUtils.java:359)
>
> at
> org.apache.flink.table.types.extraction.TypeInferenceExtractor.extractTypeInference(TypeInferenceExtractor.java:160)
>
> at
> org.apache.flink.table.types.extraction.TypeInferenceExtractor.forTableFunction(TypeInferenceExtractor.java:119)
>
> at
> org.apache.flink.table.functions.TableFunction.getTypeInference(TableFunction.java:212)
>
> at
> org.apache.flink.connector.jdbc.table.JdbcRowDataLookupFunctionTest.testTypeInference(JdbcRowDataLookupFunctionTest.java:103)
> Caused by: org.apache.flink.table.api.ValidationException: Error in
> extracting a signature to output mapping.
> at
> org.apache.flink.table.types.extraction.ExtractionUtils.extractionError(ExtractionUtils.java:359)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.extractOutputMapping(FunctionMappingExtractor.java:118)
>
> at
> org.apache.flink.table.types.extraction.TypeInferenceExtractor.extractTypeInferenceOrError(TypeInferenceExtractor.java:170)
>
> at
> org.apache.flink.table.types.extraction.TypeInferenceExtractor.extractTypeInference(TypeInferenceExtractor.java:158)
>
> ... 32 more
> Caused by: org.apache.flink.table.api.ValidationException: Unable to extract
> a type inference from method:
> public void
> org.apache.flink.connector.jdbc.table.JdbcRowDataLookupFunction.eval(java.lang.Object[])
>
> at
> org.apache.flink.table.types.extraction.ExtractionUtils.extractionError(ExtractionUtils.java:359)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.extractResultMappings(FunctionMappingExtractor.java:175)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.extractOutputMapping(FunctionMappingExtractor.java:113)
>
> ... 34 more
> Caused by: org.apache.flink.table.api.ValidationException: Could not extract
> a data type from 'interface org.apache.flink.table.data.RowData' in generic
> class 'org.apache.flink.table.functions.TableFunction' in class
> org.apache.flink.connector.jdbc.table.JdbcRowDataLookupFunction. Please pass
> the required data type manually or allow RAW types.
> at
> org.apache.flink.table.types.extraction.ExtractionUtils.extractionError(ExtractionUtils.java:359)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.extractDataTypeOrRawWithTemplate(DataTypeExtractor.java:273)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.extractDataTypeOrRaw(DataTypeExtractor.java:249)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.extractDataTypeWithClassContext(DataTypeExtractor.java:223)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.extractFromGeneric(DataTypeExtractor.java:144)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.lambda$createGenericResultExtraction$13(FunctionMappingExtractor.java:467)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.putExtractedResultMappings(FunctionMappingExtractor.java:312)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.collectMethodMappings(FunctionMappingExtractor.java:255)
>
> at
> org.apache.flink.table.types.extraction.FunctionMappingExtractor.extractResultMappings(FunctionMappingExtractor.java:167)
>
> ... 35 more
> Caused by: org.apache.flink.table.api.ValidationException: Cannot extract a
> data type from an internal 'org.apache.flink.table.data.RowData' class
> without further information. Please use annotations to define the full
> logical type.
> at
> org.apache.flink.table.types.extraction.ExtractionUtils.extractionError(ExtractionUtils.java:359)
>
> at
> org.apache.flink.table.types.extraction.ExtractionUtils.extractionError(ExtractionUtils.java:351)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.checkForCommonErrors(DataTypeExtractor.java:401)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.extractDataTypeOrError(DataTypeExtractor.java:304)
>
> at
> org.apache.flink.table.types.extraction.DataTypeExtractor.extractDataTypeOrRawWithTemplate(DataTypeExtractor.java:265)
>
> ... 42 more
> {code}
>
> I guess this problem also exists in other LookupFunction implementations. And
> the reason why there was no problem when running
> itcase(JdbcLookupTableITCase) is that the exception was caught and handled in
> LookupJoinCodeGenerator#createLookupTypeInference.
>
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