jnh5y commented on code in PR #23761: URL: https://github.com/apache/flink/pull/23761#discussion_r1406316719
########## flink-table/flink-table-common/src/main/java/org/apache/flink/table/functions/LegacyUserDefinedFunctionInference.java: ########## @@ -0,0 +1,529 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.table.functions; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.api.common.functions.InvalidTypesException; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.typeutils.TypeExtractor; +import org.apache.flink.table.api.TableException; +import org.apache.flink.table.api.ValidationException; +import org.apache.flink.table.data.DecimalData; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.data.StringData; +import org.apache.flink.table.data.TimestampData; +import org.apache.flink.table.types.DataType; +import org.apache.flink.table.types.inference.ArgumentCount; +import org.apache.flink.table.types.inference.CallContext; +import org.apache.flink.table.types.inference.ConstantArgumentCount; +import org.apache.flink.table.types.inference.InputTypeStrategy; +import org.apache.flink.table.types.inference.Signature; +import org.apache.flink.table.types.inference.TypeStrategy; +import org.apache.flink.table.types.logical.LogicalType; +import org.apache.flink.table.types.logical.LogicalTypeRoot; +import org.apache.flink.table.types.utils.TypeConversions; +import org.apache.flink.types.Row; + +import org.apache.flink.shaded.guava31.com.google.common.primitives.Primitives; + +import java.lang.reflect.Method; +import java.lang.reflect.Modifier; +import java.math.BigDecimal; +import java.sql.Time; +import java.sql.Timestamp; +import java.time.Instant; +import java.time.LocalDateTime; +import java.util.Arrays; +import java.util.Comparator; +import java.util.Date; +import java.util.List; +import java.util.Optional; +import java.util.function.Function; +import java.util.stream.Collectors; +import java.util.stream.IntStream; +import java.util.stream.Stream; + +import static org.apache.flink.table.types.logical.utils.LogicalTypeUtils.toInternalConversionClass; +import static org.apache.flink.table.types.utils.TypeConversions.fromLegacyInfoToDataType; + +/** + * Ported {@code UserDefinedFunctionUtils} to run some of the type inference for legacy functions in + * Table API. + */ +@Internal +@Deprecated +public class LegacyUserDefinedFunctionInference { + + public static InputTypeStrategy getInputTypeStrategy(ImperativeAggregateFunction<?, ?> func) { + return new InputTypeStrategy() { + @Override + public ArgumentCount getArgumentCount() { + return ConstantArgumentCount.any(); + } + + @Override + public Optional<List<DataType>> inferInputTypes( + CallContext callContext, boolean throwOnFailure) { + final List<DataType> argumentDataTypes = callContext.getArgumentDataTypes(); + final DataType accType = getAccumulatorType(func); + final LogicalType[] input = + Stream.concat(Stream.of(accType), argumentDataTypes.stream()) + .map(DataType::getLogicalType) + .toArray(LogicalType[]::new); + + final Optional<Optional<Method>> foundMethod = + Stream.of( + logicalTypesToInternalClasses(input), + logicalTypesToExternalClasses(input)) + .map( + signature -> + getUserDefinedMethod( + func, + "accumulate", + signature, + input, + cls -> + Stream.concat( + Stream.of(accType), + Arrays.stream(cls) + .skip(1) + .map( + c -> + fromLegacyInfoToDataType( + TypeExtractor + .createTypeInfo( + c)))) + .toArray(DataType[]::new))) + .filter(Optional::isPresent) + .findAny(); + + if (foundMethod.isPresent()) { + return Optional.of(argumentDataTypes); + } else { + return callContext.fail(throwOnFailure, ""); + } + } + + @Override + public List<Signature> getExpectedSignatures(FunctionDefinition definition) { + return getSignatures(func, "accumulate"); + } + }; + } + + public static InputTypeStrategy getInputTypeStrategy(TableFunction<?> func) { + return new InputTypeStrategy() { + @Override + public ArgumentCount getArgumentCount() { + return ConstantArgumentCount.any(); + } + + @Override + public Optional<List<DataType>> inferInputTypes( + CallContext callContext, boolean throwOnFailure) { + final List<DataType> argumentDataTypes = callContext.getArgumentDataTypes(); + final LogicalType[] input = + argumentDataTypes.stream() + .map(DataType::getLogicalType) + .toArray(LogicalType[]::new); + + final Optional<Method> foundMethod = + getUserDefinedMethod( + func, + "eval", + argumentDataTypes.stream() + .map(DataType::getConversionClass) + .toArray(Class<?>[]::new), + input, + cls -> + Arrays.stream(cls) + .map( + c -> + fromLegacyInfoToDataType( + TypeExtractor + .createTypeInfo(c))) + .toArray(DataType[]::new)); + + if (foundMethod.isPresent()) { + return Optional.of(argumentDataTypes); + } else { + return callContext.fail( + throwOnFailure, "Given parameters do not match any signature."); + } + } + + @Override + public List<Signature> getExpectedSignatures(FunctionDefinition definition) { + return getSignatures(func, "eval"); + } + }; + } + + public static TypeStrategy getOutputTypeStrategy(ScalarFunction func) { + return callContext -> { + final LogicalType[] params = + callContext.getArgumentDataTypes().stream() + .map(DataType::getLogicalType) + .toArray(LogicalType[]::new); + Optional<Class<?>[]> evalParams = getEvalMethodSignature(func, params); + if (!evalParams.isPresent()) { + return Optional.empty(); + } + + final TypeInformation<?> userDefinedTypeInfo = func.getResultType(evalParams.get()); + if (userDefinedTypeInfo != null) { + return Optional.of(fromLegacyInfoToDataType(userDefinedTypeInfo)); + } else { + final Optional<Method> eval = + getUserDefinedMethod( + func, + "eval", + logicalTypesToExternalClasses(params), + params, + (paraClasses) -> + Arrays.stream(func.getParameterTypes(paraClasses)) + .map(TypeConversions::fromLegacyInfoToDataType) + .toArray(DataType[]::new)); + return eval.flatMap(m -> TypeConversions.fromClassToDataType(m.getReturnType())); + } + }; + } + + public static InputTypeStrategy getInputTypeStrategy(ScalarFunction func) { + return new InputTypeStrategy() { + @Override + public ArgumentCount getArgumentCount() { + return ConstantArgumentCount.any(); + } + + @Override + public Optional<List<DataType>> inferInputTypes( + CallContext callContext, boolean throwOnFailure) { + final List<DataType> argumentDataTypes = callContext.getArgumentDataTypes(); + final LogicalType[] input = + argumentDataTypes.stream() + .map(DataType::getLogicalType) + .toArray(LogicalType[]::new); + + final Optional<Method> foundMethod = + getUserDefinedMethod( + func, + "eval", + logicalTypesToExternalClasses(input), + input, + (paraClasses) -> + Arrays.stream(func.getParameterTypes(paraClasses)) + .map(TypeConversions::fromLegacyInfoToDataType) + .toArray(DataType[]::new)); + + if (foundMethod.isPresent()) { + return Optional.of(argumentDataTypes); + } else { + return callContext.fail( + throwOnFailure, "Given parameters do not match any signature."); + } + } + + @Override + public List<Signature> getExpectedSignatures(FunctionDefinition definition) { + return getSignatures(func, "eval"); + } + }; + } + + private static Optional<Class<?>[]> getEvalMethodSignature( + ScalarFunction func, LogicalType[] expectedTypes) { + return getUserDefinedMethod( + func, + "eval", + logicalTypesToExternalClasses(expectedTypes), + expectedTypes, + (paraClasses) -> + Arrays.stream(func.getParameterTypes(paraClasses)) + .map(TypeConversions::fromLegacyInfoToDataType) + .toArray(DataType[]::new)) + .map( + m -> + getParamClassesConsiderVarArgs( + m.isVarArgs(), + m.getParameterTypes(), + expectedTypes.length)); + } + + private static Class<?>[] getParamClassesConsiderVarArgs( + boolean isVarArgs, Class<?>[] matchingSignature, int expectedLength) { + return IntStream.range(0, expectedLength) + .mapToObj( + i -> { + if (i < matchingSignature.length - 1) { + return matchingSignature[i]; + } else if (isVarArgs) { + return matchingSignature[matchingSignature.length - 1] + .getComponentType(); + } else { + // last argument is not an array type + return matchingSignature[matchingSignature.length - 1]; + } + }) + .toArray(Class<?>[]::new); + } + + private static DataType getAccumulatorType(ImperativeAggregateFunction<?, ?> func) { + final TypeInformation<?> accType = func.getAccumulatorType(); + if (accType != null) { + return fromLegacyInfoToDataType(accType); + } else { + try { + return fromLegacyInfoToDataType( + TypeExtractor.createTypeInfo( + func, ImperativeAggregateFunction.class, func.getClass(), 1)); + } catch (InvalidTypesException ite) { + throw new TableException( + String.format( + "Cannot infer generic type of %s}. You can override" + + " ImperativeAggregateFunction.getAccumulatorType()" + + " to specify the type.", + func.getClass()), + ite); + } + } + } + + private static Class<?>[] logicalTypesToExternalClasses(LogicalType[] types) { + return Arrays.stream(types) + .map( + t -> { + if (t == null) { + return null; + } else { + return TypeConversions.fromLogicalToDataType(t) + .getConversionClass(); + } + }) + .toArray(Class<?>[]::new); + } + + private static Class<?>[] logicalTypesToInternalClasses(LogicalType[] types) { + return Arrays.stream(types) + .map( + t -> { + if (t == null) { + return null; + } else { + return toInternalConversionClass(t); + } + }) + .toArray(Class<?>[]::new); + } + + private static boolean parameterClassEquals(Class<?> candidate, Class<?> expected) { + return candidate == null + || candidate == expected + || expected == Object.class + || candidate == Object.class + || // Special case when we don't know the type + expected.isPrimitive() && Primitives.wrap(expected) == candidate + || candidate == Date.class && (expected == Integer.class || expected == int.class) + || candidate == Time.class && (expected == Integer.class || expected == int.class) + || candidate == StringData.class && expected == String.class + || candidate == String.class && expected == StringData.class + || candidate == TimestampData.class && expected == LocalDateTime.class + || candidate == Timestamp.class && expected == TimestampData.class + || candidate == TimestampData.class && expected == Timestamp.class + || candidate == LocalDateTime.class && expected == TimestampData.class + || candidate == TimestampData.class && expected == Instant.class + || candidate == Instant.class && expected == TimestampData.class + || RowData.class.isAssignableFrom(candidate) && expected == Row.class + || candidate == Row.class && RowData.class.isAssignableFrom(expected) + || RowData.class.isAssignableFrom(candidate) && expected == RowData.class + || candidate == RowData.class && RowData.class.isAssignableFrom(expected) + || candidate == DecimalData.class && expected == BigDecimal.class + || candidate == BigDecimal.class && expected == DecimalData.class + || (candidate.isArray() + && expected.isArray() + && candidate.getComponentType() != null + && expected.getComponentType() == Object.class); + } + + private static boolean parameterDataTypeEquals(LogicalType internal, DataType parameterType) { + if (internal.is(LogicalTypeRoot.RAW) + && parameterType.getLogicalType().is(LogicalTypeRoot.RAW)) { + return TypeConversions.fromLogicalToDataType(internal).getConversionClass() + == parameterType.getConversionClass(); + } else { + // There is a special equal to GenericType. We need rewrite type extract to RowData + // etc... + return parameterType.getLogicalType() == internal + || toInternalConversionClass(internal) + == toInternalConversionClass(parameterType.getLogicalType()); + } + } + + private static Optional<Method> getUserDefinedMethod( + UserDefinedFunction function, + String methodName, + Class<?>[] methodSignature, + LogicalType[] internalTypes, + Function<Class<?>[], DataType[]> parameterTypesFunc) { + final List<Method> methods = checkAndExtractMethods(function, methodName); + + final List<Method> filteredMethods = + methods.stream() + .filter( + cur -> { + final Class<?>[] parameterTypes = cur.getParameterTypes(); + final DataType[] parameterDataTypes = + parameterTypesFunc.apply(parameterTypes); + if (cur.isVarArgs()) { + return varArgsMethodMatch( + methodSignature, + internalTypes, + parameterTypes, + parameterDataTypes); + + } else { + return methodMatch( + methodSignature, + internalTypes, + parameterTypes, + parameterDataTypes); + } + }) + .collect(Collectors.toList()); + + // if there is a fixed method, compiler will call this method preferentially + + final List<Method> found = + filteredMethods.stream() + .sorted(Comparator.comparing(Method::isVarArgs, Boolean::compareTo)) + .filter(cur -> !Modifier.isVolatile(cur.getModifiers())) Review Comment: Seems like no volatile method are ever returned? -- This is an automated message from the Apache Git Service. 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