[BEAM-10925] Create ZetaSQL-specific subclass of ScalarFunctionImpl t… #13309
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| @@ -0,0 +1,86 @@ | ||
| /* | ||
| * 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.beam.sdk.extensions.sql.zetasql.translation; | ||
|
|
||
| import java.lang.reflect.Method; | ||
| import org.apache.beam.sdk.extensions.sql.impl.ScalarFunctionImpl; | ||
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.adapter.enumerable.CallImplementor; | ||
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.schema.Function; | ||
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.schema.ScalarFunction; | ||
|
|
||
| /** ZetaSQL-specific extension to {@link ScalarFunctionImpl}. */ | ||
| public class ZetaSqlScalarFunctionImpl extends ScalarFunctionImpl { | ||
| /** | ||
| * ZetaSQL function group identifier. Different function groups may have divergent translation | ||
| * paths. | ||
| */ | ||
| public final String functionGroup; | ||
|
|
||
| private ZetaSqlScalarFunctionImpl( | ||
| Method method, CallImplementor implementor, String functionGroup) { | ||
| super(method, implementor); | ||
| this.functionGroup = functionGroup; | ||
| } | ||
|
|
||
| /** | ||
| * Creates {@link org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.schema.Function} from | ||
| * given class. | ||
| * | ||
| * <p>If a method of the given name is not found or it does not suit, returns {@code null}. | ||
| * | ||
| * @param clazz class that is used to implement the function | ||
| * @param methodName Method name (typically "eval") | ||
| * @param functionGroup ZetaSQL function group identifier. Different function groups may have | ||
| * divergent translation paths. | ||
| * @return created {@link ScalarFunction} or null | ||
| */ | ||
| public static Function create(Class<?> clazz, String methodName, String functionGroup) { | ||
| return create(findMethod(clazz, methodName)); | ||
| } | ||
|
|
||
| /** | ||
| * Creates {@link org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.schema.Function} from | ||
| * given method. When {@code eval} method does not suit, {@code null} is returned. | ||
| * | ||
| * @param method method that is used to implement the function | ||
| * @param functionGroup ZetaSQL function group identifier. Different function groups may have | ||
| * divergent translation paths. | ||
| * @return created {@link Function} or null | ||
| */ | ||
| public static Function create(Method method, String functionGroup) { | ||
| validateMethod(method); | ||
| CallImplementor implementor = createImplementor(method); | ||
| return new ZetaSqlScalarFunctionImpl(method, implementor, functionGroup); | ||
| } | ||
|
|
||
| /* | ||
| * Finds a method in a given class by name. | ||
| * @param clazz class to search method in | ||
| * @param name name of the method to find | ||
| * @return the first method with matching name or null when no method found | ||
| */ | ||
| private static Method findMethod(Class<?> clazz, String name) { | ||
| for (Method method : clazz.getMethods()) { | ||
| if (method.getName().equals(name) && !method.isBridge()) { | ||
| return method; | ||
| } | ||
| } | ||
| throw new NoSuchMethodError( | ||
| String.format("Method %s not found in class %s.", name, clazz.getName())); | ||
| } | ||
| } |
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for these
ZETASQL_FUNCTION_GROUP_NAME, eventually I think we will migrate it off fromcreateUdfOperator.