| /* |
| * 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.iotdb.db.queryengine.plan.expression.multi.builtin.helper; |
| |
| import org.apache.iotdb.db.exception.sql.SemanticException; |
| import org.apache.iotdb.db.queryengine.plan.expression.multi.FunctionExpression; |
| import org.apache.iotdb.db.queryengine.plan.expression.multi.builtin.BuiltInScalarFunctionHelper; |
| import org.apache.iotdb.db.queryengine.transformation.api.LayerPointReader; |
| import org.apache.iotdb.db.queryengine.transformation.dag.column.ColumnTransformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.column.unary.scalar.DiffFunctionColumnTransformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.transformer.Transformer; |
| import org.apache.iotdb.db.queryengine.transformation.dag.transformer.unary.scalar.DiffFunctionTransformer; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| import org.apache.iotdb.tsfile.read.common.type.TypeFactory; |
| |
| public class DiffFunctionHelper implements BuiltInScalarFunctionHelper { |
| |
| @Override |
| public void checkBuiltInScalarFunctionInputDataType(TSDataType tsDataType) |
| throws SemanticException { |
| if (tsDataType.isNumeric()) { |
| return; |
| } |
| throw new SemanticException( |
| "Input series of Scalar function [DIFF] only supports numeric data types [INT32, INT64, FLOAT, DOUBLE]"); |
| } |
| |
| @Override |
| public TSDataType getBuiltInScalarFunctionReturnType(FunctionExpression functionExpression) { |
| return TSDataType.DOUBLE; |
| } |
| |
| @Override |
| public ColumnTransformer getBuiltInScalarFunctionColumnTransformer( |
| FunctionExpression expression, ColumnTransformer columnTransformer) { |
| return new DiffFunctionColumnTransformer( |
| TypeFactory.getType(TSDataType.DOUBLE), |
| columnTransformer, |
| Boolean.parseBoolean( |
| expression.getFunctionAttributes().getOrDefault("ignoreNull", "true"))); |
| } |
| |
| @Override |
| public Transformer getBuiltInScalarFunctionTransformer( |
| FunctionExpression expression, LayerPointReader layerPointReader) { |
| return new DiffFunctionTransformer( |
| layerPointReader, |
| Boolean.parseBoolean( |
| expression.getFunctionAttributes().getOrDefault("ignoreNull", "true"))); |
| } |
| } |