| /* |
| * Licensed 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.tajo.algebra; |
| |
| import com.google.gson.annotations.Expose; |
| import com.google.gson.annotations.SerializedName; |
| |
| /** |
| * Describes SQL Standard set function (e.g., sum, min, max, avg, and count) |
| */ |
| public class GeneralSetFunctionExpr extends FunctionExpr { |
| @Expose @SerializedName("IsDistinct") |
| private boolean distinct = false; |
| |
| /** |
| * |
| * @param type Function type which must be one of GeneralSetFunction or CountRowFunction |
| * @param signature Function name |
| * @param distinct True if this function is a distinct aggregation function |
| * @param params An array of function parameters |
| */ |
| protected GeneralSetFunctionExpr(OpType type, String signature, boolean distinct, Expr [] params) { |
| super(type, signature, params); |
| this.distinct = distinct; |
| } |
| |
| /** |
| * |
| * @param signature Function name |
| * @param distinct True if this function is a distinct aggregation function |
| * @param params Function parameters |
| */ |
| public GeneralSetFunctionExpr(String signature, boolean distinct, Expr[] params) { |
| this(OpType.GeneralSetFunction, signature, distinct, params); |
| } |
| |
| /** |
| * |
| * @return True if this function is a distinct aggregation function. Otherwise, it returns False. |
| */ |
| public boolean isDistinct() { |
| return distinct; |
| } |
| |
| @Override |
| public int hashCode() { |
| int hash = super.hashCode(); |
| return hash * 89 * (distinct ? 31 : 23); |
| } |
| |
| @Override |
| public boolean equalsTo(Expr expr) { |
| return distinct == ((GeneralSetFunctionExpr)expr).distinct; |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| GeneralSetFunctionExpr newSetFunc = (GeneralSetFunctionExpr) super.clone(); |
| newSetFunc.distinct = distinct; |
| return newSetFunc; |
| } |
| } |