| /* |
| * 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.druid.query.aggregation.datasketches.theta.sql; |
| |
| import org.apache.calcite.sql.SqlAggFunction; |
| import org.apache.calcite.sql.SqlFunctionCategory; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.type.InferTypes; |
| import org.apache.calcite.sql.type.OperandTypes; |
| import org.apache.calcite.sql.type.ReturnTypes; |
| import org.apache.calcite.sql.type.SqlTypeFamily; |
| import org.apache.calcite.sql.type.SqlTypeName; |
| import org.apache.druid.query.aggregation.AggregatorFactory; |
| import org.apache.druid.sql.calcite.aggregation.Aggregation; |
| import org.apache.druid.sql.calcite.aggregation.SqlAggregator; |
| |
| import java.util.Collections; |
| |
| public class ThetaSketchObjectSqlAggregator extends ThetaSketchBaseSqlAggregator implements SqlAggregator |
| { |
| private static final SqlAggFunction FUNCTION_INSTANCE = new ThetaSketchObjectSqlAggFunction(); |
| private static final String NAME = "DS_THETA"; |
| |
| @Override |
| public SqlAggFunction calciteFunction() |
| { |
| return FUNCTION_INSTANCE; |
| } |
| |
| @Override |
| protected Aggregation toAggregation( |
| String name, |
| boolean finalizeAggregations, |
| AggregatorFactory aggregatorFactory |
| ) |
| { |
| return Aggregation.create( |
| Collections.singletonList(aggregatorFactory), |
| null |
| ); |
| } |
| |
| private static class ThetaSketchObjectSqlAggFunction extends SqlAggFunction |
| { |
| private static final String SIGNATURE = "'" + NAME + "(column, size)'\n"; |
| |
| ThetaSketchObjectSqlAggFunction() |
| { |
| super( |
| NAME, |
| null, |
| SqlKind.OTHER_FUNCTION, |
| ReturnTypes.explicit(SqlTypeName.OTHER), |
| InferTypes.VARCHAR_1024, |
| OperandTypes.or( |
| OperandTypes.ANY, |
| OperandTypes.and( |
| OperandTypes.sequence(SIGNATURE, OperandTypes.ANY, OperandTypes.LITERAL), |
| OperandTypes.family(SqlTypeFamily.ANY, SqlTypeFamily.NUMERIC) |
| ) |
| ), |
| SqlFunctionCategory.USER_DEFINED_FUNCTION, |
| false, |
| false |
| ); |
| } |
| } |
| } |