| /* |
| * 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.sql.calcite.expression.builtin; |
| |
| import org.apache.calcite.rex.RexNode; |
| import org.apache.calcite.sql.SqlFunction; |
| import org.apache.calcite.sql.SqlFunctionCategory; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.type.OperandTypes; |
| import org.apache.calcite.sql.type.SqlTypeFamily; |
| import org.apache.calcite.sql.type.SqlTypeName; |
| import org.apache.druid.segment.column.RowSignature; |
| import org.apache.druid.sql.calcite.expression.DruidExpression; |
| import org.apache.druid.sql.calcite.expression.OperatorConversions; |
| import org.apache.druid.sql.calcite.expression.SqlOperatorConversion; |
| import org.apache.druid.sql.calcite.planner.PlannerContext; |
| |
| public class ArrayToStringOperatorConversion implements SqlOperatorConversion |
| { |
| private static final SqlFunction SQL_FUNCTION = OperatorConversions |
| .operatorBuilder("ARRAY_TO_STRING") |
| .operandTypeChecker( |
| OperandTypes.sequence( |
| "(array,expr)", |
| OperandTypes.or( |
| OperandTypes.family(SqlTypeFamily.STRING), |
| OperandTypes.family(SqlTypeFamily.ARRAY), |
| OperandTypes.family(SqlTypeFamily.MULTISET) |
| ), |
| OperandTypes.family(SqlTypeFamily.ANY) |
| ) |
| ) |
| .functionCategory(SqlFunctionCategory.STRING) |
| .returnTypeNonNull(SqlTypeName.VARCHAR) |
| .build(); |
| |
| @Override |
| public SqlOperator calciteOperator() |
| { |
| return SQL_FUNCTION; |
| } |
| |
| @Override |
| public DruidExpression toDruidExpression( |
| final PlannerContext plannerContext, |
| final RowSignature rowSignature, |
| final RexNode rexNode |
| ) |
| { |
| return OperatorConversions.convertCall( |
| plannerContext, |
| rowSignature, |
| rexNode, |
| druidExpressions -> DruidExpression.of( |
| null, |
| DruidExpression.functionCall("array_to_string", druidExpressions) |
| ) |
| ); |
| } |
| } |