| /* |
| * 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.drill.exec.planner.sql.parser; |
| |
| import org.apache.calcite.sql.SqlCall; |
| import org.apache.calcite.sql.SqlIdentifier; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.SqlLiteral; |
| import org.apache.calcite.sql.SqlNode; |
| import org.apache.calcite.sql.SqlOperator; |
| import org.apache.calcite.sql.SqlSetOption; |
| import org.apache.calcite.sql.SqlSpecialOperator; |
| import org.apache.calcite.sql.SqlWriter; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.drill.exec.planner.sql.handlers.SetOptionHandler; |
| |
| /** |
| * Sql parse tree node to represent statement: {@code SET <NAME> [ = VALUE ]}. |
| * Statement handled in: {@link SetOptionHandler} |
| */ |
| public final class DrillSqlSetOption extends SqlSetOption { |
| |
| public static final SqlSpecialOperator OPERATOR = new SqlSpecialOperator("SET_OPTION", SqlKind.SET_OPTION) { |
| @Override |
| public SqlCall createCall(SqlLiteral functionQualifier, SqlParserPos pos, SqlNode... operands) { |
| SqlNode scopeNode = operands[0]; |
| String scope = scopeNode == null ? null : scopeNode.toString(); |
| return new DrillSqlSetOption(pos, scope, (SqlIdentifier) operands[1], operands[2]); |
| } |
| }; |
| |
| public DrillSqlSetOption(SqlParserPos pos, String scope, SqlIdentifier name, SqlNode value) { |
| super(pos, scope, name, value); |
| } |
| |
| @Override |
| public SqlKind getKind() { |
| return SqlKind.SET_OPTION; |
| } |
| |
| @Override |
| public SqlOperator getOperator() { |
| return OPERATOR; |
| } |
| |
| @Override |
| protected void unparseAlterOperation(SqlWriter writer, int leftPrec, int rightPrec) { |
| writer.keyword("SET"); |
| |
| SqlWriter.Frame frame = writer.startList(SqlWriter.FrameTypeEnum.SIMPLE); |
| this.getName().unparse(writer, leftPrec, rightPrec); |
| |
| if (this.getValue() != null) { |
| writer.sep("="); |
| this.getValue().unparse(writer, leftPrec, rightPrec); |
| } |
| |
| writer.endList(frame); |
| } |
| } |