| /* |
| * 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.store.jdbc.clickhouse; |
| |
| import org.apache.calcite.adapter.jdbc.JdbcTable; |
| import org.apache.calcite.plan.RelOptTable; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.rel.core.TableScan; |
| import org.apache.calcite.sql.parser.SqlParserPos; |
| import org.apache.drill.shaded.guava.com.google.common.base.Preconditions; |
| import org.apache.drill.shaded.guava.com.google.common.collect.ImmutableList; |
| import org.apache.calcite.adapter.java.JavaTypeFactory; |
| import org.apache.calcite.adapter.jdbc.JdbcImplementor; |
| import org.apache.calcite.sql.SqlDialect; |
| import org.apache.calcite.sql.SqlIdentifier; |
| |
| import java.util.Iterator; |
| |
| import static java.util.Objects.requireNonNull; |
| |
| public class ClickhouseJdbcImplementor extends JdbcImplementor { |
| public ClickhouseJdbcImplementor(SqlDialect dialect, |
| JavaTypeFactory typeFactory) { |
| super(dialect, typeFactory); |
| } |
| |
| @Override |
| public Result visit(TableScan scan) { |
| SqlIdentifier sqlIdentifier = getSqlTargetTable(scan); |
| Iterator<String> iter = sqlIdentifier.names.iterator(); |
| Preconditions.checkArgument(sqlIdentifier.names.size() == 3, |
| "size of clickhouse table names:[%s] is not 3", sqlIdentifier.toString()); |
| iter.next(); |
| sqlIdentifier.setNames(ImmutableList.copyOf(iter), null); |
| return result(sqlIdentifier, ImmutableList.of(Clause.FROM), scan, null); |
| } |
| |
| private static SqlIdentifier getSqlTargetTable(RelNode e) { |
| // Use the foreign catalog, schema and table names, if they exist, |
| // rather than the qualified name of the shadow table in Calcite. |
| RelOptTable table = requireNonNull(e.getTable()); |
| return table.maybeUnwrap(JdbcTable.class) |
| .map(JdbcTable::tableName) |
| .orElseGet(() -> |
| new SqlIdentifier(table.getQualifiedName(), SqlParserPos.ZERO)); |
| } |
| } |