| /* |
| * 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 maynot 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 applicablelaw 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.phoenix.pig.util; |
| |
| import java.sql.Connection; |
| import java.sql.SQLException; |
| import java.sql.Statement; |
| import java.util.List; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.phoenix.compile.ColumnProjector; |
| import org.apache.phoenix.compile.QueryPlan; |
| import org.apache.phoenix.jdbc.PhoenixStatement; |
| import org.apache.phoenix.mapreduce.util.ConnectionUtil; |
| import org.apache.phoenix.util.ColumnInfo; |
| |
| import org.apache.phoenix.thirdparty.com.google.common.base.Function; |
| import org.apache.phoenix.thirdparty.com.google.common.base.Preconditions; |
| import org.apache.phoenix.thirdparty.com.google.common.collect.Lists; |
| |
| public final class SqlQueryToColumnInfoFunction implements Function<String,List<ColumnInfo>> { |
| |
| private static final Log LOG = LogFactory.getLog(SqlQueryToColumnInfoFunction.class); |
| private final Configuration configuration; |
| |
| public SqlQueryToColumnInfoFunction(final Configuration configuration) { |
| this.configuration = configuration; |
| } |
| |
| @Override |
| public List<ColumnInfo> apply(String sqlQuery) { |
| Preconditions.checkNotNull(sqlQuery); |
| Connection connection = null; |
| List<ColumnInfo> columnInfos = null; |
| try { |
| connection = ConnectionUtil.getInputConnection(this.configuration); |
| final Statement statement = connection.createStatement(); |
| final PhoenixStatement pstmt = statement.unwrap(PhoenixStatement.class); |
| final QueryPlan queryPlan = pstmt.compileQuery(sqlQuery); |
| final List<? extends ColumnProjector> projectedColumns = queryPlan.getProjector().getColumnProjectors(); |
| columnInfos = Lists.newArrayListWithCapacity(projectedColumns.size()); |
| columnInfos = Lists.transform(projectedColumns, new Function<ColumnProjector,ColumnInfo>() { |
| @Override |
| public ColumnInfo apply(final ColumnProjector columnProjector) { |
| return new ColumnInfo(columnProjector.getName(), columnProjector.getExpression().getDataType().getSqlType()); |
| } |
| |
| }); |
| } catch (SQLException e) { |
| LOG.error(String.format(" Error [%s] parsing SELECT query [%s] ",e.getMessage(),sqlQuery)); |
| throw new RuntimeException(e); |
| } finally { |
| if(connection != null) { |
| try { |
| connection.close(); |
| } catch(SQLException sqle) { |
| LOG.error("Error closing connection!!"); |
| throw new RuntimeException(sqle); |
| } |
| } |
| } |
| return columnInfos; |
| } |
| |
| } |