| // 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.impala.catalog; |
| |
| import org.apache.impala.thrift.TColumn; |
| |
| // Describes an HBase column mapped to a Hive column (as described in the metastore). |
| // this.name describes the column name in Hive. |
| // This class adds the HBase columnFamily and columnQualifier, |
| // so we can read the column from HBase directly. |
| public class HBaseColumn extends Column implements Comparable<HBaseColumn> { |
| private final String columnFamily_; |
| private final String columnQualifier_; |
| private final boolean binaryEncoded_; |
| |
| public HBaseColumn(String name, String columnFamily, String columnQualifier, |
| boolean binaryEncoded, Type type, String comment, int position) { |
| super(name, type, comment, position); |
| columnFamily_ = CatalogInterners.internString(columnFamily); |
| columnQualifier_ = columnQualifier; |
| binaryEncoded_ = binaryEncoded; |
| } |
| |
| public String getColumnFamily() { return columnFamily_; } |
| public String getColumnQualifier() { return columnQualifier_; } |
| public boolean isBinaryEncoded() { return binaryEncoded_; } |
| |
| @Override |
| // We order the HBase columns in the matadata based on columnFamily,columnQualifier, |
| // to more easily map slots from HBase's Result.raw() to target slots in the backend. |
| public int compareTo(HBaseColumn o) { |
| int familyCmp = columnFamily_.compareTo(o.columnFamily_); |
| if (familyCmp != 0) { |
| return familyCmp; |
| } |
| int qualifierCmp = columnQualifier_.compareTo(o.columnQualifier_); |
| return qualifierCmp; |
| } |
| |
| @Override |
| public TColumn toThrift() { |
| TColumn colDesc = new TColumn(name_, type_.toThrift()); |
| if (comment_ != null) colDesc.setComment(comment_); |
| colDesc.setCol_stats(getStats().toThrift()); |
| colDesc.setPosition(position_); |
| colDesc.setIs_hbase_column(true); |
| colDesc.setColumn_family(columnFamily_); |
| colDesc.setColumn_qualifier(columnQualifier_); |
| colDesc.setIs_binary(binaryEncoded_); |
| return colDesc; |
| } |
| } |