Github user babokim commented on a diff in the pull request:
https://github.com/apache/tajo/pull/232#discussion_r20343179
--- Diff:
tajo-storage/src/main/java/org/apache/tajo/storage/hbase/ColumnMapping.java ---
@@ -0,0 +1,239 @@
+/**
+ * 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.tajo.storage.hbase;
+
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.tajo.catalog.Schema;
+import org.apache.tajo.catalog.TableMeta;
+import org.apache.tajo.util.BytesUtils;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ColumnMapping {
+ public static final String KEY_COLUMN_MAPPING = "key";
+ public static final String VALUE_COLUMN_MAPPING = "value";
+
+ private TableMeta tableMeta;
+ private Schema schema;
+ private char rowKeyDelimiter;
+
+ private String hbaseTableName;
+
+ private int[] rowKeyFieldIndexes;
+ private boolean[] isRowKeyMappings;
+ private boolean[] isBinaryColumns;
+ private boolean[] isColumnKeys;
+ private boolean[] isColumnValues;
+
+ // schema order -> 0: cf name, 1: column name -> name bytes
+ private byte[][][] mappingColumns;
+
+ private int numRowKeys;
+
+ public ColumnMapping(Schema schema, TableMeta tableMeta) throws
IOException {
+ this.schema = schema;
+ this.tableMeta = tableMeta;
+
+ init();
+ }
+
+ public void init() throws IOException {
+ hbaseTableName =
tableMeta.getOption(HBaseStorageManager.META_TABLE_KEY);
+ String delim =
tableMeta.getOption(HBaseStorageManager.META_ROWKEY_DELIMITER, "").trim();
+ if (delim.length() > 0) {
+ rowKeyDelimiter = delim.charAt(0);
+ }
+ isRowKeyMappings = new boolean[schema.size()];
+ rowKeyFieldIndexes = new int[schema.size()];
+ isBinaryColumns = new boolean[schema.size()];
+ isColumnKeys = new boolean[schema.size()];
+ isColumnValues = new boolean[schema.size()];
+
+ mappingColumns = new byte[schema.size()][][];
+
+ for (int i = 0; i < schema.size(); i++) {
+ rowKeyFieldIndexes[i] = -1;
+ }
+
+ String columnMapping =
tableMeta.getOption(HBaseStorageManager.META_COLUMNS_KEY, "");
+ if (columnMapping == null || columnMapping.isEmpty()) {
+ throw new IOException("'columns' property is required.");
+ }
+
+ String[] columnMappingTokens = columnMapping.split(",");
+
+ if (columnMappingTokens.length != schema.getColumns().size()) {
+ throw new IOException("The number of mapped HBase columns is great
than the number of Tajo table columns");
+ }
+
+ int index = 0;
+ for (String eachToken: columnMappingTokens) {
+ mappingColumns[index] = new byte[2][];
+
+ byte[][] mappingTokens =
BytesUtils.splitPreserveAllTokens(eachToken.trim().getBytes(), ':');
+
+ if (mappingTokens.length == 3) {
--- End diff --
GlobalEngine calls StorageManager.beforeInsertOrCATS() before running a
insertion or creation query. In beforeInsertOrCATS() method ColumnMapping is
checked.
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