Github user Vlad-Storona commented on a diff in the pull request:
https://github.com/apache/drill/pull/774#discussion_r148957508
--- Diff:
contrib/storage-opentsdb/src/main/java/org/apache/drill/exec/store/openTSDB/client/Schema.java
---
@@ -0,0 +1,119 @@
+/*
+ * 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.openTSDB.client;
+
+import org.apache.drill.exec.store.openTSDB.dto.ColumnDTO;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+
+import static org.apache.drill.exec.store.openTSDB.Constants.*;
+import static org.apache.drill.exec.store.openTSDB.Util.getValidTableName;
+import static
org.apache.drill.exec.store.openTSDB.client.Schema.DefaultColumns.AGGREGATED_VALUE;
+import static
org.apache.drill.exec.store.openTSDB.client.Schema.DefaultColumns.AGGREGATE_TAGS;
+import static
org.apache.drill.exec.store.openTSDB.client.Schema.DefaultColumns.METRIC;
+import static
org.apache.drill.exec.store.openTSDB.client.Schema.DefaultColumns.TIMESTAMP;
+
+/**
+ * Abstraction for representing structure of openTSDB table
+ */
+public class Schema {
+
+ private static final Logger log =
+ LoggerFactory.getLogger(Schema.class);
+
+ private final List<ColumnDTO> columns = new ArrayList<>();
+ private final Service db;
+ private final String name;
+
+ public Schema(Service db, String name) {
+ this.db = db;
+ this.name = name;
+ setupStructure();
+ }
+
+ private void setupStructure() {
+ columns.add(new ColumnDTO(METRIC.toString(), OpenTSDBTypes.STRING));
+ columns.add(new ColumnDTO(AGGREGATE_TAGS.toString(),
OpenTSDBTypes.STRING));
+ columns.add(new ColumnDTO(TIMESTAMP.toString(),
OpenTSDBTypes.TIMESTAMP));
+ columns.add(new ColumnDTO(AGGREGATED_VALUE.toString(),
OpenTSDBTypes.DOUBLE));
+ columns.addAll(db.getUnfixedColumns(getParamsForQuery()));
+ }
+
+ /**
+ * Return list with all columns names and its types
+ *
+ * @return List<ColumnDTO>
+ */
+ public List<ColumnDTO> getColumns() {
+ return Collections.unmodifiableList(columns);
+ }
+
+ /**
+ * Number of columns in table
+ *
+ * @return number of table columns
+ */
+ public int getColumnCount() {
+ return columns.size();
+ }
+
+ /**
+ * @param columnIndex index of required column in table
+ * @return ColumnDTO
+ */
+ public ColumnDTO getColumnByIndex(int columnIndex) {
+ return columns.get(columnIndex);
+ }
+
+ // Create map with required params, for querying metrics.
+ // Without this params, we cannot make API request to db.
+ private HashMap<String, String> getParamsForQuery() {
--- End diff --
Ok.
---
