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/store/sdk/src/main/java/org/apache/carbondata/sdk/file/CarbonSchemaReader.java

/*
 * 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.carbondata.sdk.file;

import java.io.DataInputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

import org.apache.carbondata.core.constants.CarbonCommonConstants;
import org.apache.carbondata.core.datastore.FileReader;
import org.apache.carbondata.core.datastore.filesystem.CarbonFile;
import org.apache.carbondata.core.datastore.filesystem.CarbonFileFilter;
import org.apache.carbondata.core.datastore.impl.FileFactory;
import org.apache.carbondata.core.metadata.converter.SchemaConverter;
import org.apache.carbondata.core.metadata.converter.ThriftWrapperSchemaConverterImpl;
import org.apache.carbondata.core.metadata.schema.table.column.ColumnSchema;
import org.apache.carbondata.core.reader.CarbonFooterReaderV3;
import org.apache.carbondata.core.reader.CarbonHeaderReader;
import org.apache.carbondata.core.reader.CarbonIndexFileReader;
import org.apache.carbondata.core.util.CarbonUtil;
import org.apache.carbondata.format.FileFooter3;
import org.apache.carbondata.processing.loading.exception.CarbonDataLoadingException;
import org.apache.carbondata.sdk.file.arrow.ArrowConverter;

import static org.apache.carbondata.core.util.CarbonUtil.thriftColumnSchemaToWrapperColumnSchema;
import static org.apache.carbondata.core.util.path.CarbonTablePath.CARBON_DATA_EXT;
import static org.apache.carbondata.core.util.path.CarbonTablePath.INDEX_FILE_EXT;

import org.apache.hadoop.conf.Configuration;

/**
 * Schema reader for carbon files, including carbondata file, carbonindex file, and schema file
 */
public class CarbonSchemaReader {

  /**
   * Read schema file and return the schema
   *
   * @param schemaFilePath complete path including schema file name
   * @return schema object
   * @throws IOException
   */
  @Deprecated
  public static Schema readSchemaInSchemaFile(String schemaFilePath) throws IOException {
    org.apache.carbondata.format.TableInfo tableInfo = CarbonUtil.readSchemaFile(schemaFilePath);
    SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();
    List<ColumnSchema> schemaList = schemaConverter
        .fromExternalToWrapperTableInfo(tableInfo, "", "", "")
        .getFactTable()
        .getListOfColumns();
    return new Schema(schemaList);
  }

  /**
   * get carbondata/carbonindex file in path
   *
   * @param path      carbon file path
   * @param extension carbon file extension
   * @param conf      hadoop configuration support, can set s3a AK,SK,
   *                  end point and other conf with this
   * @return CarbonFile array
   */
  private static CarbonFile[] getCarbonFile(String path, final String extension, Configuration conf)
      throws IOException {
    String dataFilePath = path;
    if (!(dataFilePath.endsWith(extension))) {
      CarbonFile[] carbonFiles = FileFactory
          .getCarbonFile(path, conf)
          .listFiles(new CarbonFileFilter() {
            @Override
            public boolean accept(CarbonFile file) {
              if (file == null) {
                return false;
              }
              return file.getName().endsWith(extension);
            }
          });
      if (carbonFiles == null || carbonFiles.length < 1) {
        throw new IOException("Carbon file not exists.");
      }
      return carbonFiles;
    } else {
      throw new CarbonDataLoadingException("Please ensure path "
          + path + " end with " + extension);
    }
  }

  /**
   * read schema from path,
   * path can be folder path, carbonindex file path, and carbondata file path
   * and will not check all files schema
   *
   * @param path file/folder path
   * @return schema
   * @throws IOException
   */
  public static Schema readSchema(String path) throws IOException {
    Configuration conf = new Configuration();
    return readSchema(path, false, conf);
  }

  /**
   * Converting carbon schema to arrow schema in byte[],
   * byte[] can be converted back arrowSchema by other arrow interface module like pyspark etc.
   *
   * @param path
   * @return
   * @throws IOException
   */
  public static byte[] getArrowSchemaAsBytes(String path) throws IOException {
    Schema schema = CarbonSchemaReader.readSchema(path).asOriginOrder();
    ArrowConverter arrowConverter = new ArrowConverter(schema, 0);
    final byte[] bytes = arrowConverter.toSerializeArray();
    return bytes;
  }

  /**
   * read schema from path,
   * path can be folder path, carbonindex file path, and carbondata file path
   * and will not check all files schema
   *
   * @param path file/folder path
   * @param conf hadoop configuration support, can set s3a AK,SK,end point and other conf with this
   * @return schema
   * @throws IOException
   */
  public static Schema readSchema(String path, Configuration conf) throws IOException {
    return readSchema(path, false, conf);
  }

  /**
   * read schema from path,
   * path can be folder path, carbonindex file path, and carbondata file path
   * and user can decide whether check all files schema
   *
   * @param path           file/folder path
   * @param validateSchema whether check all files schema
   * @param conf           hadoop configuration support, can set s3a AK,SK,
   *                       end point and other conf with this
   * @return schema
   * @throws IOException
   */
  public static Schema readSchema(String path, boolean validateSchema, Configuration conf)
      throws IOException {
    if (path.endsWith(INDEX_FILE_EXT)) {
      return readSchemaFromIndexFile(path, conf);
    } else if (path.endsWith(CARBON_DATA_EXT)) {
      return readSchemaFromDataFile(path, conf);
    } else if (validateSchema) {
      CarbonFile[] carbonIndexFiles = getCarbonFile(path, INDEX_FILE_EXT, conf);
      Schema schema;
      if (carbonIndexFiles != null && carbonIndexFiles.length != 0) {
        schema = readSchemaFromIndexFile(carbonIndexFiles[0].getAbsolutePath(), conf);
        for (int i = 1; i < carbonIndexFiles.length; i++) {
          Schema schema2 = readSchemaFromIndexFile(carbonIndexFiles[i].getAbsolutePath(), conf);
          if (!schema.equals(schema2)) {
            throw new CarbonDataLoadingException("Schema is different between different files.");
          }
        }
        CarbonFile[] carbonDataFiles = getCarbonFile(path, CARBON_DATA_EXT, conf);
        for (int i = 0; i < carbonDataFiles.length; i++) {
          Schema schema2 = readSchemaFromDataFile(carbonDataFiles[i].getAbsolutePath(), conf);
          if (!schema.equals(schema2)) {
            throw new CarbonDataLoadingException("Schema is different between different files.");
          }
        }
        return schema;
      } else {
        throw new CarbonDataLoadingException("No carbonindex file in this path.");
      }
    } else {
      String indexFilePath = getCarbonFile(path, INDEX_FILE_EXT, conf)[0].getAbsolutePath();
      return readSchemaFromIndexFile(indexFilePath, conf);
    }
  }

  /**
   * read schema from path,
   * path can be folder path, carbonindex file path, and carbondata file path
   * and user can decide whether check all files schema
   *
   * @param path           file/folder path
   * @param validateSchema whether check all files schema
   * @return schema
   * @throws IOException
   */
  public static Schema readSchema(String path, boolean validateSchema) throws IOException {
    Configuration conf = new Configuration();
    return readSchema(path, validateSchema, conf);
  }

  /**
   * Read carbondata file and return the schema
   * This interface will be removed,
   * please use readSchema instead of this interface
   *
   * @param dataFilePath carbondata file store path
   * @return Schema object
   * @throws IOException
   */
  @Deprecated
  public static Schema readSchemaInDataFile(String dataFilePath) throws IOException {
    return readSchema(dataFilePath, false);
  }

  /**
   * Read schema from carbondata file
   *
   * @param dataFilePath carbondata file path
   * @param conf         hadoop configuration support, can set s3a AK,SK,
   *                     end point and other conf with this
   * @return carbon data schema
   * @throws IOException
   */
  private static Schema readSchemaFromDataFile(String dataFilePath, Configuration conf)
      throws IOException {
    CarbonHeaderReader reader = new CarbonHeaderReader(dataFilePath, conf);
    List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>();
    List<ColumnSchema> schemaList = reader.readSchema();
    for (int i = 0; i < schemaList.size(); i++) {
      ColumnSchema columnSchema = schemaList.get(i);
      if (!(columnSchema.getColumnName().contains("."))) {
        columnSchemaList.add(columnSchema);
      }
    }
    return new Schema(columnSchemaList);
  }

  /**
   * Read carbonindex file and return the schema
   * This interface will be removed,
   * please use readSchema instead of this interface
   *
   * @param indexFilePath complete path including index file name
   * @return schema object
   * @throws IOException
   */
  @Deprecated
  public static Schema readSchemaInIndexFile(String indexFilePath) throws IOException {
    return readSchema(indexFilePath, false);
  }

  /**
   * Read schema from carbonindex file
   *
   * @param indexFilePath carbonindex file path
   * @param conf          hadoop configuration support, can set s3a AK,SK,
   *                      end point and other conf with this
   * @return carbon data Schema
   * @throws IOException
   */
  private static Schema readSchemaFromIndexFile(String indexFilePath, Configuration conf)
      throws IOException {
    CarbonFile indexFile =
        FileFactory.getCarbonFile(indexFilePath, conf);
    if (!indexFile.getName().endsWith(INDEX_FILE_EXT)) {
      throw new IOException("Not an index file name");
    }
    // read schema from the first index file
    DataInputStream dataInputStream =
        FileFactory.getDataInputStream(indexFilePath, FileFactory.getFileType(indexFilePath), conf);
    byte[] bytes = new byte[(int) indexFile.getSize()];
    try {
      //get the file in byte buffer
      dataInputStream.readFully(bytes);
      CarbonIndexFileReader indexReader = new CarbonIndexFileReader();
      // read from byte buffer.
      indexReader.openThriftReader(bytes);
      // get the index header
      org.apache.carbondata.format.IndexHeader readIndexHeader = indexReader.readIndexHeader();
      List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>();
      List<org.apache.carbondata.format.ColumnSchema> table_columns =
          readIndexHeader.getTable_columns();
      for (org.apache.carbondata.format.ColumnSchema columnSchema : table_columns) {
        if (!(columnSchema.column_name.contains("."))) {
          columnSchemaList.add(thriftColumnSchemaToWrapperColumnSchema(columnSchema));
        }
      }
      return new Schema(columnSchemaList);
    } finally {
      dataInputStream.close();
    }
  }

  /**
   * This method return the version details in formatted string by reading from carbondata file
   *
   * @param dataFilePath
   * @return
   * @throws IOException
   */
  public static String getVersionDetails(String dataFilePath) throws IOException {
    long fileSize =
        FileFactory.getCarbonFile(dataFilePath, FileFactory.getFileType(dataFilePath)).getSize();
    FileReader fileReader = FileFactory.getFileHolder(FileFactory.getFileType(dataFilePath));
    ByteBuffer buffer =
        fileReader.readByteBuffer(FileFactory.getUpdatedFilePath(dataFilePath), fileSize - 8, 8);
    fileReader.finish();
    CarbonFooterReaderV3 footerReader = new CarbonFooterReaderV3(dataFilePath, buffer.getLong());
    FileFooter3 footer = footerReader.readFooterVersion3();
    if (null != footer.getExtra_info()) {
      return footer.getExtra_info().get(CarbonCommonConstants.CARBON_WRITTEN_BY_FOOTER_INFO)
          + " in version: " + footer.getExtra_info()
          .get(CarbonCommonConstants.CARBON_WRITTEN_VERSION);
    } else {
      return "Version Details are not found in carbondata file";
    }
  }
}

1	/*
2	* Licensed to the Apache Software Foundation (ASF) under one or more
3	* contributor license agreements. See the NOTICE file distributed with
4	* this work for additional information regarding copyright ownership.
5	* The ASF licenses this file to You under the Apache License, Version 2.0
6	* (the "License"); you may not use this file except in compliance with
7	* the License. You may obtain a copy of the License at
8	*
9	* http://www.apache.org/licenses/LICENSE-2.0
10	*
11	* Unless required by applicable law or agreed to in writing, software
12	* distributed under the License is distributed on an "AS IS" BASIS,
13	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14	* See the License for the specific language governing permissions and
15	* limitations under the License.
16	*/
17
18	package org.apache.carbondata.sdk.file;
19
20	import java.io.DataInputStream;
21	import java.io.IOException;
22	import java.nio.ByteBuffer;
23	import java.util.ArrayList;
24	import java.util.List;
25
26	import org.apache.carbondata.core.constants.CarbonCommonConstants;
27	import org.apache.carbondata.core.datastore.FileReader;
28	import org.apache.carbondata.core.datastore.filesystem.CarbonFile;
29	import org.apache.carbondata.core.datastore.filesystem.CarbonFileFilter;
30	import org.apache.carbondata.core.datastore.impl.FileFactory;
31	import org.apache.carbondata.core.metadata.converter.SchemaConverter;
32	import org.apache.carbondata.core.metadata.converter.ThriftWrapperSchemaConverterImpl;
33	import org.apache.carbondata.core.metadata.schema.table.column.ColumnSchema;
34	import org.apache.carbondata.core.reader.CarbonFooterReaderV3;
35	import org.apache.carbondata.core.reader.CarbonHeaderReader;
36	import org.apache.carbondata.core.reader.CarbonIndexFileReader;
37	import org.apache.carbondata.core.util.CarbonUtil;
38	import org.apache.carbondata.format.FileFooter3;
39	import org.apache.carbondata.processing.loading.exception.CarbonDataLoadingException;
40	import org.apache.carbondata.sdk.file.arrow.ArrowConverter;
41
42	import static org.apache.carbondata.core.util.CarbonUtil.thriftColumnSchemaToWrapperColumnSchema;
43	import static org.apache.carbondata.core.util.path.CarbonTablePath.CARBON_DATA_EXT;
44	import static org.apache.carbondata.core.util.path.CarbonTablePath.INDEX_FILE_EXT;
45
46	import org.apache.hadoop.conf.Configuration;
47
48	/**
49	* Schema reader for carbon files, including carbondata file, carbonindex file, and schema file
50	*/
51	public class CarbonSchemaReader {	×
52
53	/**
54	* Read schema file and return the schema
55	*
56	* @param schemaFilePath complete path including schema file name
57	* @return schema object
58	* @throws IOException
59	*/
60	@Deprecated
61	public static Schema readSchemaInSchemaFile(String schemaFilePath) throws IOException {
62	org.apache.carbondata.format.TableInfo tableInfo = CarbonUtil.readSchemaFile(schemaFilePath);	×
63	SchemaConverter schemaConverter = new ThriftWrapperSchemaConverterImpl();	×
64	List<ColumnSchema> schemaList = schemaConverter	×
65	.fromExternalToWrapperTableInfo(tableInfo, "", "", "")	×
66	.getFactTable()	×
67	.getListOfColumns();	×
68	return new Schema(schemaList);	×
69	}
70
71	/**
72	* get carbondata/carbonindex file in path
73	*
74	* @param path carbon file path
75	* @param extension carbon file extension
76	* @param conf hadoop configuration support, can set s3a AK,SK,
77	* end point and other conf with this
78	* @return CarbonFile array
79	*/
80	private static CarbonFile[] getCarbonFile(String path, final String extension, Configuration conf)
81	throws IOException {
82	String dataFilePath = path;	2✔
83	if (!(dataFilePath.endsWith(extension))) {	2✔
84	CarbonFile[] carbonFiles = FileFactory	2✔
85	.getCarbonFile(path, conf)	2✔
86	.listFiles(new CarbonFileFilter() {	2✔
87	@Override
88	public boolean accept(CarbonFile file) {
89	if (file == null) {	2✔
90	return false;	×
91	}
92	return file.getName().endsWith(extension);	2✔
93	}
94	});
95	if (carbonFiles == null \|\| carbonFiles.length < 1) {	2✔
96	throw new IOException("Carbon file not exists.");	×
97	}
98	return carbonFiles;	2✔
99	} else {
100	throw new CarbonDataLoadingException("Please ensure path "	×
101	+ path + " end with " + extension);
102	}
103	}
104
105	/**
106	* read schema from path,
107	* path can be folder path, carbonindex file path, and carbondata file path
108	* and will not check all files schema
109	*
110	* @param path file/folder path
111	* @return schema
112	* @throws IOException
113	*/
114	public static Schema readSchema(String path) throws IOException {
115	Configuration conf = new Configuration();	2✔
116	return readSchema(path, false, conf);	2✔
117	}
118
119	/**
120	* Converting carbon schema to arrow schema in byte[],
121	* byte[] can be converted back arrowSchema by other arrow interface module like pyspark etc.
122	*
123	* @param path
124	* @return
125	* @throws IOException
126	*/
127	public static byte[] getArrowSchemaAsBytes(String path) throws IOException {
128	Schema schema = CarbonSchemaReader.readSchema(path).asOriginOrder();	2✔
129	ArrowConverter arrowConverter = new ArrowConverter(schema, 0);	2✔
130	final byte[] bytes = arrowConverter.toSerializeArray();	2✔
131	return bytes;	2✔
132	}
133
134	/**
135	* read schema from path,
136	* path can be folder path, carbonindex file path, and carbondata file path
137	* and will not check all files schema
138	*
139	* @param path file/folder path
140	* @param conf hadoop configuration support, can set s3a AK,SK,end point and other conf with this
141	* @return schema
142	* @throws IOException
143	*/
144	public static Schema readSchema(String path, Configuration conf) throws IOException {
145	return readSchema(path, false, conf);	×
146	}
147
148	/**
149	* read schema from path,
150	* path can be folder path, carbonindex file path, and carbondata file path
151	* and user can decide whether check all files schema
152	*
153	* @param path file/folder path
154	* @param validateSchema whether check all files schema
155	* @param conf hadoop configuration support, can set s3a AK,SK,
156	* end point and other conf with this
157	* @return schema
158	* @throws IOException
159	*/
160	public static Schema readSchema(String path, boolean validateSchema, Configuration conf)
161	throws IOException {
162	if (path.endsWith(INDEX_FILE_EXT)) {	2✔
163	return readSchemaFromIndexFile(path, conf);	2✔
164	} else if (path.endsWith(CARBON_DATA_EXT)) {	2✔
165	return readSchemaFromDataFile(path, conf);	2✔
166	} else if (validateSchema) {	2✔
167	CarbonFile[] carbonIndexFiles = getCarbonFile(path, INDEX_FILE_EXT, conf);	2✔
168	Schema schema;
169	if (carbonIndexFiles != null && carbonIndexFiles.length != 0) {	2✔
170	schema = readSchemaFromIndexFile(carbonIndexFiles[0].getAbsolutePath(), conf);	2✔
171	for (int i = 1; i < carbonIndexFiles.length; i++) {	2✔
172	Schema schema2 = readSchemaFromIndexFile(carbonIndexFiles[i].getAbsolutePath(), conf);	2✔
173	if (!schema.equals(schema2)) {	2✔
174	throw new CarbonDataLoadingException("Schema is different between different files.");	2✔
175	}
176	}
177	CarbonFile[] carbonDataFiles = getCarbonFile(path, CARBON_DATA_EXT, conf);	2✔
178	for (int i = 0; i < carbonDataFiles.length; i++) {	2✔
179	Schema schema2 = readSchemaFromDataFile(carbonDataFiles[i].getAbsolutePath(), conf);	2✔
180	if (!schema.equals(schema2)) {	2✔
181	throw new CarbonDataLoadingException("Schema is different between different files.");	×
182	}
183	}
184	return schema;	2✔
185	} else {
186	throw new CarbonDataLoadingException("No carbonindex file in this path.");	×
187	}
188	} else {
189	String indexFilePath = getCarbonFile(path, INDEX_FILE_EXT, conf)[0].getAbsolutePath();	2✔
190	return readSchemaFromIndexFile(indexFilePath, conf);	2✔
191	}
192	}
193
194	/**
195	* read schema from path,
196	* path can be folder path, carbonindex file path, and carbondata file path
197	* and user can decide whether check all files schema
198	*
199	* @param path file/folder path
200	* @param validateSchema whether check all files schema
201	* @return schema
202	* @throws IOException
203	*/
204	public static Schema readSchema(String path, boolean validateSchema) throws IOException {
205	Configuration conf = new Configuration();	2✔
206	return readSchema(path, validateSchema, conf);	2✔
207	}
208
209	/**
210	* Read carbondata file and return the schema
211	* This interface will be removed,
212	* please use readSchema instead of this interface
213	*
214	* @param dataFilePath carbondata file store path
215	* @return Schema object
216	* @throws IOException
217	*/
218	@Deprecated
219	public static Schema readSchemaInDataFile(String dataFilePath) throws IOException {
220	return readSchema(dataFilePath, false);	×
221	}
222
223	/**
224	* Read schema from carbondata file
225	*
226	* @param dataFilePath carbondata file path
227	* @param conf hadoop configuration support, can set s3a AK,SK,
228	* end point and other conf with this
229	* @return carbon data schema
230	* @throws IOException
231	*/
232	private static Schema readSchemaFromDataFile(String dataFilePath, Configuration conf)
233	throws IOException {
234	CarbonHeaderReader reader = new CarbonHeaderReader(dataFilePath, conf);	2✔
235	List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>();	2✔
236	List<ColumnSchema> schemaList = reader.readSchema();	2✔
237	for (int i = 0; i < schemaList.size(); i++) {	2✔
238	ColumnSchema columnSchema = schemaList.get(i);	2✔
239	if (!(columnSchema.getColumnName().contains("."))) {	2✔
240	columnSchemaList.add(columnSchema);	2✔
241	}
242	}
243	return new Schema(columnSchemaList);	2✔
244	}
245
246	/**
247	* Read carbonindex file and return the schema
248	* This interface will be removed,
249	* please use readSchema instead of this interface
250	*
251	* @param indexFilePath complete path including index file name
252	* @return schema object
253	* @throws IOException
254	*/
255	@Deprecated
256	public static Schema readSchemaInIndexFile(String indexFilePath) throws IOException {
257	return readSchema(indexFilePath, false);	×
258	}
259
260	/**
261	* Read schema from carbonindex file
262	*
263	* @param indexFilePath carbonindex file path
264	* @param conf hadoop configuration support, can set s3a AK,SK,
265	* end point and other conf with this
266	* @return carbon data Schema
267	* @throws IOException
268	*/
269	private static Schema readSchemaFromIndexFile(String indexFilePath, Configuration conf)
270	throws IOException {
271	CarbonFile indexFile =	2✔
272	FileFactory.getCarbonFile(indexFilePath, conf);	2✔
273	if (!indexFile.getName().endsWith(INDEX_FILE_EXT)) {	2✔
274	throw new IOException("Not an index file name");	×
275	}
276	// read schema from the first index file
277	DataInputStream dataInputStream =	2✔
278	FileFactory.getDataInputStream(indexFilePath, FileFactory.getFileType(indexFilePath), conf);	2✔
279	byte[] bytes = new byte[(int) indexFile.getSize()];	2✔
280	try {
281	//get the file in byte buffer
282	dataInputStream.readFully(bytes);	2✔
283	CarbonIndexFileReader indexReader = new CarbonIndexFileReader();	2✔
284	// read from byte buffer.
285	indexReader.openThriftReader(bytes);	2✔
286	// get the index header
287	org.apache.carbondata.format.IndexHeader readIndexHeader = indexReader.readIndexHeader();	2✔
288	List<ColumnSchema> columnSchemaList = new ArrayList<ColumnSchema>();	2✔
289	List<org.apache.carbondata.format.ColumnSchema> table_columns =	2✔
290	readIndexHeader.getTable_columns();	2✔
291	for (org.apache.carbondata.format.ColumnSchema columnSchema : table_columns) {	2✔
292	if (!(columnSchema.column_name.contains("."))) {	2✔
293	columnSchemaList.add(thriftColumnSchemaToWrapperColumnSchema(columnSchema));	2✔
294	}
295	}	2✔
296	return new Schema(columnSchemaList);	2✔
297	} finally {
298	dataInputStream.close();	2✔
299	}	×
300	}
301
302	/**
303	* This method return the version details in formatted string by reading from carbondata file
304	*
305	* @param dataFilePath
306	* @return
307	* @throws IOException
308	*/
309	public static String getVersionDetails(String dataFilePath) throws IOException {
310	long fileSize =	2✔
311	FileFactory.getCarbonFile(dataFilePath, FileFactory.getFileType(dataFilePath)).getSize();	2✔
312	FileReader fileReader = FileFactory.getFileHolder(FileFactory.getFileType(dataFilePath));	2✔
313	ByteBuffer buffer =	2✔
314	fileReader.readByteBuffer(FileFactory.getUpdatedFilePath(dataFilePath), fileSize - 8, 8);	2✔
315	fileReader.finish();	2✔
316	CarbonFooterReaderV3 footerReader = new CarbonFooterReaderV3(dataFilePath, buffer.getLong());	2✔
317	FileFooter3 footer = footerReader.readFooterVersion3();	2✔
318	if (null != footer.getExtra_info()) {	2✔
319	return footer.getExtra_info().get(CarbonCommonConstants.CARBON_WRITTEN_BY_FOOTER_INFO)	2✔
320	+ " in version: " + footer.getExtra_info()	2✔
321	.get(CarbonCommonConstants.CARBON_WRITTEN_VERSION);	2✔
322	} else {
323	return "Version Details are not found in carbondata file";	×
324	}
325	}
326	}

apache / carbondata / 3600

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