/**
* Licensed 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.hadoop.hive.ql.io.parquet;
import static org.junit.Assert.assertEquals;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.hive.ql.io.parquet.convert.HiveSchemaConverter;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;
import org.junit.Test;
import parquet.schema.MessageType;
import parquet.schema.MessageTypeParser;
public class TestHiveSchemaConverter {
private List<String> createHiveColumnsFrom(final String columnNamesStr) {
List<String> columnNames;
if (columnNamesStr.length() == 0) {
columnNames = new ArrayList<String>();
} else {
columnNames = Arrays.asList(columnNamesStr.split(","));
}
return columnNames;
}
private List<TypeInfo> createHiveTypeInfoFrom(final String columnsTypeStr) {
List<TypeInfo> columnTypes;
if (columnsTypeStr.length() == 0) {
columnTypes = new ArrayList<TypeInfo>();
} else {
columnTypes = TypeInfoUtils.getTypeInfosFromTypeString(columnsTypeStr);
}
return columnTypes;
}
private void testConversion(final String columnNamesStr, final String columnsTypeStr, final String expectedSchema) throws Exception {
final List<String> columnNames = createHiveColumnsFrom(columnNamesStr);
final List<TypeInfo> columnTypes = createHiveTypeInfoFrom(columnsTypeStr);
final MessageType messageTypeFound = HiveSchemaConverter.convert(columnNames, columnTypes);
final MessageType expectedMT = MessageTypeParser.parseMessageType(expectedSchema);
assertEquals("converting " + columnNamesStr + ": " + columnsTypeStr + " to " + expectedSchema, expectedMT, messageTypeFound);
}
@Test
public void testSimpleType() throws Exception {
testConversion(
"a,b,c",
"int,double,boolean",
"message hive_schema {\n"
+ " optional int32 a;\n"
+ " optional double b;\n"
+ " optional boolean c;\n"
+ "}\n");
}
@Test
public void testArray() throws Exception {
testConversion("arrayCol",
"array<int>",
"message hive_schema {\n"
+ " optional group arrayCol (LIST) {\n"
+ " repeated group bag {\n"
+ " optional int32 array_element;\n"
+ " }\n"
+ " }\n"
+ "}\n");
}
@Test
public void testStruct() throws Exception {
testConversion("structCol",
"struct<a:int,b:double,c:boolean>",
"message hive_schema {\n"
+ " optional group structCol {\n"
+ " optional int32 a;\n"
+ " optional double b;\n"
+ " optional boolean c;\n"
+ " }\n"
+ "}\n");
}
@Test
public void testMap() throws Exception {
testConversion("mapCol",
"map<string,string>",
"message hive_schema {\n"
+ " optional group mapCol (MAP) {\n"
+ " repeated group map (MAP_KEY_VALUE) {\n"
+ " required binary key;\n"
+ " optional binary value;\n"
+ " }\n"
+ " }\n"
+ "}\n");
}
}