SQOOP-3014: Sqoop with HCatalog import loose precision for large numbers that does not fit into double

(Zoltan Toth via Boglarka Egyed)

src/java/org/apache/sqoop/mapreduce/hcat/SqoopHCatImportHelper.java

@@ -149,6 +149,13 @@ public SqoopHCatImportHelper(Configuration conf) throws IOException,
     LOG.debug("Static partition key used : "  + partKeysString);
   }
 
+  /* This construct is only for testing and avoiding static method
+   * usage
+   */
+  SqoopHCatImportHelper() {
+
+  }
+
   public HCatRecord convertToHCatRecord(SqoopRecord sqr) throws IOException,
     InterruptedException {
     try {
@@ -441,13 +448,24 @@ private Object convertNumberTypes(Object val, HCatFieldSchema hfs) {
       HiveChar hChar = new HiveChar(val.toString(), cti.getLength());
       return hChar;
     } else if (hfsType == HCatFieldSchema.Type.DECIMAL) {
-      BigDecimal bd = new BigDecimal(n.doubleValue(),
-        MathContext.DECIMAL128);
-      return HiveDecimal.create(bd);
+      return convertNumberIntoHiveDecimal(n);
     }
     return null;
   }
 
+  HiveDecimal convertNumberIntoHiveDecimal(Number number) {
+    BigDecimal bigDecimal = null;
+
+    if(number instanceof BigDecimal) {
+      bigDecimal = (BigDecimal) number;
+    } else if(number instanceof Long) {
+      bigDecimal = BigDecimal.valueOf((Long)number);
+    } else if (number instanceof Double) {
+      bigDecimal = BigDecimal.valueOf((Double) number);
+    }
+    return HiveDecimal.create(bigDecimal);
+  }
+
   public void cleanup() throws IOException {
     if (null != lobLoader) {
       lobLoader.close();

src/test/org/apache/sqoop/hcat/HCatalogImportTest.java

@@ -42,6 +42,7 @@
 import org.apache.hadoop.hive.common.type.HiveChar;
 import org.apache.hadoop.hive.common.type.HiveDecimal;
 import org.apache.hadoop.hive.common.type.HiveVarchar;
+import org.apache.hadoop.hive.ql.metadata.Hive;
 import org.apache.hive.hcatalog.data.HCatRecord;
 import org.apache.hive.hcatalog.data.schema.HCatFieldSchema;
 import org.apache.hive.hcatalog.data.schema.HCatSchema;
@@ -400,6 +401,36 @@ public void testFloatTypes() throws Exception {
     runHCatImport(addlArgsArray, TOTAL_RECORDS, table, cols, null);
   }
 
+  @Test
+  public void testDecimalTypes() throws Exception{
+    final int TOTAL_RECORDS = 1 * 10;
+    String hcatTable = getTableName().toUpperCase();
+    boolean allowRoundig = false;
+    String dbTypeNumeric = "numeric";
+    String dbTypeDecimal = "decimal";
+    int sqlTypeNumeric = Types.NUMERIC;
+    int sqlTypeDecimal = Types.DECIMAL;
+    HCatFieldSchema.Type hcatTypeDecimal = HCatFieldSchema.Type.DECIMAL;
+
+    BigDecimal inputValue1 = new BigDecimal("454018528782.42006329");
+    HiveDecimal expectedValue1 = HiveDecimal.create(new BigDecimal("454018528782.42006"), allowRoundig);
+    BigDecimal inputValue2 = new BigDecimal("87658675864540185.123456789123456789");
+    HiveDecimal expectedValue2 = HiveDecimal.create(new BigDecimal("87658675864540185.12346"), allowRoundig);
+    int precision = 22;
+    int scale = 5;
+
+    ColumnGenerator[] hcatColumns = new ColumnGenerator[] {
+        HCatalogTestUtils.colGenerator(HCatalogTestUtils.forIdx(0), dbTypeNumeric, sqlTypeNumeric,
+            hcatTypeDecimal, precision, scale, expectedValue1, inputValue1, KeyType.NOT_A_KEY),
+
+        HCatalogTestUtils.colGenerator(HCatalogTestUtils.forIdx(1), dbTypeDecimal, sqlTypeDecimal,
+            hcatTypeDecimal, precision, scale, expectedValue2, inputValue2, KeyType.NOT_A_KEY)
+    };
+    List<String> addlArgsArray = new ArrayList<String>();
+    setExtraArgs(addlArgsArray);
+    runHCatImport(addlArgsArray, TOTAL_RECORDS, hcatTable, hcatColumns, null);
+  }
+
   @Test
   public void testNumberTypes() throws Exception {
     final int TOTAL_RECORDS = 1 * 10;

src/test/org/apache/sqoop/mapreduce/hcat/TestSqoopHCatImportHelper.java

@@ -0,0 +1,59 @@
+/**
+ * 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.sqoop.mapreduce.hcat;
+
+import org.apache.hadoop.hive.common.type.HiveDecimal;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.math.BigDecimal;
+
+import static org.junit.Assert.assertEquals;
+
+public class TestSqoopHCatImportHelper {
+
+  private SqoopHCatImportHelper importHelper;
+
+  @Before
+  public void init() {
+    importHelper = new SqoopHCatImportHelper();
+  }
+
+  @Test
+  public void convertLongNumberIntoBigDecimalWithoutRounding() {
+    Long input = new Long("20160523112914897");
+    HiveDecimal actual = importHelper.convertNumberIntoHiveDecimal(input);
+    assertEquals(new BigDecimal("20160523112914897"), actual.bigDecimalValue());
+
+  }
+  @Test
+  public void convertDoubleNumberIntoBigDecimalWithoutRounding() {
+    Double input = new Double("0.12345678912345678");
+    HiveDecimal actual = importHelper.convertNumberIntoHiveDecimal(input);
+    assertEquals(new BigDecimal("0.12345678912345678"), actual.bigDecimalValue());
+  }
+
+  @Test
+  public void keepBigDecimalNumberIfInputIsBigDecimal() {
+    BigDecimal input = new BigDecimal("87658675864540185.123456789123456789");
+    HiveDecimal actual = importHelper.convertNumberIntoHiveDecimal(input);
+    assertEquals(new BigDecimal("87658675864540185.123456789123456789"), actual.bigDecimalValue());
+  }
+
+}