[SPARK-17495][SQL] Add more tests for hive hash

## What changes were proposed in this pull request?

This PR adds tests hive-hash by comparing the outputs generated against Hive 1.2.1. Following datatypes are covered by this PR:
- null
- boolean
- byte
- short
- int
- long
- float
- double
- string
- array
- map
- struct

Datatypes that I have _NOT_ covered but I will work on separately are:
- Decimal (handled separately in https://github.com/apache/spark/pull/17056)
- TimestampType
- DateType
- CalendarIntervalType

## How was this patch tested?

NA

Author: Tejas Patil <tejasp@fb.com>

Closes #17049 from tejasapatil/SPARK-17495_remaining_types.

1 files changed, 1 insertions, 1 deletions

diff --git a/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/expressions/HiveHasher.java b/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/expressions/HiveHasher.java
index c7ea9085eb..73577437ac 100644
--- a/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/expressions/HiveHasher.java
+++ b/common/unsafe/src/main/java/org/apache/spark/sql/catalyst/expressions/HiveHasher.java
@@ -20,7 +20,7 @@ package org.apache.spark.sql.catalyst.expressions;
 import org.apache.spark.unsafe.Platform;
 
 /**
- * Simulates Hive's hashing function at
+ * Simulates Hive's hashing function from Hive v1.2.1
  * org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils#hashcode()
  */
 public class HiveHasher {