[SPARK-26985][CORE] Fix "access only some column of the all of columns " for big endian architecture BUG

continuation to apache#24788

## What changes were proposed in this pull request?

Changes are related to BIG ENDIAN system
This changes are done to

identify s390x platform.
use byteorder to BIG_ENDIAN for big endian systems
changes for 2 are done in access functions putFloats() and putDouble()

## How was this patch tested?

Changes have been tested to build successfully on s390x as well x86 platform to make sure build is successful.

Closes apache#24861 from ketank-new/ketan_latest_v2.3.2.

Authored-by: ketank-new <[email protected]>
Signed-off-by: Sean Owen <[email protected]>

Author: ketank-new

common/unsafe/src/main/java/org/apache/spark/unsafe/Platform.java

@@ -304,7 +304,7 @@ public static void throwException(Throwable t) {
   static {
     boolean _unaligned;
     String arch = System.getProperty("os.arch", "");
-    if (arch.equals("ppc64le") || arch.equals("ppc64")) {
+    if (arch.equals("ppc64le") || arch.equals("ppc64") || arch.equals("s390x")) {
       // Since java.nio.Bits.unaligned() doesn't return true on ppc (See JDK-8165231), but
       // ppc64 and ppc64le support it
       _unaligned = true;

sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OffHeapColumnVector.java

@@ -417,7 +417,7 @@ public void putFloats(int rowId, int count, byte[] src, int srcIndex) {
       Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET + srcIndex,
           null, data + rowId * 4L, count * 4L);
     } else {
-      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.LITTLE_ENDIAN);
+      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.BIG_ENDIAN);
       long offset = data + 4L * rowId;
       for (int i = 0; i < count; ++i, offset += 4) {
         Platform.putFloat(null, offset, bb.getFloat(srcIndex + (4 * i)));
@@ -472,7 +472,7 @@ public void putDoubles(int rowId, int count, byte[] src, int srcIndex) {
       Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET + srcIndex,
         null, data + rowId * 8L, count * 8L);
     } else {
-      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.LITTLE_ENDIAN);
+      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.BIG_ENDIAN);
       long offset = data + 8L * rowId;
       for (int i = 0; i < count; ++i, offset += 8) {
         Platform.putDouble(null, offset, bb.getDouble(srcIndex + (8 * i)));

sql/core/src/main/java/org/apache/spark/sql/execution/vectorized/OnHeapColumnVector.java

@@ -396,7 +396,7 @@ public void putFloats(int rowId, int count, byte[] src, int srcIndex) {
       Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET + srcIndex, floatData,
           Platform.DOUBLE_ARRAY_OFFSET + rowId * 4L, count * 4L);
     } else {
-      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.LITTLE_ENDIAN);
+      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.BIG_ENDIAN);
       for (int i = 0; i < count; ++i) {
         floatData[i + rowId] = bb.getFloat(srcIndex + (4 * i));
       }
@@ -445,7 +445,7 @@ public void putDoubles(int rowId, int count, byte[] src, int srcIndex) {
       Platform.copyMemory(src, Platform.BYTE_ARRAY_OFFSET + srcIndex, doubleData,
           Platform.DOUBLE_ARRAY_OFFSET + rowId * 8L, count * 8L);
     } else {
-      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.LITTLE_ENDIAN);
+      ByteBuffer bb = ByteBuffer.wrap(src).order(ByteOrder.BIG_ENDIAN);
       for (int i = 0; i < count; ++i) {
         doubleData[i + rowId] = bb.getDouble(srcIndex + (8 * i));
       }