insert assert to ensure Unsafe.sizeInBytes is a multiple of 8

Author: kiszk

sql/catalyst/src/main/java/org/apache/spark/sql/catalyst/expressions/UnsafeRow.java

@@ -167,6 +167,7 @@ public UnsafeRow() {}
    */
   public void pointTo(Object baseObject, long baseOffset, int sizeInBytes) {
     assert numFields >= 0 : "numFields (" + numFields + ") should >= 0";
+    assert sizeInBytes % 8 == 0 : "sizeInBytes (" + sizeInBytes + ") should be a multiple of 8";
     this.baseObject = baseObject;
     this.baseOffset = baseOffset;
     this.sizeInBytes = sizeInBytes;
@@ -183,6 +184,7 @@ public void pointTo(byte[] buf, int sizeInBytes) {
   }
 
   public void setTotalSize(int sizeInBytes) {
+    assert sizeInBytes % 8 == 0 : "sizeInBytes (" + sizeInBytes + ") should be a multiple of 8";
     this.sizeInBytes = sizeInBytes;
   }
 
@@ -538,6 +540,7 @@ public void copyFrom(UnsafeRow row) {
       row.baseObject, row.baseOffset, this.baseObject, this.baseOffset, row.sizeInBytes);
     // update the sizeInBytes.
     this.sizeInBytes = row.sizeInBytes;
+    assert sizeInBytes % 8 == 0 : "sizeInBytes (" + sizeInBytes + ") should be a multiple of 8";
   }
 
   /**
@@ -664,6 +667,7 @@ public void writeExternal(ObjectOutput out) throws IOException {
   public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
     this.baseOffset = BYTE_ARRAY_OFFSET;
     this.sizeInBytes = in.readInt();
+    assert sizeInBytes % 8 == 0 : "sizeInBytes (" + sizeInBytes + ") should be a multiple of 8";
     this.numFields = in.readInt();
     this.bitSetWidthInBytes = calculateBitSetWidthInBytes(numFields);
     this.baseObject = new byte[sizeInBytes];
@@ -682,6 +686,7 @@ public void write(Kryo kryo, Output out) {
   public void read(Kryo kryo, Input in) {
     this.baseOffset = BYTE_ARRAY_OFFSET;
     this.sizeInBytes = in.readInt();
+    assert sizeInBytes % 8 == 0 : "sizeInBytes (" + sizeInBytes + ") should be a multiple of 8";
     this.numFields = in.readInt();
     this.bitSetWidthInBytes = calculateBitSetWidthInBytes(numFields);
     this.baseObject = new byte[sizeInBytes];