fix bit to long bug

Signed-off-by: shiyuhang <1136742008@qq.com>

Author: shiyuhang0

src/main/java/org/tikv/common/columnar/TiChunkColumnVector.java

@@ -178,7 +178,7 @@ private long getLongFromBinary(int rowId) {
     if (bytes.length == 0) return 0;
     long result = 0;
     for (byte b : bytes) {
-      result = (result << 8) | b;
+      result = (result << 8) | (b & 0xff);
     }
     return result;
   }