code: public static boolean voltMutateToBigintType(Expression maybeConstantNode, Expression parent, int childIndex) {
          if (maybeConstantNode.opType == OpTypes.VALUE
                  && maybeConstantNode.dataType != null
                  && maybeConstantNode.dataType.isBinaryType()) {
              ExpressionValue exprVal = (ExpressionValue)maybeConstantNode;
              if (exprVal.valueData == null) {
                  return false;
              }
  
              BinaryData data = (BinaryData)exprVal.valueData;
              parent.nodes[childIndex] = new ExpressionValue(data.toLong(), Type.SQL_BIGINT);
  
              return true;
          }
          return false;
      }
docs: Given a ExpressionValue that is a VARBINARY constant,
  convert it to a BIGINT constant.  Returns true for a
  successful conversion and false otherwise.
  
  For more details on how the conversion is performed, see BinaryData.toLong().
  
  @param parent      Reference of parent expression
  @param childIndex  Index of this node in parent
  @return true for a successful conversion and false otherwise.