docs: @Override
      public void setNull(int parameterIndex, int sqlType) throws SQLException
      {
          checkParameterBounds(parameterIndex);
          switch(sqlType)
          {
              case Types.TINYINT:
                  this.parameters[parameterIndex-1] = VoltType.NULL_TINYINT;
                  break;
              case Types.SMALLINT:
                  this.parameters[parameterIndex-1] = VoltType.NULL_SMALLINT;
                  break;
              case Types.INTEGER:
                  this.parameters[parameterIndex-1] = VoltType.NULL_INTEGER;
                  break;
              case Types.BIGINT:
                  this.parameters[parameterIndex-1] = VoltType.NULL_BIGINT;
                  break;
              case Types.DOUBLE:
                  this.parameters[parameterIndex-1] = VoltType.NULL_FLOAT;
                  break;
              case Types.DECIMAL:
                  this.parameters[parameterIndex-1] = VoltType.NULL_DECIMAL;
                  break;
              case Types.TIMESTAMP:
                  this.parameters[parameterIndex-1] = VoltType.NULL_TIMESTAMP;
                  break;
              case Types.VARBINARY:
              case Types.VARCHAR:
              case Types.NVARCHAR:
              case Types.OTHER:
              case Types.NULL:
                  this.parameters[parameterIndex-1] = VoltType.NULL_STRING_OR_VARBINARY;
                  break;
              default:
                  throw SQLError.get(SQLError.ILLEGAL_ARGUMENT);
          }
      }