code: String toWhereConditionPart() {
          if (mPreviousToken != ESqlToken.VALUE && mPreviousToken != ESqlToken.WHERE) {
              throw new D6RuntimeException("Where condition is not completed." + " '" + mSgSQL.toString() + "'<==error occurred around here.");
          }
          return mSgSQL.toString();
      }
docs: where condition part
  
  @return