code: @Override
    public QueryBuilder<V> where(String conditions) {
      Preconditions.checkNotNull(conditions, "WHERE clause cannot be null");
      conditions = removeKeyword(conditions, WHERE);
      this.where = conditions;
      return this;
    }
docs: Sets the statement WHERE clause in the form of<br><br>
  <code>"WHERE &lt;condition&gt; {[AND | OR] &lt;condition&gt; ...}"</code>
  <br><br>
  e.g. "a = b OR b = c". The "WHERE " keyword will be ignored.
  @param conditions the statement query without "WHERE"
  @return a reference to this object