code: func (f *Field) Set(rowIDOrKey, colIDOrKey interface{}) *PQLBaseQuery {
  	rowStr, colStr, err := formatRowColIDKey(rowIDOrKey, colIDOrKey)
  	if err != nil {
  		return NewPQLBaseQuery("", f.index, err)
  	}
  	text := fmt.Sprintf("Set(%s,%s=%s)", colStr, f.name, rowStr)
  	q := NewPQLBaseQuery(text, f.index, nil)
  	q.hasKeys = f.options.keys || f.index.options.keys
  	return q
  }
docs: // Set creates a Set query.
  // Set, assigns a value of 1 to a bit in the binary matrix, thus associating the given row in the given field with the given column.