code: func (parser *Parser) setLastSelectFieldText(st *ast.SelectStmt, lastEnd int) {
  	lastField := st.Fields.Fields[len(st.Fields.Fields)-1]
  	if lastField.Offset+len(lastField.Text()) >= len(parser.src)-1 {
  		lastField.SetText(parser.src[lastField.Offset:lastEnd])
  	}
  }
docs: // The select statement is not at the end of the whole statement, if the last
  // field text was set from its offset to the end of the src string, update
  // the last field text.