Hi Jark, thanks for your feedback! And thanks for your comments in Google doc <https://docs.google.com/document/d/1tryl6swt1K1pw7yvv5pdvFXSxfrBZ3_OkOObymis2ck/edit?usp=gmail> !
Hi all community contributors, this mail discussion will continue until next Tuesday. If there are no new suggestions, I will create JIRA and start the development of new features. Best, Jincheng Jark Wu <imj...@gmail.com> 于2019年3月14日周四 下午5:28写道： > Hi jingcheng, > > Thanks for bringing up the detailed design. I think the column operation > feature is a great improvement to Table API. > > +1 to the design from my side. > > I only left a minor comment in the google doc. > > Looking forward to the feature. > > Best, > Jark > > On Mon, 11 Mar 2019 at 12:29, jincheng sun <sunjincheng...@gmail.com> > wrote: > > > Hi, ALL: > > > > Currently, there are already lots of table-level operations available in > > Table API such as the select, window, join, etc. Most functionalities can > > be accomplished with these APIs. But things may become difficult when > there > > are too many columns to operate. > > > > The difficulties can be summarized into two categories: > > > > 1. Column modification - Users have to specify all the columns even if > only > > some columns are changed, e.g. adding a column, renaming a column, etc. > > 2. Column projection - It lacks flexible column operations to express > which > > columns to be selected. e.g.: there are 100 columns, but the user is only > > interested in selecting the 1~10 and 20~40 columns. > > > > So, I propose to add the following features in the Table API: > > > > 1. Add the following operator > > - Add/Relace Columns > > - Drop columns > > - Rename columns > > > > 2. Add column selection utils > > - columns(...) - select the specified columns > > - -columns(...) - deselect the columns specified > > > > For more details, please check out the Google doc > > < > > > https://docs.google.com/document/d/1tryl6swt1K1pw7yvv5pdvFXSxfrBZ3_OkOObymis2ck/edit?usp=sharing > > >. > > You are welcome to leave a comment in the Google doc > > < > > > https://docs.google.com/document/d/1tryl6swt1K1pw7yvv5pdvFXSxfrBZ3_OkOObymis2ck/edit?usp=sharing > > > > > and welcome any email feedback!z > > > > Regards, > > Jincheng > > >
