Hi Liang, Thanks for reviewing the document. Please find my answers inline.
1.For "change of data type" , whether only support from INT to BIGINT, or not ? - Yes as part of initial feature development we will support only upcasting the datatype INT to BIGINT and decimal datatype change from lower to higher precision. 2.Whether support adjust the order of columns for MDK , and make compaction to resort data as per the new order of columns , or not ? - Currently addition of column is supported only at the end. From my opinion once this is stable, we can further extend it to support reordering of columns to change the MDKEY order. Regards Manish Gupta On Fri, Mar 10, 2017 at 5:20 AM, Liang Chen <chenliang6...@gmail.com> wrote: > Hi > > Thanks for you started this discussion for alter table feature. > > A couple of comments: > 1.For "change of data type" , whether only support from INT to BIGINT, or > not ? > 2.Whether support adjust the order of columns for MDK , and make compaction > to resort data as per the new order of columns , or not ? > > Regards > Liang > > 2017-03-09 21:00 GMT+08:00 manish gupta <tomanishgupt...@gmail.com>: > > > Hi All, > > > > Currently in carbondata after a table is created once it becomes > immutable. > > Deletion or addition of column is not supported because of which the same > > table and data cannot be used again. To add more flexibility to the > > carbondata system alter table support needs to be added to carbondata > > system. > > > > > > Please refer the design document at below location and share your > > suggestions. > > > > > > https://drive.google.com/file/d/0B1DnrpMgGOu9dGxYMzVJUXEyZG8/ > > view?usp=sharing > > > > > > Regards > > > > Manish Gupta > > > > > > -- > Regards > Liang >
