Textfile and parquet,the two format both cause data confusion.
. At 2017-10-12 14:41:02, "Alexander Behm" <alex.b...@cloudera.com> wrote: >What's the file format? > >On Wed, Oct 11, 2017 at 11:30 PM, sky <x_h...@163.com> wrote: > >> Hi all, >> After using the 'alter table ... drop columns ...' to delete the middle >> column, then the select query will appear data confusion, how to solve it ?
