In hive the column names are restricted by alpha-numeric and _ (and not
beginning with _)
Why it was done ? For my understanding, to avoid the unnecessary complexity
in query parsing or grammer building.
hive dev will have definite answer :)
On Tue, Oct 8, 2013 at 11:56 PM, Zhang Xiaoyu <[EMAIL PROTECTED]>wrote:
> The columns in my Hive table had better include some special characters
> like / # -
> However, I found Hive doesn't allow it, and doesn't allow using \ as
> escape character.
> all below query fail
> create table test ( "user\/hive" String);
> create table test ( "user\\/hive" String);
> create table test ( user\/hive String);
> create table test ( user\\/hive String);
> create table test ( user/hive String);
> also, although Hive does allow _ in column name, but it doesn't special
> character as begging of the column name
> this query fail:
> create table test ( _user_hive String);
> this is OK:
> create table test ( "user_hive" String);
> any idea?