-Re:Re: update a hive table
Richard 2012-03-19, 02:30
I see, thanks.
At 2012-03-16 20:30:24,"Bejoy Ks" <[EMAIL PROTECTED]> wrote:
Sorry I missed answering your question
>If mytable has many columns but I only need to update one of them, how can I write the
It is not possible in hive. At a bare minimum hive would overwrite a partition (not even a record/file) if you frame an optimized query.
Hope it helps!...
From: Bejoy Ks <[EMAIL PROTECTED]>
To: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
Sent: Friday, March 16, 2012 5:56 PM
Subject: Re: update a hive table
First, don't treat hive as a database. Hive is just an interface above map reduce that help you write SQL like queries that inturn is converted to MR jobs. Saying that hive doesn't support update.
If you are just experimenting, the query that you wrote would overwrite a whole record (in a broader context a whole partion/table)
From: Richard <[EMAIL PROTECTED]>
Sent: Friday, March 16, 2012 4:26 PM
Subject: update a hive table
if I wang to update a table, e.g,
insert overwrite table mytable
select lower(col1), col2, col3 from mytable;
if mytable has many columns but I only need to update one of them, how can I write the