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Hive, mail # user - HIVE-49 and other forms of CLI niceness


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RE: HIVE-49 and other forms of CLI niceness
Ashish Thusoo 2010-01-27, 21:55
Looks like a good suggestion. Ideally the driver code should just return a structure that encodes the columns separately as opposed to a single serialized string today and the formatting logic should all be in the CliDriver

Ashish

-----Original Message-----
From: Edward Capriolo [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, January 27, 2010 1:00 PM
To: [EMAIL PROTECTED]
Subject: HIVE-49 and other forms of CLI niceness

All,

Some simple features in Hive can really bring down the learning curve for new users. I am teaching some how to use hive.

A buddy if mine did this.
hive> select * from mt_date_test;
OK
a 2010-01-01 NULL
b 2009-12-31 NULL
c 2010-01-27 NULL

hive> select * from mt_date_test where my_date > '2010-01-01';

2010-01-27 08:18:27,008 map = 100%,  reduce =100% Ended Job = job_200909171715_20264 OK

I instantly suspected 1) whiteplace 2) delimeters

hive> select key from mt_date_test;

OK
a       2010-01-01
b       2009-12-31
c       2010-01-27

!!BINGO!!

Should we use a pipe | or some other column delimiter like the mysql CLI does? and have this be a property that is on by default

hive.cli.columnseparator='\t'
hive.cli.columnseparator='|'

In its current state the user understandably made the assumption that '>' does not work on strings.

Should we add some expose the format of the results in Driver so that the CLI can effectively split the rows by column?