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From "Bhaskar, Snehalata" <Snehalata_Bhas...@Syntelinc.com>
Subject RE: Adding comment to a table for columns
Date Thu, 21 Feb 2013 11:21:30 GMT
Try using 'describe formatted' command  i.e.  describe formatted test

Thanks and regards,
Snehalata Deorukhkar

From: Chunky Gupta [mailto:chunky.gupta@vizury.com]
Sent: Thursday, February 21, 2013 4:47 PM
To: user@hive.apache.org
Subject: Adding comment to a table for columns


Hi,

I am using this syntax to add comments for all columns :-

CREATE EXTERNAL TABLE test ( c STRING COMMENT 'Common  class', time STRING COMMENT 'Common
 time', url STRING COMMENT 'Site URL' ) PARTITIONED BY (dt STRING ) LOCATION 's3://BucketName/'

Output of Describe Extended table is like :- (Output is just an example copied from internet)

hive> DESCRIBE EXTENDED table_name;

Detailed Table Information Table(tableName:table_name, dbName:benchmarking, owner:root, createTime:1309480053,
lastAccessTime:0, retention:0, sd:StorageDescriptor(cols:[FieldSchema(name:session_key, type:string,
comment:null), FieldSchema(name:remote_address, type:string, comment:null), FieldSchema(name:canister_lssn,
type:string, comment:null), FieldSchema(name:canister_session_id, type:bigint, comment:null),
FieldSchema(name:tltsid, type:string, comment:null), FieldSchema(name:tltuid, type:string,
comment:null), FieldSchema(name:tltvid, type:string, comment:null), FieldSchema(name:canister_server,
type:string, comment:null), FieldSchema(name:session_timestamp, type:string, comment:null),
FieldSchema(name:session_duration, type:string, comment:null), FieldSchema(name:hit_count,
type:bigint, comment:null), FieldSchema(name:http_user_agent, type:string, comment:null),
FieldSchema(name:extractid, type:bigint, comment:null), FieldSchema(name:site_link, type:string,
comment:null), FieldSchema(name:dt, type:string, comment:null), FieldSchema(name:hour, type:int,
comment:null)], location:hdfs://hadoop2/user/hive/warehouse/benchmarking.db/table_name, inputFormat:org.apache.hadoop.mapred.SequenceFileInputFormat,
outputFormat:org.apache.hadoop.hive.ql.io.HiveSequenceFileOutputFormat, compressed:false,
numBuckets:-1, serdeInfo:SerDeInfo(name:null, serializationLib:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe)

Is there any way of getting this detailed comments and column name in readable format, just
like the output of "Describe table_name" ?.



Thanks,

Chunky.

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