What is the use of compressed field in the hive storage descriptor

[KayVajj]

A desc extended command results in the following

Table(
tableName:table_namet,
dbName:cybs_test,
owner:x...@abc.com,
createTime:1380232668,
lastAccessTime:0,
retention:0,
sd:StorageDescriptor(
  cols:[
    FieldSchema(name:a, type:string, comment:null),
FieldSchema(name:b, type:string, comment:null),
FieldSchema(name:c, type:string, comment:null),
FieldSchema(name:d, type:string, comment:null),
FieldSchema(name:e, type:string, comment:null),
FieldSchema(name:f, type:timestamp, comment:null),
FieldSchema(name:date_added, type:timestamp, comment:null),
FieldSchema(name:g, type:string, comment:null),
FieldSchema(name:h, type:string, comment:null),
FieldSchema(name:i, type:string, comment:null),
FieldSchema(name:j, type:string, comment:null)
],
location:xyz
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,
  parameters:{colelction.delim=, mapkey.delim=, serialization.format=,
field.delim=}
),
bucketCols:[],
sortCols:[],
parameters:{},
skewedInfo:SkewedInfo(skewedColNames:[], skewedColValues:[],
skewedColValueLocationMaps:{}),
storedAsSubDirectories:false
),
partitionKeys:[FieldSchema(name:dt, type:int, comment:null)],
parameters:{numPartitions=1, numFiles=5, EXTERNAL=TRUE,
transient_lastDdlTime=1380233065, totalSize=340426, numRows=0,
comment=Request Table from ODS, rawDataSize=0},
viewOriginalText:null,
viewExpandedText:null,
tableType:EXTERNAL_TABLE
)

What is the meaning of the highlighted field?

Thanks