STORED AS
意味着三件事:
- SERDE
- INPUTFORMAT
- OUTPUTFORMAT
你只定义了最后2个,并将SERDE定义为hive.default.serde
hive.default.serde
默认值:org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
Hive 0.14与HIVE-5976一起添加
Hive用于存储格式未指定SerDe的默认SerDe。
当前未指定SerDe的存储格式包括'TextFile,RcFile'。
演示
hive.default.serde
set hive.default.serde;
hive.default.serde=org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
存储格式为ORC
create table mytable (i int)
stored as orc;
show create table mytable;
请注意,SERDE 是 'org.apache.hadoop.hive.ql.io.orc.OrcSerde'
CREATE TABLE `mytable`(
`i` int)
ROW FORMAT SERDE
'org.apache.hadoop.hive.ql.io.orc.OrcSerde'
STORED AS INPUTFORMAT
'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat'
LOCATION
'file:/home/cloudera/local_db/mytable'
TBLPROPERTIES (
'COLUMN_STATS_ACCURATE'='{\"BASIC_STATS\":\"true\"}',
'numFiles'='0',
'numRows'='0',
'rawDataSize'='0',
'totalSize'='0',
'transient_lastDdlTime'='1496982059')
存储格式为 INPUTFORMAT ... 输出格式为 OUTPUTFORMAT ...
create table mytable2 (i int)
STORED AS
INPUTFORMAT
'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat'
;
show create table mytable2
;
请注意,SERDE 是 'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
CREATE TABLE `mytable2`(
`i` int)
ROW FORMAT SERDE
'org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe'
STORED AS INPUTFORMAT
'org.apache.hadoop.hive.ql.io.orc.OrcInputFormat'
OUTPUTFORMAT
'org.apache.hadoop.hive.ql.io.orc.OrcOutputFormat'
LOCATION
'file:/home/cloudera/local_db/mytable2'
TBLPROPERTIES (
'COLUMN_STATS_ACCURATE'='{\"BASIC_STATS\":\"true\"}',
'numFiles'='0',
'numRows'='0',
'rawDataSize'='0',
'totalSize'='0',
'transient_lastDdlTime'='1496982426')