Takahiko Saito created HIVE-13851:
-------------------------------------
Summary: Change columns of textfile formatted table from float to
double will drop some fractional digits
Key: HIVE-13851
URL: https://issues.apache.org/jira/browse/HIVE-13851
Project: Hive
Issue Type: Bug
Affects Versions: 1.2.1
Reporter: Takahiko Saito
In a case of texfile formatted table, changing a column from float to double
will drop some fractional digits:
{noformat}
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> create table test(f float);
No rows affected (0.176 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> insert into table test
values(-35664.76171875),(29497.349609375);
INFO : Tez session hasn't been created yet. Opening session
INFO : Dag name: insert into table tes...5),(29497.349609375)(Stage-1)
INFO :
INFO : Status: Running (Executing on YARN cluster with App id
application_1464135801747_0400)
INFO : Map 1: -/-
INFO : Map 1: 0/1
INFO : Map 1: 0/1
INFO : Map 1: 0(+1)/1
INFO : Map 1: 0(+1)/1
INFO : Map 1: 1/1
INFO : Loading data to table default.test from
hdfs://os-r7-wbucju-hiveserver2-11-5.openstacklocal:8020/apps/hive/warehouse/test/.hive-staging_hive_2016-05-25_17-22-03_941_5459171987449455387-1/-ext-10000
INFO : Table default.test stats: [numFiles=1, numRows=2, totalSize=19,
rawDataSize=17]
No rows affected (18.443 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> select * from test;
+------------------+--+
| test.f |
+------------------+--+
| -35664.76171875 |
| 29497.349609375 |
+------------------+--+
2 rows selected (0.231 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> alter table test change column f
f double;
No rows affected (0.34 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> select * from test;
+------------+--+
| test.f |
+------------+--+
| -35664.76 |
| 29497.35 |
+------------+--+
2 rows selected (0.128 seconds)
{noformat}
The issue is not seen with orc table:
{noformat}
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> create table orc(f float) stored
as orc;
No rows affected (0.162 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> insert into table orc
values(-35664.76171875),(29497.349609375);
INFO : Session is already open
INFO : Dag name: insert into table orc...5),(29497.349609375)(Stage-1)
INFO :
INFO : Status: Running (Executing on YARN cluster with App id
application_1464135801747_0400)
INFO : Map 1: 0/1
INFO : Map 1: 0/1
INFO : Map 1: 0(+1)/1
INFO : Map 1: 0(+1)/1
INFO : Map 1: 1/1
INFO : Loading data to table default.orc from
hdfs://os-r7-wbucju-hiveserver2-11-5.openstacklocal:8020/apps/hive/warehouse/orc/.hive-staging_hive_2016-05-25_17-25-26_569_221649193772012279-1/-ext-10000
INFO : Table default.orc stats: [numFiles=1, numRows=2, totalSize=253,
rawDataSize=8]
No rows affected (7.87 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> select * from orc;
+------------------+--+
| orc.f |
+------------------+--+
| -35664.76171875 |
| 29497.349609375 |
+------------------+--+
2 rows selected (0.117 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> alter table orc change column f
f double;
No rows affected (0.85 seconds)
0: jdbc:hive2://os-r7-wbucju-hiveserver2-11-1> select * from orc;
+------------------+--+
| orc.f |
+------------------+--+
| -35664.76171875 |
| 29497.349609375 |
+------------------+--+
2 rows selected (0.168 seconds)
{noformat}
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