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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)