| set hive.stats.fetch.column.stats=true; |
| |
| create table if not exists loc_staging_n5 ( |
| state string, |
| locid int, |
| zip bigint, |
| year int |
| ) row format delimited fields terminated by '|' stored as textfile; |
| |
| create table loc_orc_n5 like loc_staging_n5; |
| alter table loc_orc_n5 set fileformat orc; |
| |
| load data local inpath '../../data/files/loc.txt' overwrite into table loc_staging_n5; |
| |
| insert overwrite table loc_orc_n5 select * from loc_staging_n5; |
| |
| analyze table loc_orc_n5 compute statistics for columns state, locid, zip, year; |
| |
| -- numRows: 8 rawDataSize: 796 |
| explain select * from loc_orc_n5; |
| |
| -- numRows: 4 rawDataSize: 396 |
| explain select * from loc_orc_n5 limit 4; |
| |
| -- greater than the available number of rows |
| -- numRows: 8 rawDataSize: 796 |
| explain select * from loc_orc_n5 limit 16; |
| |
| -- numRows: 0 rawDataSize: 0 |
| explain select * from loc_orc_n5 limit 0; |
