Как найти фактические имена столбцов для _col0, _col17, _col18 для данного запроса?Как узнать, какие фактические столбцы соответствуют следующим:.
QUERY SQL Hive:
объяснить подробный выбор w_warehouse_sk, i_item_id со склада w, элемент i, где i.i_item_sk = w.w_warehouse_sk
| Plan not optimized by CBO.|
||
| Vertex dependency in root stage|
| Map 1 <- Map 2 (BROADCAST_EDGE)|
||
| Stage-0|
| Fetch Operator|
| limit:-1|
| Stage-1|
| Map 1 vectorized|
| File Output Operator [FS_112887]|
| compressed:false|
| Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| table:{"input format:":"org.apache.hadoop.mapred.TextInputFormat","output format:":"org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat","serde:":"org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe"} |
| Select Operator [OP_112886]|
| outputColumnNames:["_col0","_col1"]|
| Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| Filter Operator [FIL_112885]|
| predicate:(_col17 = _col0) (type: boolean)|
| Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| Map Join Operator [MAPJOIN_112884]|
| | condition map:[{"":"Inner Join 0 to 1"}]|
| | HybridGraceHashJoin:true|
| | keys:{"Map 2":"i_item_sk (type: int)","Map 1":"w_warehouse_sk (type: int)"}|
| | outputColumnNames:["_col0","_col17","_col18"]|
| | Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| |<-Map 2 [BROADCAST_EDGE] vectorized|
| | Reduce Output Operator [RS_112882]|
| | key expressions:i_item_sk (type: int)|
| | Map-reduce partition columns:i_item_sk (type: int)|
| | sort order:+|
| | Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| | value expressions:i_item_id (type: string)|
| | Filter Operator [FIL_112881]|
| | predicate:i_item_sk is not null (type: boolean)|
| | Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| | TableScan [TS_112865]|
| | alias:i|
| | Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| |<-Filter Operator [FIL_112883]|
| predicate:w_warehouse_sk is not null (type: boolean)|
| Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE|
| TableScan [TS_112864]|
| alias:w|
| Statistics:Num rows: 1 Data size: 0 Basic stats: PARTIAL Column stats: NONE |
Заранее спасибо!!