EXPLAIN

The EXPLAIN command shows the logical and physical execution plan for the specified SQL statement.

EXPLAIN

Shows the execution plan of a statement. If you need more details output, try to use EXPLAIN VERBOSE.

EXPLAIN SELECT SUM(x) FROM table GROUP BY b;
+---------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| plan_type     | plan                                                                                                                                                           |
+---------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+
| logical_plan  | Projection: #SUM(table.x)                                                                                                                                        |
|               |   Aggregate: groupBy=[[#table.b]], aggr=[[SUM(#table.x)]]                                                                                                          |
|               |     TableScan: table projection=[x, b]                                                                                                                           |
| physical_plan | ProjectionExec: expr=[SUM(table.x)@1 as SUM(table.x)]                                                                                                              |
|               |   AggregateExec: mode=FinalPartitioned, gby=[b@0 as b], aggr=[SUM(table.x)]                                                                                      |
|               |     CoalesceBatchesExec: target_batch_size=4096                                                                                                                |
|               |       RepartitionExec: partitioning=Hash([Column { name: "b", index: 0 }], 16)                                                                                 |
|               |         AggregateExec: mode=Partial, gby=[b@1 as b], aggr=[SUM(table.x)]                                                                                         |
|               |           RepartitionExec: partitioning=RoundRobinBatch(16)                                                                                                    |
|               |             CsvExec: source=Path(/tmp/table.csv: [/tmp/table.csv]), has_header=false, limit=None, projection=[x, b]                                            |
|               |                                                                                                                                                                |
+---------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+

EXPLAIN ANALYZE

Shows the execution plan and metrics of a statement. If you need more information output, try to use EXPLAIN ANALYZE VERBOSE.

EXPLAIN ANALYZE SELECT SUM(x) FROM table GROUP BY b;
+-------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+
| plan_type         | plan                                                                                                                                                      |
+-------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+
| Plan with Metrics | CoalescePartitionsExec, metrics=[]                                                                                                                        |
|                   |   ProjectionExec: expr=[SUM(table.x)@1 as SUM(x)], metrics=[]                                                                                             |
|                   |     HashAggregateExec: mode=FinalPartitioned, gby=[b@0 as b], aggr=[SUM(x)], metrics=[outputRows=2]                                                       |
|                   |       CoalesceBatchesExec: target_batch_size=4096, metrics=[]                                                                                             |
|                   |         RepartitionExec: partitioning=Hash([Column { name: "b", index: 0 }], 16), metrics=[sendTime=839560, fetchTime=122528525, repartitionTime=5327877] |
|                   |           HashAggregateExec: mode=Partial, gby=[b@1 as b], aggr=[SUM(x)], metrics=[outputRows=2]                                                          |
|                   |             RepartitionExec: partitioning=RoundRobinBatch(16), metrics=[fetchTime=5660489, repartitionTime=0, sendTime=8012]                              |
|                   |               CsvExec: source=Path(/tmp/table.csv: [/tmp/table.csv]), has_header=false, metrics=[]                                                        |
+-------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+