EXPLAIN¶
The EXPLAIN command shows the logical and physical execution plan for the specified SQL statement.
EXPLAIN [ANALYZE] [VERBOSE] statement
EXPLAIN¶
Shows the execution plan of a statement.
If you need more detailed output, 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: file_groups={1 group: [[/tmp/table.csv]]}, projection=[x, b], has_header=false |
| | |
+---------------+----------------------------------------------------------------------------------------------------------------------------------------------------------------+
EXPLAIN ANALYZE¶
Shows the execution plan and metrics of a statement.
If you need more information output, 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: file_groups={1 group: [[/tmp/table.csv]]}, has_header=false, metrics=[] |
+-------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------+