详细查询计划

可使用 VERBOSE 选项对 EXPLAIN 进行限定。此选项对默认和 JSON 输出有效，可增加所呈现的查询计划的详细信息量

例如，以下 EXPLAIN 语句指定生成详细输出。添加的信息将以粗体显示：

=> EXPLAIN VERBOSE SELECT customer_name, customer_state FROM customer_dimension
     WHERE customer_state IN ('MA','NH') AND customer_gender='Male' ORDER BY customer_name LIMIT 10;

QUERY PLAN DESCRIPTION:
 ------------------------------

 Opt Vertica Options
 --------------------
 PLAN_OUTPUT_SUPER_VERBOSE

 EXPLAIN VERBOSE SELECT customer_name, customer_state FROM customer_dimension
 WHERE customer_state IN ('MA','NH') AND customer_gender='Male'
 ORDER BY customer_name LIMIT 10;

Access Path:
+-SELECT  LIMIT 10 [Cost: 756.000000, Rows: 10.000000 Disk(B): 0.000000 CPU(B): 0.000000 Memory(B): 0.000000 Netwrk(B): 0.000000 Parallelism: 1.000000] [OutRowSz (B): 274](PATH ID: 0)
|  Output Only: 10 tuples
|  Execute on: Query Initiator
|  Sort Key: (customer_dimension.customer_name)
|  LDISTRIB_UNSEGMENTED
| +---> SORT [TOPK] [Cost: 756.000000, Rows: 9998.000000 Disk(B): 0.000000 CPU(B): 34274697.123457 Memory(B): 2739452.000000 Netwrk(B): 0.000000 Parallelism: 4.000000 (NO STATISTICS)] [OutRowSz (B): 274] (PATH ID: 1)
| |      Order: customer_dimension.customer_name ASC
| |      Output Only: 10 tuples
| |      Execute on: Query Initiator
| |      Sort Key: (customer_dimension.customer_name)
| |      LDISTRIB_UNSEGMENTED
| | +---> STORAGE ACCESS for customer_dimension [Cost: 513.000000, Rows: 9998.000000 Disk(B): 0.000000 CPU(B): 0.000000 Memory(B): 0.000000 Netwrk(B): 0.000000 Parallelism: 4.000000 (NO STATISTICS)] [OutRowSz (B): 274] (PATH ID: 2)
| | |      Column Cost Aspects: [ Disk(B): 7371817.156569 CPU(B): 4914708.578284 Memory(B): 2659466.004399 Netwrk(B): 0.000000 Parallelism: 4.000000 ]
| | |      Projection: public.customer_dimension_P1
| | |      Materialize: customer_dimension.customer_state, customer_dimension.customer_name
| | |      Filter: (customer_dimension.customer_gender = 'Male')/* sel=0.999800 ndv= 500 */
| | |      Filter: (customer_dimension.customer_state = ANY (ARRAY['MA', 'NH']))/* sel=0.999800 ndv= 500 */
| | |      Execute on: All Nodes
| | |      Runtime Filter: (SIP1(TopK): customer_dimension.customer_name)
| | |      Sort Key: (customer_dimension.household_id, customer_dimension.customer_key, customer_dimension.store_membership_card, customer_dimension.customer_type, customer_dimension.customer_region, customer_dimension.title, customer_dimension.number_of_children)
| | |      LDISTRIB_SEGMENTED