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--
-- MULTI_EXPLAIN
--
\a\t
SET citus.explain_distributed_queries TO on;
-- Test Text format
EXPLAIN (COSTS FALSE, FORMAT TEXT)
SELECT l_quantity, count(*) count_quantity FROM lineitem
GROUP BY l_quantity ORDER BY count_quantity, l_quantity;
Distributed Query into pg_merge_job_0040
Executor: Real-Time
Task Count: 6
Tasks Shown: One of 6
-> Task
Node: host=localhost port=57637 dbname=regression
-> HashAggregate
Group Key: l_quantity
-> Seq Scan on lineitem_102010 lineitem
Master Query
-> Sort
Sort Key: (sum(((sum(intermediate_column_40_1))::bigint)))::bigint, intermediate_column_40_0
-> HashAggregate
Group Key: intermediate_column_40_0
-> Seq Scan on pg_merge_job_0040
-- Test JSON format
EXPLAIN (COSTS FALSE, FORMAT JSON)
SELECT l_quantity, count(*) count_quantity FROM lineitem
GROUP BY l_quantity ORDER BY count_quantity, l_quantity;
[
"Executor": "Real-Time",
{
"Task Count": 6,
"Tasks Shown": "One of 6",
"Tasks": [
{
"Node": "host=localhost port=57637 dbname=regression",
"Remote Plan": [
[
{
"Plan": {
"Node Type": "Aggregate",
"Strategy": "Hashed",
"Group Key": ["l_quantity"],
"Plans": [
{
"Node Type": "Seq Scan",
"Parent Relationship": "Outer",
"Relation Name": "lineitem_102010",
"Alias": "lineitem"
}
]
}
}
]
]
}
]
},
{
"Plan": {
"Node Type": "Sort",
"Sort Key": ["(sum(((sum(intermediate_column_41_1))::bigint)))::bigint", "intermediate_column_41_0"],
"Plans": [
{
"Node Type": "Aggregate",
"Strategy": "Hashed",
"Parent Relationship": "Outer",
"Group Key": ["intermediate_column_41_0"],
"Plans": [
{
"Node Type": "Seq Scan",
"Parent Relationship": "Outer",
"Relation Name": "pg_merge_job_0041",
"Alias": "pg_merge_job_0041"
}
]
}
]
}
}
]
-- Test XML format
EXPLAIN (COSTS FALSE, FORMAT XML)
SELECT l_quantity, count(*) count_quantity FROM lineitem
GROUP BY l_quantity ORDER BY count_quantity, l_quantity;
<explain xmlns="http://www.postgresql.org/2009/explain">
<Executor>Real-Time</Executor>
<Job>
<Task-Count>6</Task-Count>
<Tasks-Shown>One of 6</Tasks-Shown>
<Tasks>
<Task>
<Node>host=localhost port=57637 dbname=regression</Node>
<Remote-Plan>
<explain xmlns="http://www.postgresql.org/2009/explain">
<Query>
<Plan>
<Node-Type>Aggregate</Node-Type>
<Strategy>Hashed</Strategy>
<Group-Key>
<Item>l_quantity</Item>
</Group-Key>
<Plans>
<Plan>
<Node-Type>Seq Scan</Node-Type>
<Parent-Relationship>Outer</Parent-Relationship>
<Relation-Name>lineitem_102010</Relation-Name>
<Alias>lineitem</Alias>
</Plan>
</Plans>
</Plan>
</Query>
</explain>
</Remote-Plan>
</Task>
</Tasks>
</Job>
<Query>
<Plan>
<Node-Type>Sort</Node-Type>
<Sort-Key>
<Item>(sum(((sum(intermediate_column_42_1))::bigint)))::bigint</Item>
<Item>intermediate_column_42_0</Item>
</Sort-Key>
<Plans>
<Plan>
<Node-Type>Aggregate</Node-Type>
<Strategy>Hashed</Strategy>
<Parent-Relationship>Outer</Parent-Relationship>
<Group-Key>
<Item>intermediate_column_42_0</Item>
</Group-Key>
<Plans>
<Plan>
<Node-Type>Seq Scan</Node-Type>
<Parent-Relationship>Outer</Parent-Relationship>
<Relation-Name>pg_merge_job_0042</Relation-Name>
<Alias>pg_merge_job_0042</Alias>
</Plan>
</Plans>
</Plan>
</Plans>
</Plan>
</Query>
</explain>
-- Test YAML format
EXPLAIN (COSTS FALSE, FORMAT YAML)
SELECT l_quantity, count(*) count_quantity FROM lineitem
GROUP BY l_quantity ORDER BY count_quantity, l_quantity;
Executor: "Real-Time"
- Task Count: 6
Tasks Shown: "One of 6"
Tasks:
- Node: "host=localhost port=57637 dbname=regression"
Remote Plan:
- Plan:
Node Type: "Aggregate"
Strategy: "Hashed"
Group Key:
- "l_quantity"
Plans:
- Node Type: "Seq Scan"
Parent Relationship: "Outer"
Relation Name: "lineitem_102010"
Alias: "lineitem"
- Plan:
Node Type: "Sort"
Sort Key:
- "(sum(((sum(intermediate_column_43_1))::bigint)))::bigint"
- "intermediate_column_43_0"
Plans:
- Node Type: "Aggregate"
Strategy: "Hashed"
Parent Relationship: "Outer"
Group Key:
- "intermediate_column_43_0"
Plans:
- Node Type: "Seq Scan"
Parent Relationship: "Outer"
Relation Name: "pg_merge_job_0043"
Alias: "pg_merge_job_0043"
-- Test Text format
EXPLAIN (COSTS FALSE, FORMAT TEXT)
SELECT l_quantity, count(*) count_quantity FROM lineitem
GROUP BY l_quantity ORDER BY count_quantity, l_quantity;
Distributed Query into pg_merge_job_0044
Executor: Real-Time
Task Count: 6
Tasks Shown: One of 6
-> Task
Node: host=localhost port=57637 dbname=regression
-> HashAggregate
Group Key: l_quantity
-> Seq Scan on lineitem_102010 lineitem
Master Query
-> Sort
Sort Key: (sum(((sum(intermediate_column_44_1))::bigint)))::bigint, intermediate_column_44_0
-> HashAggregate
Group Key: intermediate_column_44_0
-> Seq Scan on pg_merge_job_0044
-- Test verbose
EXPLAIN (COSTS FALSE, VERBOSE TRUE)
SELECT sum(l_quantity) / avg(l_quantity) FROM lineitem;
Distributed Query into pg_merge_job_0045
Executor: Real-Time
Task Count: 6
Tasks Shown: One of 6
-> Task
Node: host=localhost port=57637 dbname=regression
-> Aggregate
Output: sum(l_quantity), sum(l_quantity), count(l_quantity)
-> Seq Scan on public.lineitem_102010 lineitem
Output: l_orderkey, l_partkey, l_suppkey, l_linenumber, l_quantity, l_extendedprice, l_discount, l_tax, l_returnflag, l_linestatus, l_shipdate, l_commitdate, l_receiptdate, l_shipinstruct, l_shipmode, l_comment
Master Query
-> Aggregate
Output: (sum(intermediate_column_45_0) / (sum(intermediate_column_45_1) / sum(intermediate_column_45_2)))
-> Seq Scan on pg_temp_2.pg_merge_job_0045
Output: intermediate_column_45_0, intermediate_column_45_1, intermediate_column_45_2
-- Test join
EXPLAIN (COSTS FALSE)
SELECT * FROM lineitem
JOIN orders ON l_orderkey = o_orderkey AND l_quantity < 5
ORDER BY l_quantity DESC LIMIT 10;
Distributed Query into pg_merge_job_0046
Executor: Real-Time
Task Count: 6
Tasks Shown: One of 6
-> Task
Node: host=localhost port=57637 dbname=regression
-> Limit
-> Sort
Sort Key: lineitem.l_quantity
-> Hash Join
Hash Cond: (lineitem.l_orderkey = orders.o_orderkey)
-> Seq Scan on lineitem_102010 lineitem
Filter: (l_quantity < 5::numeric)
-> Hash
-> Seq Scan on orders_102015 orders
Master Query
-> Limit
-> Sort
Sort Key: intermediate_column_46_4
-> Seq Scan on pg_merge_job_0046
-- Test insert
EXPLAIN (COSTS FALSE)
INSERT INTO lineitem VALUES(1,0);
Distributed Query
Executor: Router
Task Count: 1
Tasks Shown: All
-> Task
Node: host=localhost port=57638 dbname=regression
-> Insert on lineitem_102009
-> Result
-- Test update
EXPLAIN (COSTS FALSE)
UPDATE lineitem
SET l_suppkey = 12
WHERE l_orderkey = 1 AND l_partkey = 0;
Distributed Query
Executor: Router
Task Count: 1
Tasks Shown: All
-> Task
Node: host=localhost port=57638 dbname=regression
-> Update on lineitem_102009
-> Bitmap Heap Scan on lineitem_102009
Recheck Cond: (l_orderkey = 1)
Filter: (l_partkey = 0)
-> Bitmap Index Scan on lineitem_pkey_102009
Index Cond: (l_orderkey = 1)
-- Test delete
EXPLAIN (COSTS FALSE)
DELETE FROM lineitem
WHERE l_orderkey = 1 AND l_partkey = 0;
Distributed Query
Executor: Router
Task Count: 1
Tasks Shown: All
-> Task
Node: host=localhost port=57638 dbname=regression
-> Delete on lineitem_102009
-> Bitmap Heap Scan on lineitem_102009
Recheck Cond: (l_orderkey = 1)
Filter: (l_partkey = 0)
-> Bitmap Index Scan on lineitem_pkey_102009
Index Cond: (l_orderkey = 1)
-- Test single-shard SELECT
EXPLAIN
SELECT l_quantity FROM lineitem WHERE l_orderkey = 5;
Distributed Query into pg_merge_job_0047
Executor: Router
Task Count: 1
Tasks Shown: All
-> Task
Node: host=localhost port=57637 dbname=regression
-> Bitmap Heap Scan on lineitem_102009 lineitem (cost=4.31..19.58 rows=5 width=18)
Recheck Cond: (l_orderkey = 5)
-> Bitmap Index Scan on lineitem_pkey_102009 (cost=0.00..4.31 rows=5 width=0)
Index Cond: (l_orderkey = 5)
-- Test CREATE TABLE ... AS
EXPLAIN CREATE TABLE explain_result AS
SELECT * FROM lineitem;
Distributed Query into pg_merge_job_0048
Executor: Real-Time
Task Count: 6
Tasks Shown: One of 6
-> Task
Node: host=localhost port=57637 dbname=regression
-> Seq Scan on lineitem_102010 lineitem (cost=0.00..58.80 rows=980 width=374)
Master Query
-> Seq Scan on pg_merge_job_0048 (cost=0.00..0.00 rows=0 width=0)
-- Test all tasks output
SET citus.explain_all_tasks TO on;
EXPLAIN (COSTS FALSE)
SELECT avg(l_linenumber) FROM lineitem WHERE l_orderkey > 9030;
Distributed Query into pg_merge_job_0049
Executor: Real-Time
Task Count: 3
Tasks Shown: All
-> Task
Node: host=localhost port=57637 dbname=regression
-> Aggregate
-> Seq Scan on lineitem_102012 lineitem
Filter: (l_orderkey > 9030)
-> Task
Node: host=localhost port=57638 dbname=regression
-> Aggregate
-> Seq Scan on lineitem_102013 lineitem
Filter: (l_orderkey > 9030)
-> Task
Node: host=localhost port=57637 dbname=regression
-> Aggregate
-> Seq Scan on lineitem_102014 lineitem
Filter: (l_orderkey > 9030)
Master Query
-> Aggregate
-> Seq Scan on pg_merge_job_0049
-- Test track tracker
SET citus.task_executor_type TO 'task-tracker';
SET citus.explain_all_tasks TO off;
EXPLAIN (COSTS FALSE)
SELECT avg(l_linenumber) FROM lineitem WHERE l_orderkey > 9030;
Distributed Query into pg_merge_job_0050
Executor: Task-Tracker
Task Count: 3
Tasks Shown: One of 3
-> Task
Node: host=localhost port=57637 dbname=regression
-> Aggregate
-> Seq Scan on lineitem_102012 lineitem
Filter: (l_orderkey > 9030)
Master Query
-> Aggregate
-> Seq Scan on pg_merge_job_0050
-- Test re-partition join
SET citus.large_table_shard_count TO 1;
EXPLAIN (COSTS FALSE)
SELECT count(*)
FROM lineitem, orders, customer, supplier
WHERE l_orderkey = o_orderkey
AND o_custkey = c_custkey
AND l_suppkey = s_suppkey;
Distributed Query into pg_merge_job_0053
Executor: Task-Tracker
Task Count: 1
Tasks Shown: None, not supported for re-partition queries
-> MapMergeJob
Map Task Count: 1
Merge Task Count: 1
-> MapMergeJob
Map Task Count: 6
Merge Task Count: 1
Master Query
-> Aggregate
-> Seq Scan on pg_merge_job_0053
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