mirror of https://github.com/citusdata/citus.git
61 lines
2.1 KiB
Plaintext
61 lines
2.1 KiB
Plaintext
-- Testing a having clause that could have been a where clause between a distributed table
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-- and a reference table. This query was the cause for intermediate results not being
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-- available during the replace of the planner for the master query with the standard
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-- planner.
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-- Since the having clause could have been a where clause the having clause on the grouping
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-- on the coordinator is replaced with a Result node containing a One-time filter if the
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-- having qual (one-time filter works because the query doesn't change with the tuples
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-- returned from below).
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SELECT count(*),
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o_orderstatus
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FROM orders
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GROUP BY 2
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HAVING (
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SELECT count(*)
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FROM customer
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) > 0;
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count | o_orderstatus
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---------------------------------------------------------------------
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1461 | O
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75 | P
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1449 | F
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(3 rows)
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-- lets pin the plan in the test as well
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EXPLAIN (COSTS OFF)
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SELECT count(*),
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o_orderstatus
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FROM orders
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GROUP BY 2
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HAVING (
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SELECT count(*)
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FROM customer
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) > 0;
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QUERY PLAN
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---------------------------------------------------------------------
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HashAggregate
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Group Key: remote_scan.o_orderstatus
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InitPlan 1 (returns $0)
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-> Function Scan on read_intermediate_result intermediate_result
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-> Result
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One-Time Filter: ($0 > 0)
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-> Custom Scan (Citus Adaptive)
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Filter: ($0 > 0)
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-> Distributed Subplan XXX_1
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-> Custom Scan (Citus Adaptive)
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Task Count: 1
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Tasks Shown: All
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-> Task
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Node: host=localhost port=xxxxx dbname=regression
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-> Aggregate
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-> Seq Scan on customer_360005 customer
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Task Count: 2
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Tasks Shown: One of 2
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-> Task
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Node: host=localhost port=xxxxx dbname=regression
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-> HashAggregate
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Group Key: orders.o_orderstatus
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-> Seq Scan on orders_360002 orders
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(23 rows)
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