mirror of https://github.com/citusdata/citus.git
84 lines
3.1 KiB
SQL
84 lines
3.1 KiB
SQL
--
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-- MULTI_NULL_MINMAX_VALUE_PRUNING
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--
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-- This test checks that we can handle null min/max values in shard statistics
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-- and that we don't partition or join prune shards that have null values.
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SET citus.next_shard_id TO 760000;
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-- print major version number for version-specific tests
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SHOW server_version \gset
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SELECT substring(:'server_version', '\d+')::int AS server_version;
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SET client_min_messages TO DEBUG2;
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SET citus.explain_all_tasks TO on;
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-- to avoid differing explain output - executor doesn't matter,
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-- because were testing pruning here.
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SET citus.task_executor_type TO 'real-time';
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-- Change configuration to treat lineitem and orders tables as large
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SET citus.large_table_shard_count TO 2;
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SET citus.log_multi_join_order to true;
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SET citus.enable_repartition_joins to ON;
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SELECT shardminvalue, shardmaxvalue from pg_dist_shard WHERE shardid = 290000;
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SELECT shardminvalue, shardmaxvalue from pg_dist_shard WHERE shardid = 290001;
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-- Check that partition and join pruning works when min/max values exist
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-- Adding l_orderkey = 1 to make the query not router executable
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EXPLAIN (COSTS FALSE)
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SELECT l_orderkey, l_linenumber, l_shipdate FROM lineitem WHERE l_orderkey = 9030 or l_orderkey = 1;
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EXPLAIN (COSTS FALSE)
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_orderkey = o_orderkey;
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-- Now set the minimum value for a shard to null. Then check that we don't apply
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-- partition or join pruning for the shard with null min value. Since it is not
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-- supported with single-repartition join, dual-repartition has been used.
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UPDATE pg_dist_shard SET shardminvalue = NULL WHERE shardid = 290000;
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EXPLAIN (COSTS FALSE)
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SELECT l_orderkey, l_linenumber, l_shipdate FROM lineitem WHERE l_orderkey = 9030;
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EXPLAIN (COSTS FALSE)
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_partkey = o_custkey;
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-- Next, set the maximum value for another shard to null. Then check that we
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-- don't apply partition or join pruning for this other shard either. Since it
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-- is not supported with single-repartition join, dual-repartition has been used.
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UPDATE pg_dist_shard SET shardmaxvalue = NULL WHERE shardid = 290001;
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EXPLAIN (COSTS FALSE)
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SELECT l_orderkey, l_linenumber, l_shipdate FROM lineitem WHERE l_orderkey = 9030;
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EXPLAIN (COSTS FALSE)
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_partkey = o_custkey;
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-- Last, set the minimum value to 0 and check that we don't treat it as null. We
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-- should apply partition and join pruning for this shard now. Since it is not
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-- supported with single-repartition join, dual-repartition has been used.
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UPDATE pg_dist_shard SET shardminvalue = '0' WHERE shardid = 290000;
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EXPLAIN (COSTS FALSE)
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SELECT l_orderkey, l_linenumber, l_shipdate FROM lineitem WHERE l_orderkey = 9030;
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EXPLAIN (COSTS FALSE)
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_partkey = o_custkey;
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-- Set minimum and maximum values for two shards back to their original values
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UPDATE pg_dist_shard SET shardminvalue = '1' WHERE shardid = 290000;
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UPDATE pg_dist_shard SET shardmaxvalue = '14947' WHERE shardid = 290001;
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SET client_min_messages TO NOTICE;
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