mirror of https://github.com/citusdata/citus.git
59 lines
2.2 KiB
SQL
59 lines
2.2 KiB
SQL
--
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-- MULTI_JOIN_PRUNING
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--
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-- Check that join-pruning works for joins between two relations. For now
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-- we only check for join-pruning between locally partitioned relations. In the
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-- future we want to check for pruning between re-partitioned relations as well.
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SET citus.explain_distributed_queries TO off;
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SET client_min_messages TO DEBUG2;
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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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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_orderkey = o_orderkey AND l_orderkey > 9030;
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-- Shards for the lineitem table have been pruned away. Check that join pruning
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-- works as expected in this case.
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_orderkey = o_orderkey AND l_orderkey > 20000;
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-- Partition pruning left three shards for the lineitem and one shard for the
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-- orders table. These shard sets don't overlap, so join pruning should prune
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-- out all the shards, and leave us with an empty task list.
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_orderkey = o_orderkey AND l_orderkey > 6000 AND o_orderkey < 6000;
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-- Make sure that we can handle filters without a column
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SELECT sum(l_linenumber), avg(l_linenumber) FROM lineitem, orders
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WHERE l_orderkey = o_orderkey AND false;
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SELECT sum(l_linenumber), avg(l_linenumber)
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FROM lineitem INNER JOIN orders ON (l_orderkey = o_orderkey)
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WHERE false;
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-- These tests check that we can do join pruning for tables partitioned over
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-- different type of columns including varchar, array types, composite types
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-- etc. This is in response to a bug we had where we were not able to resolve
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-- correct operator types for some kind of column types.
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EXPLAIN SELECT count(*)
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FROM array_partitioned_table table1, array_partitioned_table table2
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WHERE table1.array_column = table2.array_column;
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EXPLAIN SELECT count(*)
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FROM composite_partitioned_table table1, composite_partitioned_table table2
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WHERE table1.composite_column = table2.composite_column;
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-- Test that large table joins on partition varchar columns work
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EXPLAIN SELECT count(*)
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FROM varchar_partitioned_table table1, varchar_partitioned_table table2
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WHERE table1.varchar_column = table2.varchar_column;
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