mirror of https://github.com/citusdata/citus.git
40 lines
1.3 KiB
SQL
40 lines
1.3 KiB
SQL
--
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-- columnar_fallback_scan.sql
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--
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-- Test columnar.enable_custom_scan = false, which will use an
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-- ordinary sequential scan. It won't benefit from projection pushdown
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-- or qual pushdown, but it should return the correct results.
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--
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set columnar.enable_custom_scan = false;
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create table fallback_scan(i int) using columnar;
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-- large enough to test parallel_workers > 1
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select alter_columnar_table_set('fallback_scan', compression => 'none');
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insert into fallback_scan select generate_series(1,150000);
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vacuum analyze fallback_scan;
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select count(*), min(i), max(i), avg(i) from fallback_scan;
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--
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-- Negative test: try to force a parallel plan with at least two
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-- workers, but columnar should reject it and use a non-parallel scan.
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--
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set force_parallel_mode = regress;
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set min_parallel_table_scan_size = 1;
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set parallel_tuple_cost = 0;
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set max_parallel_workers = 4;
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set max_parallel_workers_per_gather = 4;
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explain (costs off) select count(*), min(i), max(i), avg(i) from fallback_scan;
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select count(*), min(i), max(i), avg(i) from fallback_scan;
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set force_parallel_mode to default;
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set min_parallel_table_scan_size to default;
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set parallel_tuple_cost to default;
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set max_parallel_workers to default;
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set max_parallel_workers_per_gather to default;
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set columnar.enable_custom_scan to default;
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drop table fallback_scan;
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