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41 lines
1.4 KiB
SQL
41 lines
1.4 KiB
SQL
DROP TABLE IF EXISTS null_subcolumns;
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SELECT 'Nullable';
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CREATE TABLE null_subcolumns (id UInt32, n Nullable(String)) ENGINE = MergeTree ORDER BY id;
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INSERT INTO null_subcolumns VALUES (1, 'foo') (2, NULL) (3, NULL) (4, 'abc');
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SELECT count() FROM null_subcolumns WHERE n.null;
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SELECT count() FROM null_subcolumns PREWHERE n.null;
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-- Check, that subcolumns will be available after restart.
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DETACH TABLE null_subcolumns;
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ATTACH TABLE null_subcolumns;
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SELECT count() FROM null_subcolumns WHERE n.null;
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SELECT count() FROM null_subcolumns PREWHERE n.null;
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DROP TABLE null_subcolumns;
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DROP TABLE IF EXISTS map_subcolumns;
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SELECT 'Map';
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CREATE TABLE map_subcolumns (id UInt32, m Map(String, UInt32)) ENGINE = MergeTree ORDER BY id;
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INSERT INTO map_subcolumns VALUES (1, map('a', 1, 'b', 2)) (2, map('a', 3, 'c', 4)), (3, map('b', 5, 'c', 6, 'd', 7));
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SELECT count() FROM map_subcolumns WHERE has(m.keys, 'a');
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SELECT count() FROM map_subcolumns PREWHERE has(m.keys, 'b');
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SELECT count() FROM map_subcolumns WHERE arrayMax(m.values) > 3;
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SELECT count() FROM map_subcolumns PREWHERE arrayMax(m.values) > 3;
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DETACH TABLE map_subcolumns;
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ATTACH TABLE map_subcolumns;
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SELECT count() FROM map_subcolumns WHERE has(m.keys, 'a');
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SELECT count() FROM map_subcolumns PREWHERE has(m.keys, 'b');
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SELECT id, m.size0 FROM map_subcolumns;
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SELECT count() FROM map_subcolumns WHERE m.size0 > 2;
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DROP TABLE map_subcolumns;
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