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33 lines
1.7 KiB
SQL
33 lines
1.7 KiB
SQL
DROP TABLE IF EXISTS tab;
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CREATE TABLE tab(e8 Enum8('hello' = -5, 'world' = 15), e16 Enum16('shark' = -999, 'eagle' = 9999)) ENGINE MergeTree ORDER BY tuple();
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INSERT INTO TABLE tab VALUES ('hello', 'shark'), ('world', 'eagle');
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SELECT '-- Positive offsets (slice from left)';
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WITH cte AS (SELECT number + 1 AS n FROM system.numbers LIMIT 6),
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permutations AS (SELECT c1.n AS offset, c2.n AS length FROM cte AS c1 CROSS JOIN cte AS c2)
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SELECT 'Offset: ', p.offset, 'Length: ', p.length,
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substring(e8, p.offset) AS s1, substring(e16, p.offset) AS s2,
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substring(e8, p.offset, p.length) AS s3, substring(e16, p.offset, p.length) AS s4
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FROM tab LEFT JOIN permutations AS p ON true;
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SELECT '-- Negative offsets (slice from right)';
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WITH cte AS (SELECT number + 1 AS n FROM system.numbers LIMIT 6),
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permutations AS (SELECT -c1.n AS offset, c2.n AS length FROM cte AS c1 CROSS JOIN cte AS c2)
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SELECT 'Offset: ', p.offset, 'Length: ', p.length,
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substring(e8, p.offset) AS s1, substring(e16, p.offset) AS s2,
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substring(e8, p.offset, p.length) AS s3, substring(e16, p.offset, p.length) AS s4
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FROM tab LEFT JOIN permutations AS p ON true;
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SELECT '-- Zero offset/length';
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WITH cte AS (SELECT number AS n FROM system.numbers LIMIT 2),
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permutations AS (SELECT c1.n AS offset, c2.n AS length FROM cte AS c1 CROSS JOIN cte AS c2 LIMIT 3)
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SELECT 'Offset: ', p.offset, 'Length: ', p.length,
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substring(e8, p.offset) AS s1, substring(e16, p.offset) AS s2,
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substring(e8, p.offset, p.length) AS s3, substring(e16, p.offset, p.length) AS s4
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FROM tab LEFT JOIN permutations AS p ON true;
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SELECT '-- Constant enums';
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SELECT substring(CAST('foo', 'Enum8(\'foo\' = 1)'), 1, 1), substring(CAST('foo', 'Enum16(\'foo\' = 1111)'), 1, 2);
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DROP TABLE tab;
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