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35 lines
1.4 KiB
SQL
35 lines
1.4 KiB
SQL
DROP TABLE IF EXISTS t_sparse_pk;
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DROP TABLE IF EXISTS t_full_pk;
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CREATE TABLE t_sparse_pk (k UInt64, s String)
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ENGINE = MergeTree ORDER BY k
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SETTINGS ratio_of_defaults_for_sparse_serialization = 0.0, index_granularity = 1;
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INSERT INTO t_sparse_pk VALUES (0, 'a'), (0, 'b'), (1, ''), (2, ''), (2, 'e'), (3, 'f'), (4, 'g');
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SET force_primary_key = 1;
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SELECT k, s FROM t_sparse_pk WHERE k = 2 ORDER BY k, s;
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SELECT k, s FROM t_sparse_pk WHERE k = 0 OR k = 3 ORDER BY k, s;
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DROP TABLE IF EXISTS t_sparse_pk;
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CREATE TABLE t_sparse_pk (k UInt64, v UInt64 CODEC(NONE))
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ENGINE = MergeTree ORDER BY k
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SETTINGS ratio_of_defaults_for_sparse_serialization = 0.0, index_granularity = 30;
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CREATE TABLE t_full_pk (k UInt64, v UInt64)
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ENGINE = MergeTree ORDER BY k
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SETTINGS ratio_of_defaults_for_sparse_serialization = 1.1, index_granularity = 30;
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INSERT INTO t_sparse_pk SELECT number % 10, number % 4 = 0 FROM numbers(1000);
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INSERT INTO t_full_pk SELECT number % 10, number % 4 = 0 FROM numbers(1000);
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INSERT INTO t_sparse_pk SELECT number % 10, number % 6 = 0 FROM numbers(1000);
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INSERT INTO t_full_pk SELECT number % 10, number % 6 = 0 FROM numbers(1000);
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SELECT count(v), sum(v) FROM t_sparse_pk WHERE k = 0;
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SELECT count(v), sum(v) FROM t_full_pk WHERE k = 0;
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SELECT count(v), sum(v) FROM t_sparse_pk WHERE k = 0 OR k = 3 OR k = 7 OR k = 8;
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SELECT count(v), sum(v) FROM t_full_pk WHERE k = 0 OR k = 3 OR k = 7 OR k = 8; |