44 lines
913 B
Plaintext
44 lines
913 B
Plaintext
# name: test/sql/sample/sample_verification.test_slow
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# description: Test SAMPLE keyword
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# group: [sample]
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statement ok
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PRAGMA enable_verification;
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# verify that it is a sample without replacement (i.e. the same row will never occur more than once in the result)
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loop i 0 10
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query I
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select count(distinct i) from range(10) tbl(i) using sample 5;
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----
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5
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endloop
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# specifying a seed leads to repeatable behavior
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loop i 0 10
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query I nosort reservoirseed
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select * from range(100) using sample 10 (reservoir, 250)
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----
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query I nosort bernoulliseed
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select * from range(100) using sample 10% (bernoulli, 250)
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----
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query I nosort systemseed
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select * from range(100) using sample 10% (system, 250)
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----
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endloop
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# specify as sample_size, with reservoir sampling this should give us an exact count (i.e. always 10)
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loop i 0 10
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query I
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select count(*) from range(100) using sample 10% (reservoir)
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----
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10
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endloop
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