52 lines
1.5 KiB
SQL
52 lines
1.5 KiB
SQL
# name: test/optimizer/sampling_pushdown.test
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# description: Test Sampling Pushdown optimization
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# group: [optimizer]
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statement ok
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CREATE TABLE integers1(i INTEGER, j INTEGER)
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statement ok
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CREATE TABLE integers2(i INTEGER, j INTEGER)
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statement ok
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INSERT INTO integers1 VALUES (1,1), (2,2), (3, 3), (4,4)
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statement ok
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INSERT INTO integers2 VALUES (1,1), (2,2), (3, 3), (4,4)
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# tablesample system + seq scan becomes sample scan
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query II
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EXPLAIN SELECT i FROM integers1 tablesample system(0.1%)
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----
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physical_plan <REGEX>:.*SEQ_SCAN.*System: 0.1%.*
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# using sample system + seq scan becomes sample scan
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query II
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EXPLAIN SELECT i FROM integers1 using sample system(0.1%)
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----
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physical_plan <REGEX>:.*SEQ_SCAN.*System: 0.1%.*
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# tablesample system + seq scan with join becomes sample scan with join
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query II
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EXPLAIN SELECT * FROM integers1 tablesample system(0.1%), integers2 tablesample system(0.1%)
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----
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physical_plan <REGEX>:.*SEQ_SCAN.*System: 0.1%.*
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# tablesample bernoulli: no pushdown
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query II
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EXPLAIN SELECT i FROM integers1 tablesample bernoulli(0.1%)
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----
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physical_plan <REGEX>:.*Bernoulli.*SEQ_SCAN.*
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# tablesample reservoir: no pushdown
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query II
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EXPLAIN SELECT i FROM integers1 tablesample reservoir(0.1%)
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----
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physical_plan <REGEX>:.*RESERVOIR_SAMPLE.*SEQ_SCAN.*
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# tablesample system after a derived table: no pushdown
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query II
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EXPLAIN SELECT * FROM integers1, integers2 where integers1.i = integers2.i USING SAMPLE SYSTEM(25%)
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----
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physical_plan <REGEX>:.*System.*SEQ_SCAN.* |