66 lines
1.3 KiB
SQL
66 lines
1.3 KiB
SQL
# name: test/optimizer/limit_pushdown.test
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# description: Test Limit Pushdown optimization
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# group: [optimizer]
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statement ok
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CREATE TABLE integers(i INTEGER, j INTEGER)
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statement ok
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PRAGMA explain_output = OPTIMIZED_ONLY;
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statement ok
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INSERT INTO integers VALUES (1,1), (2,2), (3, 3), (4,4)
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# project + limit becomes limit + project
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query II
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EXPLAIN SELECT i FROM integers LIMIT 4
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----
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logical_opt <REGEX>:.*PROJECTION.*LIMIT.*
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# verify result for project + limit to limit + project
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query I
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SELECT i FROM integers LIMIT 4
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----
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1
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2
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3
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4
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# recursive limit pushdown
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query II
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EXPLAIN SELECT i FROM (SELECT i, i+1 FROM integers) LIMIT 4
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----
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logical_opt <REGEX>:.*PROJECTION.*PROJECTION.*LIMIT.*
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# verify result for recursive limit pushdown and offset
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query I
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SELECT i FROM (SELECT i, i+1 FROM integers) LIMIT 4 OFFSET 2
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----
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3
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4
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# only offset: no pushdown
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query II
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EXPLAIN SELECT i FROM integers OFFSET 4
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----
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logical_opt <REGEX>:.*LIMIT.*PROJECTION.*
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# limit and offset
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query II
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EXPLAIN SELECT i FROM integers LIMIT 4 OFFSET 2
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----
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logical_opt <REGEX>:.*PROJECTION.*LIMIT.*
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# verify result for limit and offset
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query I
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SELECT i FROM integers LIMIT 4 OFFSET 2
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----
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3
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4
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# limit value > 8192: no pushdown
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query II
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EXPLAIN SELECT i FROM integers LIMIT 8192
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----
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logical_opt <REGEX>:.*LIMIT.*PROJECTION.*
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