mirror of
https://github.com/ClickHouse/ClickHouse.git
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157 lines
2.8 KiB
Plaintext
157 lines
2.8 KiB
Plaintext
Too many optimizations applied to query plan
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Too many optimizations applied to query plan
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> sipHash should be calculated after filtration
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FUNCTION sipHash64
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Filter column: equals
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> sorting steps should know about limit
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Limit 10
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Sorting
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Sorting
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Limit 10
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-- filter push down --
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> filter should be pushed down after aggregating
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Aggregating
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Filter
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0 1
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1 2
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2 3
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3 4
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4 5
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5 6
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6 7
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7 8
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8 9
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9 10
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> filter should be pushed down after aggregating, column after aggregation is const
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COLUMN Const(UInt8) -> notEquals(y, 0)
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Aggregating
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Filter
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Filter
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0 1 1
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1 2 1
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2 3 1
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3 4 1
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4 5 1
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5 6 1
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6 7 1
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7 8 1
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8 9 1
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9 10 1
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> one condition of filter should be pushed down after aggregating, other condition is aliased
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Filter column
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ALIAS notEquals(s, 4) :: 1 -> and(notEquals(y, 0), notEquals(s, 4))
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Aggregating
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Filter column: notEquals(y, 0)
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0 1
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1 2
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2 3
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3 4
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5 6
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6 7
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7 8
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8 9
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9 10
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> one condition of filter should be pushed down after aggregating, other condition is casted
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Filter column
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FUNCTION _CAST(minus(s, 4) :: 1, UInt8 :: 3) -> and(notEquals(y, 0), minus(s, 4))
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Aggregating
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Filter column: notEquals(y, 0)
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0 1
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1 2
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2 3
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3 4
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5 6
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6 7
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7 8
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8 9
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9 10
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> one condition of filter should be pushed down after aggregating, other two conditions are ANDed
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Filter column
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FUNCTION and(minus(s, 8) :: 1, minus(s, 4) :: 2) -> and(notEquals(y, 0), minus(s, 8), minus(s, 4))
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Aggregating
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Filter column: notEquals(y, 0)
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0 1
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1 2
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2 3
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3 4
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5 6
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6 7
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7 8
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9 10
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> two conditions of filter should be pushed down after aggregating and ANDed, one condition is aliased
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Filter column
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ALIAS notEquals(s, 8) :: 1 -> and(notEquals(y, 0), notEquals(s, 8), minus(y, 4))
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Aggregating
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Filter column: and(notEquals(y, 0), minus(y, 4))
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0 1
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1 2
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2 3
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4 5
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5 6
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6 7
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7 8
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9 10
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> filter is split, one part is filtered before ARRAY JOIN
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Filter column: and(notEquals(y, 2), notEquals(x, 0))
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ARRAY JOIN x
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Filter column: notEquals(y, 2)
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1 3
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> filter is pushed down before Distinct
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Distinct
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Distinct
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Filter column: notEquals(y, 2)
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0 0
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0 1
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1 0
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1 1
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> filter is pushed down before sorting steps
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Sorting
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Sorting
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Filter column: and(notEquals(x, 0), notEquals(y, 0))
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1 2
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1 1
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> filter is pushed down before TOTALS HAVING and aggregating
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TotalsHaving
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Aggregating
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Filter column: notEquals(y, 2)
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0 12
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1 15
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3 10
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0 37
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> filter is pushed down before CreatingSets
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CreatingSets
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Filter
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Filter
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1
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3
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> one condition of filter is pushed down before LEFT JOIN
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Join
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Filter column: notEquals(number, 1)
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Join
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0 0
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3 3
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> one condition of filter is pushed down before INNER JOIN
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Join
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Filter column: notEquals(number, 1)
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Join
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3 3
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> filter is pushed down before UNION
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Union
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Filter
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Filter
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2 3
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2 3
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> function calculation should be done after sorting and limit (if possible)
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> the whole Expression node could be moved after Sorting
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Expression
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Limit
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Expression
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Sorting
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> Expression should be divided into two subnodes and only one of them could be moved after Sorting
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Expression
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Limit
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Expression
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Sorting
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Expression
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