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45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
> 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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MergingSorted
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Limit 10
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MergeSorting
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Limit 10
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PartialSorting
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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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> 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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> 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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> 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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> 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, 4) :: 2, minus(s, 8) :: 1) -> 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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> 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(minus(y, 4), notEquals(y, 0))
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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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