> sipHash should be calculated after filtration
FUNCTION sipHash64
Filter column: equals
> sorting steps should know about limit
Limit 10
MergingSorted
Limit 10
MergeSorting
Limit 10
PartialSorting
Limit 10
-- filter push down --
> filter should be pushed down after aggregating
Aggregating
Filter
0	1
1	2
2	3
3	4
4	5
5	6
6	7
7	8
8	9
9	10
> filter should be pushed down after aggregating, column after aggregation is const
COLUMN Const(UInt8) -> notEquals(y, 0)
Aggregating
Filter
Filter
0	1	1
1	2	1
2	3	1
3	4	1
4	5	1
5	6	1
6	7	1
7	8	1
8	9	1
9	10	1
> one condition of filter should be pushed down after aggregating, other condition is aliased
Filter column
ALIAS notEquals(s, 4) :: 1 -> and(notEquals(y, 0), notEquals(s, 4))
Aggregating
Filter column: notEquals(y, 0)
0	1
1	2
2	3
3	4
5	6
6	7
7	8
8	9
9	10
> one condition of filter should be pushed down after aggregating, other condition is casted
Filter column
FUNCTION CAST(minus(s, 4) :: 1, UInt8 :: 3) -> and(notEquals(y, 0), minus(s, 4))
Aggregating
Filter column: notEquals(y, 0)
0	1
1	2
2	3
3	4
5	6
6	7
7	8
8	9
9	10
> one condition of filter should be pushed down after aggregating, other two conditions are ANDed
Filter column
FUNCTION and(minus(s, 4) :: 2, minus(s, 8) :: 1) -> and(notEquals(y, 0), minus(s, 8), minus(s, 4))
Aggregating
Filter column: notEquals(y, 0)
0	1
1	2
2	3
3	4
5	6
6	7
7	8
9	10
> two conditions of filter should be pushed down after aggregating and ANDed, one condition is aliased
Filter column
ALIAS notEquals(s, 8) :: 1 -> and(notEquals(y, 0), notEquals(s, 8), minus(y, 4))
Aggregating
Filter column: and(minus(y, 4), notEquals(y, 0))
0	1
1	2
2	3
4	5
5	6
6	7
7	8
9	10
> filter is split, one part is filtered before ARRAY JOIN
Filter column: and(notEquals(y, 2), notEquals(x, 0))
ARRAY JOIN x
Filter column: notEquals(y, 2)
1	3
> filter is pushed down before Distinct
Distinct
Distinct
Filter column: notEquals(y, 2)
0	0
0	1
1	0
1	1
> filter is pushed down before sorting steps
MergingSorted
MergeSorting
PartialSorting
Filter column: and(notEquals(x, 0), notEquals(y, 0))
1	2
1	1