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9790aa98ac
This adds a position mapper that takes series from a head block in the order they were appended and creates a mapping representing them in order of their label sets. Write-repair of the postings list would cause very expensive writing. Hence, we keep them as they are and only apply the postition mapping at the very end, after a postings list has been sufficienctly reduced through intersections etc.
36 lines
558 B
Go
36 lines
558 B
Go
package tsdb
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import (
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"sort"
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"testing"
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"github.com/stretchr/testify/require"
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)
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func TestPositionMapper(t *testing.T) {
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cases := []struct {
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in []int
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res []int
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}{
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{
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in: []int{5, 4, 3, 2, 1, 0},
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res: []int{5, 4, 3, 2, 1, 0},
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},
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{
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in: []int{1, 2, 0, 3},
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res: []int{1, 2, 0, 3},
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},
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{
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in: []int{1, 2, 0, 3, 10, 100, -10},
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res: []int{2, 3, 1, 4, 5, 6, 0},
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},
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}
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for _, c := range cases {
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m := newPositionMapper(sort.IntSlice(c.in))
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require.True(t, sort.IsSorted(m.sortable))
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require.Equal(t, c.res, m.fw)
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}
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}
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