fix(keyviz): find nearest id if not found #1268
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Codecov ReportAttention: Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #1268 +/- ##
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+ Coverage 31.77% 31.94% +0.17%
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Files 310 310
Lines 17642 17712 +70
Branches 806 806
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+ Hits 5605 5658 +53
- Misses 11805 11821 +16
- Partials 232 233 +1
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shhdgit
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pkg/keyvisual/decorator/tidb.go
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| func (inOrder *tableInOrder) findOne(fromID, toID int64) *tableDetail { | ||
| if fromID >= toID { | ||
| return nil | ||
| } | ||
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| inOrder.rwMu.RLock() | ||
| defer inOrder.rwMu.RUnlock() | ||
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| tLen := len(inOrder.tables) | ||
| pivot := tLen / 2 | ||
| left := 0 | ||
| right := tLen | ||
| for pivot > left { | ||
| prevID := inOrder.tables[pivot-1].ID | ||
| id := inOrder.tables[pivot].ID | ||
| // find approaching id near the fromId | ||
| // table_1 ------- table_3 ------- table_5 | ||
| // ^ | ||
| // search table_2 | ||
| // approaching result: table_3 | ||
| if prevID < fromID && id >= fromID { | ||
| break | ||
| } | ||
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| if id < fromID { | ||
| left = pivot | ||
| } else { | ||
| right = pivot | ||
| } | ||
| pivot = (left + right) / 2 | ||
| } | ||
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| id := inOrder.tables[pivot].ID | ||
| if id < fromID || id >= toID { | ||
| return nil | ||
| } | ||
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| return inOrder.tables[pivot] | ||
| } |
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How about simply use the binary search in std?
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Ok, I got it, what you want to do is not a simple binary search.
| // ^ | ||
| // search table_2 | ||
| // approaching result: table_3 | ||
| if prevID < fromID && id >= fromID { |
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Do you mean out of the range logic in L117-L120?😂
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Please fix the lint. Also I believe you need more tests to cover the "findOne" function. For such complicated logic function, maybe better to ensure 100% branch coverage. |
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How about using sort.Search to discover a lower bound, and then check whether it meets upper bound? In this way you don't need to manually write the binary search or lower_bound algorithm. Here is an example of using sort.Search to implement lower_bound: https://go-review.googlesource.com/c/go/+/29333/3/src/sort/example_search_test.go#45 |
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