remove unused addBucket function

Signed-off-by: Ziqi Zhao <zhaoziqi9146@gmail.com>

model/histogram/float_histogram.go

@@ -284,103 +284,6 @@ func (h *FloatHistogram) Equals(h2 *FloatHistogram) bool {
 	return true
 }
 
-// addBucket takes the "coordinates" of the last bucket that was handled and
-// adds the provided bucket after it. If a corresponding bucket exists, the
-// count is added. If not, the bucket is inserted. The updated slices and the
-// coordinates of the inserted or added-to bucket are returned.
-func addBucket(
-	b Bucket[float64],
-	spans []Span, buckets []float64,
-	iSpan, iBucket int,
-	iInSpan, index int32,
-) (
-	newSpans []Span, newBuckets []float64,
-	newISpan, newIBucket int, newIInSpan int32,
-) {
-	if iSpan == -1 {
-		// First add, check if it is before all spans.
-		if len(spans) == 0 || spans[0].Offset > b.Index {
-			// Add bucket before all others.
-			buckets = append(buckets, 0)
-			copy(buckets[1:], buckets)
-			buckets[0] = b.Count
-			if len(spans) > 0 && spans[0].Offset == b.Index+1 {
-				spans[0].Length++
-				spans[0].Offset--
-				return spans, buckets, 0, 0, 0
-			}
-			spans = append(spans, Span{})
-			copy(spans[1:], spans)
-			spans[0] = Span{Offset: b.Index, Length: 1}
-			if len(spans) > 1 {
-				// Convert the absolute offset in the formerly
-				// first span to a relative offset.
-				spans[1].Offset -= b.Index + 1
-			}
-			return spans, buckets, 0, 0, 0
-		}
-		if spans[0].Offset == b.Index {
-			// Just add to first bucket.
-			buckets[0] += b.Count
-			return spans, buckets, 0, 0, 0
-		}
-		// We are behind the first bucket, so set everything to the
-		// first bucket and continue normally.
-		iSpan, iBucket, iInSpan = 0, 0, 0
-		index = spans[0].Offset
-	}
-	deltaIndex := b.Index - index
-	for {
-		remainingInSpan := int32(spans[iSpan].Length) - iInSpan
-		if deltaIndex < remainingInSpan {
-			// Bucket is in current span.
-			iBucket += int(deltaIndex)
-			iInSpan += deltaIndex
-			buckets[iBucket] += b.Count
-			return spans, buckets, iSpan, iBucket, iInSpan
-		}
-		deltaIndex -= remainingInSpan
-		iBucket += int(remainingInSpan)
-		iSpan++
-		if iSpan == len(spans) || deltaIndex < spans[iSpan].Offset {
-			// Bucket is in gap behind previous span (or there are no further spans).
-			buckets = append(buckets, 0)
-			copy(buckets[iBucket+1:], buckets[iBucket:])
-			buckets[iBucket] = b.Count
-			if deltaIndex == 0 {
-				// Directly after previous span, extend previous span.
-				if iSpan < len(spans) {
-					spans[iSpan].Offset--
-				}
-				iSpan--
-				iInSpan = int32(spans[iSpan].Length)
-				spans[iSpan].Length++
-				return spans, buckets, iSpan, iBucket, iInSpan
-			}
-			if iSpan < len(spans) && deltaIndex == spans[iSpan].Offset-1 {
-				// Directly before next span, extend next span.
-				iInSpan = 0
-				spans[iSpan].Offset--
-				spans[iSpan].Length++
-				return spans, buckets, iSpan, iBucket, iInSpan
-			}
-			// No next span, or next span is not directly adjacent to new bucket.
-			// Add new span.
-			iInSpan = 0
-			if iSpan < len(spans) {
-				spans[iSpan].Offset -= deltaIndex + 1
-			}
-			spans = append(spans, Span{})
-			copy(spans[iSpan+1:], spans[iSpan:])
-			spans[iSpan] = Span{Length: 1, Offset: deltaIndex}
-			return spans, buckets, iSpan, iBucket, iInSpan
-		}
-		// Try start of next span.
-		deltaIndex -= spans[iSpan].Offset
-		iInSpan = 0
-	}
-}
-
 // Compact eliminates empty buckets at the beginning and end of each span, then
 // merges spans that are consecutive or at most maxEmptyBuckets apart, and
 // finally splits spans that contain more consecutive empty buckets than