Merge pull request #443 from RoaringBitmap/issue440

more fixes regarding issue 440

arraycontainer.go

@@ -1227,12 +1227,10 @@ func (ac *arrayContainer) numberOfRuns() (nr int) {
 // convert to run or array *if needed*
 func (ac *arrayContainer) toEfficientContainer() container {
 	numRuns := ac.numberOfRuns()
-
 	sizeAsRunContainer := runContainer16SerializedSizeInBytes(numRuns)
 	sizeAsBitmapContainer := bitmapContainerSizeInBytes()
 	card := ac.getCardinality()
 	sizeAsArrayContainer := arrayContainerSizeInBytes(card)
-
 	if sizeAsRunContainer < minOfInt(sizeAsBitmapContainer, sizeAsArrayContainer) {
 		return newRunContainer16FromArray(ac)
 	}

roaring_test.go

@@ -49,6 +49,30 @@ func TestIssue440_3(t *testing.T) {
 	require.Equal(t, b1, b2)
 }
 
+func TestIssue440_4(t *testing.T) {
+	a := NewBitmap()
+	a.AddMany([]uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13})
+	a.RunOptimize()
+	b1, err := a.MarshalBinary()
+	require.NoError(t, err)
+	a.RunOptimize()
+	b2, err := a.MarshalBinary()
+	require.NoError(t, err)
+	require.Equal(t, b1, b2)
+}
+
+func TestIssue440_5(t *testing.T) {
+	a := NewBitmap()
+	a.AddMany([]uint32{1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14})
+	a.RunOptimize()
+	b1, err := a.MarshalBinary()
+	require.NoError(t, err)
+	a.RunOptimize()
+	b2, err := a.MarshalBinary()
+	require.NoError(t, err)
+	require.Equal(t, b1, b2)
+}
+
 func checkValidity(t *testing.T, rb *Bitmap) {
 	t.Helper()
 

runcontainer.go

@@ -42,7 +42,6 @@ import (
 	"errors"
 	"fmt"
 	"sort"
-	"unsafe"
 )
 
 // runContainer16 does run-length encoding of sets of
@@ -1013,12 +1012,10 @@ func newRunContainer16TakeOwnership(iv []interval16) *runContainer16 {
 }
 
 const (
-	baseRc16Size        = int(unsafe.Sizeof(runContainer16{}))
-	perIntervalRc16Size = int(unsafe.Sizeof(interval16{}))
+	baseRc16Size        = 2
+	perIntervalRc16Size = 4
 )
 
-const baseDiskRc16Size = int(unsafe.Sizeof(uint16(0)))
-
 // see also runContainer16SerializedSizeInBytes(numRuns int) int
 
 // getSizeInBytes returns the number of bytes of memory
@@ -1030,7 +1027,7 @@ func (rc *runContainer16) getSizeInBytes() int {
 // runContainer16SerializedSizeInBytes returns the number of bytes of disk
 // required to hold numRuns in a runContainer16.
 func runContainer16SerializedSizeInBytes(numRuns int) int {
-	return perIntervalRc16Size*numRuns + baseDiskRc16Size
+	return perIntervalRc16Size*numRuns + baseRc16Size
 }
 
 // Add adds a single value k to the set.
@@ -2521,7 +2518,7 @@ func (rc *runContainer16) toEfficientContainer() container {
 	sizeAsBitmapContainer := bitmapContainerSizeInBytes()
 	card := rc.getCardinality()
 	sizeAsArrayContainer := arrayContainerSizeInBytes(card)
-	if sizeAsRunContainer > minOfInt(sizeAsBitmapContainer, sizeAsArrayContainer) {
+	if sizeAsRunContainer < minOfInt(sizeAsBitmapContainer, sizeAsArrayContainer) {
 		return rc
 	}
 	if card <= arrayDefaultMaxSize {