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fix count() cache retrieval

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This commit is contained in:
Ben Johnson 2016-08-12 10:02:57 -06:00
parent 96680a262c
commit 6ad7d0bfab
2 changed files with 12 additions and 1 deletions
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3
cache.go
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@ -51,7 +51,8 @@ func (c *LRUCache) Add(bitmapID, n uint64) {
// Get returns a bitmap with a given id.
func (c *LRUCache) Get(bitmapID uint64) uint64 {
n, _ := c.cache.Get(bitmapID)
return n.(uint64)
nn, _ := n.(uint64)
return nn
}
// Len returns the number of items in the cache.

10
fragment.go
View file

@ -527,6 +527,16 @@ func (f *Fragment) topBitmapPairs(bitmapIDs []uint64) []BitmapPair {
// Otherwise retrieve specific bitmaps.
pairs := make([]BitmapPair, len(bitmapIDs))
for i, bitmapID := range bitmapIDs {
// Look up cache first, if available.
if n := f.cache.Get(bitmapID); n > 0 {
pairs[i] = BitmapPair{
ID: bitmapID,
Count: n,
}
continue
}
// Otherwise load from storage.
pairs[i] = BitmapPair{
ID: bitmapID,
Count: f.Bitmap(bitmapID).Count(),