Remove unnecessary seriesHashCache interface

Signed-off-by: Dimitar Dimitrov <dimitar.dimitrov@grafana.com>

pkg/storegateway/bucket_index_postings.go

@@ -13,6 +13,7 @@ import (
 	"github.com/prometheus/prometheus/model/labels"
 	"github.com/prometheus/prometheus/storage"
 	"github.com/prometheus/prometheus/tsdb/encoding"
+	"github.com/prometheus/prometheus/tsdb/hashcache"
 	"github.com/prometheus/prometheus/tsdb/index"
 
 	"github.com/grafana/mimir/pkg/storage/sharding"
@@ -156,7 +157,7 @@ func (it *bigEndianPostings) length() int {
 // filterPostingsByCachedShardHash filters the input postings by the provided shard. It filters only
 // postings for which we have their series hash already in the cache; if a series is not in the cache,
 // postings will be kept in the output.
-func filterPostingsByCachedShardHash(ps []storage.SeriesRef, shard *sharding.ShardSelector, seriesHashCache seriesHashCache) (filteredPostings []storage.SeriesRef, stats queryStats) {
+func filterPostingsByCachedShardHash(ps []storage.SeriesRef, shard *sharding.ShardSelector, seriesHashCache *hashcache.BlockSeriesHashCache) (filteredPostings []storage.SeriesRef, stats queryStats) {
 	writeIdx := 0
 	stats.seriesHashCacheRequests = len(ps)
 

pkg/storegateway/series_refs.go

@@ -604,7 +604,7 @@ type loadingSeriesChunkRefsSetIterator struct {
 	ctx                 context.Context
 	postingsSetIterator *postingsSetsIterator
 	indexr              *bucketIndexReader
-	seriesHashCache     seriesHashCache
+	seriesHashCache     *hashcache.BlockSeriesHashCache
 	indexCache          indexcache.IndexCache
 	stats               *safeQueryStats
 	blockID             ulid.ULID
@@ -905,18 +905,10 @@ type seriesHasher interface {
 	Hash(seriesID storage.SeriesRef, lset labels.Labels, stats *queryStats) uint64
 }
 
-type seriesHashCache interface {
-	Fetch(seriesID storage.SeriesRef) (uint64, bool)
-}
-
 type cachedSeriesHasher struct {
 	cache *hashcache.BlockSeriesHashCache
 }
 
-func (b cachedSeriesHasher) Fetch(seriesID storage.SeriesRef) (uint64, bool) {
-	return b.cache.Fetch(seriesID)
-}
-
 func (b cachedSeriesHasher) Hash(id storage.SeriesRef, lset labels.Labels, stats *queryStats) uint64 {
 	stats.seriesHashCacheRequests++