From 3baa8ea0f6429bc9c1fedd54f507397877545529 Mon Sep 17 00:00:00 2001
From: "Jason E. Aten" <jason.aten@molecula.com>
Date: Thu, 29 Oct 2020 01:47:26 +0000
Subject: [PATCH] check if roaring data present with RoaringHasData

---
 dbshard.go | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/dbshard.go b/dbshard.go
index 6fc057200..ae69c8867 100644
--- a/dbshard.go
+++ b/dbshard.go
@@ -303,6 +303,10 @@ func newShardSet() *shardSet {
 func (per *DBPerShard) HasData(which int) (hasData bool, err error) {
 	// has to aggregate across all available DBShard for each index and shard.
 
+	if per.types[which] == roaringTxn {
+		return per.RoaringHasData()
+	}
+
 	for _, v := range per.Flatmap {
 		hasData, err = v.W[which].HasData()
 		if err != nil {
@@ -315,6 +319,21 @@ func (per *DBPerShard) HasData(which int) (hasData bool, err error) {
 	return
 }
 
+func (per *DBPerShard) RoaringHasData() (bool, error) {
+	idxs := per.holder.Indexes()
+	const requireData = true
+	for _, idx := range idxs {
+		shards, err := per.TypedDBPerShardGetShardsForIndex(roaringTxn, idx, "", requireData)
+		if err != nil {
+			return false, err
+		}
+		if len(shards) > 0 {
+			return true, nil
+		}
+	}
+	return false, nil
+}
+
 func (per *DBPerShard) ListOpenString() (r string) {
 	for _, v := range per.Flatmap {
 		r += v.HolderPath + " -> " + v.W[per.useOpenList].OpenListString() + "\n"