From 9682295f68e5bd7ca72441ced23ba35539bdaeec Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Thu, 3 Apr 2014 10:37:32 +0200
Subject: [PATCH] PFCOUNT: unshare the object when cached cardinality is
 modified.

---
 src/hyperloglog.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/hyperloglog.c b/src/hyperloglog.c
index ddbcf9bfd..7fad34d5b 100644
--- a/src/hyperloglog.c
+++ b/src/hyperloglog.c
@@ -541,6 +541,9 @@ void pfcountCommand(redisClient *c) {
             card |= (uint64_t)registers[REDIS_HLL_SIZE-9] << 56;
         } else {
             /* Recompute it and update the cached value. */
+            o = dbUnshareStringValue(c->db,c->argv[1],o);
+            registers = o->ptr;
+
             card = hllCount(registers);
             registers[REDIS_HLL_SIZE-16] = card & 0xff;
             registers[REDIS_HLL_SIZE-15] = (card >> 8) & 0xff;
-- 
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