From aefdc57f1eb20115ad0a8eb05d9637b08988524f Mon Sep 17 00:00:00 2001
From: "zhaozhao.zz" <zhaozhao.zz@alibaba-inc.com>
Date: Thu, 6 Jul 2023 13:17:25 +0800
Subject: [PATCH] add an assertion to make sure numkeys is 0 in
 getKeysUsingKeySpecs (#12389)

This is an addition to #12380, to prevent potential bugs when collecting
keys from multiple commands in the future.
Note that this function also resets numkeys in some cases.
---
 src/db.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/db.c b/src/db.c
index 48462ddb0..7b34fcb47 100644
--- a/src/db.c
+++ b/src/db.c
@@ -1873,7 +1873,7 @@ int64_t getAllKeySpecsFlags(struct redisCommand *cmd, int inv) {
 int getKeysUsingKeySpecs(struct redisCommand *cmd, robj **argv, int argc, int search_flags, getKeysResult *result) {
     int j, i, last, first, step;
     keyReference *keys;
-    result->numkeys = 0;
+    serverAssert(result->numkeys == 0); /* caller should initialize or reset it */
 
     for (j = 0; j < cmd->key_specs_num; j++) {
         keySpec *spec = cmd->key_specs + j;