Incorrect comment for memset() on pgssHashKey?

Hi,

Commit 6b4d23feef introduces a toplevel field in pgssHashKey, which leads
padding. In pgss_store(), it comments that memset() is required when
pgssHashKey is without padding only.

@@ -1224,9 +1227,14 @@ pgss_store(const char *query, uint64 queryId,
query = CleanQuerytext(query, &query_location, &query_len);

/* Set up key for hashtable search */
+
+ /* memset() is required when pgssHashKey is without padding only */
+ memset(&key, 0, sizeof(pgssHashKey));
+
key.userid = GetUserId();
key.dbid = MyDatabaseId;
key.queryid = queryId;
+ key.toplevel = (exec_nested_level == 0);

/* Lookup the hash table entry with shared lock. */
LWLockAcquire(pgss->lock, LW_SHARED);

However, we need memset() only when pgssHashKey has padding, right?

--
Regrads,
Japin Li.