Fix query cache memory leak.

Clearing cache buffers in case of no oid queries (like BEGIN,
CHECKPOINT, VACUUM, etc) should have been done, but it did not.
Patch from Dang Minh Huong.

diff --git a/pool_memqcache.c b/pool_memqcache.c
index 4031d16c19ed257d85e5b6d6e3845cec2b700981..db05cb3d1e33349ecfa89d83bbcd3b5874c0650c 100644 (file)
--- a/pool_memqcache.c
+++ b/pool_memqcache.c
@@ -3246,6 +3246,14 @@ void pool_handle_query_cache(POOL_CONNECTION_POOL *backend, char *query, Node *n
                                        pool_check_and_discard_cache_buffer(num_oids, oids);
                                } 
                        }
+                       else if (num_oids == 0)
+                       {
+                               /* 
+                                * It is also necessary to clear cache buffers in case of
+                                * no oid queries (like BEGIN, CHECKPOINT, VACUUM, etc) too.
+                                */
+                               pool_reset_memqcache_buffer();
+                       }
                }
        }
 }