diff --git a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
index b70e607017..633bc17c14 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMergeTree.c
@@ -454,6 +454,9 @@ static int32_t loadSttStatisticsBlockData(SSttFileReader *pSttFileReader, SSttBl
           }
 
           i += 1;
+          tsdbDebug("index:%d, add record, num:%d, hasPk:%d, numInPk:%d", i,
+                    taosArrayGetSize(pBlockLoadInfo->info.pUid), record.firstKey.numOfPKs,
+                    taosArrayGetSize(pBlockLoadInfo->info.pFirstKey));
 
           if (record.firstKey.numOfPKs > 0) {
             ASSERT(taosArrayGetSize(pBlockLoadInfo->info.pLastKey) == taosArrayGetSize(pBlockLoadInfo->info.pFirstTs));