diff --git a/src/kit/taosdemo/taosdemo.c b/src/kit/taosdemo/taosdemo.c
index 30d8a1e67524e692ef468bd34bc2240fdaed7991..282a5d64ab0e631a4d165a942205f56d69239c66 100644
--- a/src/kit/taosdemo/taosdemo.c
+++ b/src/kit/taosdemo/taosdemo.c
@@ -102,7 +102,7 @@ extern char configDir[];
 #define NOTE_BUFF_LEN           (SMALL_BUFF_LEN*16)
 
 #define DEFAULT_TIMESTAMP_STEP  1
-
+#define DEFAULT_CHILDTABLES     10000
 
 enum TEST_MODE {
     INSERT_TEST,            // 0
@@ -625,7 +625,7 @@ SArguments g_args = {
     0,               // interlace_rows;
     30000,           // num_of_RPR
     (1024*1024),     // max_sql_len
-    10000,           // num_of_tables
+    DEFAULT_CHILDTABLES,    // num_of_tables
     10000,           // num_of_DPT
     0,               // abort
     0,               // disorderRatio
@@ -639,7 +639,7 @@ SArguments g_args = {
 
 
 static SDbs            g_Dbs;
-static int64_t         g_totalChildTables = 0;
+static int64_t         g_totalChildTables = DEFAULT_CHILDTABLES;
 static int64_t         g_actualChildTables = 0;
 static SQueryMetaInfo  g_queryInfo;
 static FILE *          g_fpOfInsertResult = NULL;
@@ -9154,6 +9154,7 @@ int main(int argc, char *argv[]) {
     debugPrint("meta file: %s\n", g_args.metaFile);
 
     if (g_args.metaFile) {
+        g_totalChildTables = 0;
         initOfInsertMeta();
         initOfQueryMeta();
 
diff --git a/src/query/src/qPercentile.c b/src/query/src/qPercentile.c
index e9022db503f005ae6713e66e47bbde440bb4aaf7..024ba77de13086b7ff8e32ab2c4c7340d8806b6b 100644
--- a/src/query/src/qPercentile.c
+++ b/src/query/src/qPercentile.c
@@ -67,10 +67,18 @@ static int32_t setBoundingBox(MinMaxEntry* range, int16_t type, double minval, d
 
   if (IS_SIGNED_NUMERIC_TYPE(type)) {
     range->i64MinVal = (int64_t) minval;
-    range->i64MaxVal = (int64_t) maxval;
+    if (maxval > INT64_MAX || (int64_t)maxval == INT64_MIN) {
+      range->i64MaxVal = INT64_MAX;
+    } else {
+      range->i64MaxVal = (int64_t) maxval; 
+    }
   } else if (IS_UNSIGNED_NUMERIC_TYPE(type)){
     range->u64MinVal = (uint64_t) minval;
-    range->u64MaxVal = (uint64_t) maxval;
+    if ((uint64_t)maxval > UINT64_MAX) {
+      range->u64MaxVal = UINT64_MAX;
+    } else {
+      range->u64MaxVal = (uint64_t) maxval;
+    }
   } else {
     range->dMinVal = minval;
     range->dMaxVal = maxval;
@@ -127,8 +135,8 @@ int32_t tBucketIntHash(tMemBucket *pBucket, const void *value) {
     index = (delta % pBucket->numOfSlots);
   } else {
     double slotSpan = (double)span / pBucket->numOfSlots;
-    index = (int32_t)((v - pBucket->range.i64MinVal) / slotSpan);
-    if (v == pBucket->range.i64MaxVal) {
+    index = (int32_t)(((double)v - pBucket->range.i64MinVal) / slotSpan);
+    if (index == pBucket->numOfSlots) {
       index -= 1;
     }
   }