MDEV-20280 PERCENTILE_DISC() rejects temporal and string input

1 files changed, 12 insertions, 1 deletions

diff --git a/sql/item_windowfunc.h b/sql/item_windowfunc.h
index f38209e4bb5..c3304122c1b 100644
--- a/sql/item_windowfunc.h
+++ b/sql/item_windowfunc.h
@@ -779,12 +779,23 @@ public:
     if (get_row_count() == 0 || get_arg(0)->is_null())
     {
       null_value= true;
-      return 0;
+      return true;
     }
     null_value= false;
     return value->get_date(thd, ltime, fuzzydate);
   }
 
+  bool val_native(THD *thd, Native *to)
+  {
+    if (get_row_count() == 0 || get_arg(0)->is_null())
+    {
+      null_value= true;
+      return true;
+    }
+    null_value= false;
+    return value->val_native(thd, to);
+  }
+
   bool add()
   {
     Item *arg= get_arg(0);