Fixed build failure

c0ba036b · Sergey Vojtovich · 901e3ddf · c0ba036b
Commit c0ba036b authored Mar 23, 2019 by Sergey Vojtovich
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sql/item_sum.cc sql/item_sum.cc +1 -1

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--- a/sql/item_sum.cc
+++ b/sql/item_sum.cc
@@ -2042,7 +2042,7 @@ double Item_sum_std::val_real()
 {
  DBUG_ASSERT(fixed == 1);
  double nr= Item_sum_variance::val_real();
-  if (isnan(nr))
+  if (std::isnan(nr))
  {
    /*
      variance_fp_recurrence_next() can overflow in some cases and return "nan":