MDEV-14041 Server crashes in String::length on queries with functions and ROLLUP

1 files changed, 39 insertions, 0 deletions

diff --git a/sql/item.h b/sql/item.h
index 4b93d3f9164..5c432887ed9 100644
--- a/sql/item.h
+++ b/sql/item.h
@@ -663,6 +663,45 @@ protected:
   SEL_TREE *get_mm_tree_for_const(RANGE_OPT_PARAM *param);
 
   Field *create_tmp_field(bool group, TABLE *table, uint convert_int_length);
+  /* Helper methods, to get an Item value from another Item */
+  double val_real_from_item(Item *item)
+  {
+    DBUG_ASSERT(fixed == 1);
+    double value= item->val_real();
+    null_value= item->null_value;
+    return value;
+  }
+  longlong val_int_from_item(Item *item)
+  {
+    DBUG_ASSERT(fixed == 1);
+    longlong value= item->val_int();
+    null_value= item->null_value;
+    return value;
+  }
+  String *val_str_from_item(Item *item, String *str)
+  {
+    DBUG_ASSERT(fixed == 1);
+    String *res= item->val_str(str);
+    if (res)
+      res->set_charset(collation.collation);
+    if ((null_value= item->null_value))
+      res= NULL;
+    return res;
+  }
+  my_decimal *val_decimal_from_item(Item *item, my_decimal *decimal_value)
+  {
+    DBUG_ASSERT(fixed == 1);
+    my_decimal *value= item->val_decimal(decimal_value);
+    if ((null_value= item->null_value))
+      value= NULL;
+    return value;
+  }
+  bool get_date_from_item(Item *item, MYSQL_TIME *ltime, ulonglong fuzzydate)
+  {
+    bool rc= item->get_date(ltime, fuzzydate);
+    null_value= MY_TEST(rc || item->null_value);
+    return rc;
+  }
   /*
     This method is used if the item was not null but convertion to
     TIME/DATE/DATETIME failed. We return a zero date if allowed,