Merge remote-tracking branch 'origin/5.5' into 10.1

mysql-test/r/type_int.result

 #
+# Start of 5.5 tests
+#
+#
+# MDEV-15955 Assertion `field_types == 0 || field_types[field_pos] == MYSQL_TYPE_LONGLONG' failed in Protocol_text::store_longlong
+#
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT @a := 1 FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+@a := 1
+1
+SELECT COALESCE(1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+COALESCE(1)
+1
+SELECT COALESCE(@a:=1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+COALESCE(@a:=1)
+1
+SELECT COALESCE(@a) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+COALESCE(@a)
+1
+DROP TABLE t1;
+#
+# End of 5.5 tests
+#
+#
 # Start of 10.1 tests
 #
 #

mysql-test/t/type_int.test

+--echo #
+--echo # Start of 5.5 tests
+--echo #
+
+--echo #
+--echo # MDEV-15955 Assertion `field_types == 0 || field_types[field_pos] == MYSQL_TYPE_LONGLONG' failed in Protocol_text::store_longlong
+--echo #
+
+CREATE TABLE t1 (a INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT @a := 1 FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+SELECT COALESCE(1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+SELECT COALESCE(@a:=1) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+SELECT COALESCE(@a) FROM t1 ORDER BY STRCMP(STDDEV_SAMP(a), 'bar');
+DROP TABLE t1;
+
+--echo #
+--echo # End of 5.5 tests
+--echo #
+
+
 --echo #
 --echo # Start of 10.1 tests
 --echo #

sql/sql_select.cc

@@ -16158,6 +16158,29 @@ static Field *create_tmp_field_from_item(THD *thd, Item *item, TABLE *table,
 {
   Field *UNINIT_VAR(new_field);
   DBUG_ASSERT(thd == table->in_use);
+  if (item->type() == Item::FUNC_ITEM &&
+      static_cast<Item_func*>(item)->functype() == Item_func::SUSERVAR_FUNC)
+  {
+    /*
+      A temporary solution for versions 5.5 .. 10.3.
+      This change should be null-merged to 10.4.
+
+      Item_func_set_user_var is special. It overrides make_field().
+      by adding a special branch `if (result_field)...`.
+      So it's important to preserve the exact data type here,
+      to avoid type mismatch in Protocol_text::store_longlong()
+      See MDEV-15955.
+
+      Other Item_func descendants are not affected by MDEV-15955.
+      They don't override make_field() so they don't use result_field
+      when initializing Send_field.
+
+      This is properly fixed in 10.4 in the method
+      Item_func_user_var::create_tmp_field_ex().
+    */
+    new_field= item->tmp_table_field_from_field_type(table, false, true);
+  }
+  else
     new_field= item->Item::create_tmp_field(false, table);
 
   if (copy_func &&