pass structure_dump_flags / structure_load_flags options before a…

…ny other:

- On Mysql, some command line options that affect option-file handling such as `--no-defaults` have to be passed before any other options
- Modified rails to pass them right after the `mysql` command
- Ref https://dev.mysql.com/doc/refman/5.7/en/option-file-options.html and https://bugs.mysql.com/bug.php?id=83386
- Ref #27437

activerecord/lib/active_record/tasks/mysql_database_tasks.rb

@@ -59,14 +59,14 @@ def structure_dump(filename, extra_flags)
         args.concat(["--no-data"])
         args.concat(["--routines"])
         args.concat(["--skip-comments"])
-        args.concat(Array(extra_flags)) if extra_flags
 
         ignore_tables = ActiveRecord::SchemaDumper.ignore_tables
         if ignore_tables.any?
           args += ignore_tables.map { |table| "--ignore-table=#{configuration['database']}.#{table}" }
         end
 
         args.concat(["#{configuration['database']}"])
+        args.insert(0, Array(extra_flags)).flatten! if extra_flags
 
         run_cmd("mysqldump", args, "dumping")
       end
@@ -75,7 +75,7 @@ def structure_load(filename, extra_flags)
         args = prepare_command_options
         args.concat(["--execute", %{SET FOREIGN_KEY_CHECKS = 0; SOURCE #{filename}; SET FOREIGN_KEY_CHECKS = 1}])
         args.concat(["--database", "#{configuration['database']}"])
-        args.concat(Array(extra_flags)) if extra_flags
+        args.insert(0, Array(extra_flags)).flatten! if extra_flags
 
         run_cmd("mysql", args, "loading")
       end

activerecord/test/cases/tasks/mysql_rake_test.rb

@@ -296,7 +296,7 @@ def test_structure_dump
 
       def test_structure_dump_with_extra_flags
         filename = "awesome-file.sql"
-        expected_command = ["mysqldump", "--result-file", filename, "--no-data", "--routines", "--skip-comments", "--noop", "test-db"]
+        expected_command = ["mysqldump", "--noop", "--result-file", filename, "--no-data", "--routines", "--skip-comments", "test-db"]
 
         assert_called_with(Kernel, :system, expected_command, returns: true) do
           with_structure_dump_flags(["--noop"]) do
@@ -364,7 +364,7 @@ def setup
 
       def test_structure_load
         filename = "awesome-file.sql"
-        expected_command = ["mysql", "--execute", %{SET FOREIGN_KEY_CHECKS = 0; SOURCE #{filename}; SET FOREIGN_KEY_CHECKS = 1}, "--database", "test-db", "--noop"]
+        expected_command = ["mysql", "--noop", "--execute", %{SET FOREIGN_KEY_CHECKS = 0; SOURCE #{filename}; SET FOREIGN_KEY_CHECKS = 1}, "--database", "test-db"]
 
         assert_called_with(Kernel, :system, expected_command, returns: true) do
           with_structure_load_flags(["--noop"]) do