Fix change_column functionality

spec/fixtures/migrations/dsl_change_column/1_create_some_table.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+
+class CreateSomeTable < ActiveRecord::Migration[7.1]
+  def up
+    create_table :some, options: 'MergeTree ORDER BY id' do |t|
+      t.integer :col, limit: 4, null: false
+    end
+  end
+end
+

spec/fixtures/migrations/dsl_change_column/2_alter_col_column.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AlterColColumn < ActiveRecord::Migration[7.1]
+  def up
+    change_column :some, :col, :int64, null: false
+  end
+end

spec/single/migration_spec.rb

@@ -340,6 +340,21 @@
       end
     end
 
+    describe 'alter column' do
+      let(:directory) { 'dsl_change_column' }
+      it 'alters the column' do
+        subject
+
+        current_schema = schema(model)
+
+        expect(current_schema.keys.count).to eq(2)
+        expect(current_schema).to have_key('id')
+        expect(current_schema).to have_key('col')
+        expect(current_schema['id'].sql_type).to eq('UInt32')
+        expect(current_schema['col'].sql_type).to eq('Int64')
+      end
+    end
+
     context 'function creation' do
       after do
         ActiveRecord::Base.connection.drop_functions

spec/spec_helper.rb

@@ -39,8 +39,8 @@
     host: 'localhost',
     port: ENV['CLICKHOUSE_PORT'] || 8123,
     database: ENV['CLICKHOUSE_DATABASE'] || 'test',
-    username: nil,
-    password: nil,
+    username: 'default',
+    password: 'docker',
     use_metadata_table: false,
     cluster_name: ENV['CLICKHOUSE_CLUSTER'],
   }