title: Save SQL to YAML as is
body: <p>I want to save SQL to YAML-file in my own format as below:</p>
  
  <pre><code>(1)   
  sql: SELECT DISTINCT p.id_product, 
                       p.price AS price, 
                       sp.reduction AS discount
         FROM ....
  </code></pre>
  
  <p>I use following settings of YAML</p>
  
  <pre><code>yaml.safe_dump(app_config,
                 stream,
                 indent=4,
                 default_flow_style=False,
                 encoding='utf-8',
                 allow_unicode=True)
  </code></pre>
  
  <p>however I got 'classic' ugly output of YAML</p>
  
  <pre><code>(2)
  sql: SELECT DISTINCT p.id_product, p.price AS price, sp.reduction AS discount, sp.reduction_type
      AS discount_type, pl.description_short AS description FROM ....
  </code></pre>
  
  <p>Is there any way to achieve output #1?</p>
  
  <p>PS. repr(config) equal:</p>
  
  <pre><code>{'mapping': {'/*ID_LANG*/': 'AND pl.id_lang IN (/*VALUE*/)', '/*REFERENCE*/': "AND p.reference LIKE '%/*VALUE*/%'", }, 'sql': 'SELECT DISTINCT p.id_product, p.price AS price, sp.reduction AS discount, sp.reduction_type AS discount_type, pl.description_short AS description, pl.name AS name, i.id_image as image, p.reference AS model, m.name AS manufacturer, pl.available_now AS stock_status FROM /*PREFIX*/product p LEFT JOIN /*PREFIX*/product_lang pl ON (p.id_product = pl.id_product) LEFT JOIN /*PREFIX*/manufacturer m ON (m.id_manufacturer = p.id_manufacturer) LEFT JOIN /*PREFIX*/image i ON (i.id_product = p.id_product) LEFT JOIN /*PREFIX*/specific_price sp ON (sp.id_product = p.id_product) LEFT JOIN /*PREFIX*/category pc ON p.id_category_default = pc.id_category WHERE i.cover = 1 /*WHERE*/'}
  </code></pre>