anchor.diff:  /*
   T-SQL (Transact-SQL, MSSQL) grammar.
   The MIT License (MIT).
  -Copyright (c) 2015-2016, Ivan Kochurkin (kvanttt@gmail.com), Positive Technologies.
  +Copyright (c) 2015-2017, Ivan Kochurkin (kvanttt@gmail.com), Positive Technologies.
   Copyright (c) 2016, Scott Ure (scott@redstormsoftware.com).
   Copyright (c) 2016, Rui Zhang (ruizhang.ccs@gmail.com).
   Copyright (c) 2016, Marcus Henriksson (kuseman80@gmail.com).
  
positive.code:     | LOCAL_ID
      ;
  
  full_column_name (
      : (table_name '.')? id
      ;
  
  column_name_list_with_order
      : id (ASC | DESC)? (',' id (ASC | DESC)?)*
      ;
  
  cursor_name
  
negative.code:     | MIN_ACTIVE_ROWVERSION
      // https://msdn.microsoft.com/en-us/library/ms177562.aspx
      | NULLIF '(' expression ',' expression ')'
      // https://msdn.microsoft.com/fr-fr/library/ms188043.aspx
      | STUFF '(' expression ',' DECIMAL ',' DECIMAL ',' expression ')'
      // https://msdn.microsoft.com/en-us/library/ms177587.aspx
      | SESSION_USER
      // https://msdn.microsoft.com/en-us/library/ms179930.aspx
  