InsertQuery   (children 3)
 Identifier check_table_test
 ExpressionList (children 1)
  Identifier value1
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 1)
     Identifier value
    TablesInSelectQuery (children 1)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier system.events
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier event
      Literal \'Merge\'
