SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function count (children 1)
     ExpressionList
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier constCondOptimization
   Function if (children 1)
    ExpressionList (children 3)
     Literal UInt64_0
     Literal UInt64_1
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier n
       Literal UInt64_1000