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 tab
   Function equals (children 1)
    ExpressionList (children 2)
     Function arrayElement (children 1)
      ExpressionList (children 2)
       Identifier map_fixed
       Function toFixedString (children 1)
        ExpressionList (children 2)
         Literal \'K1\'
         Literal UInt64_2
     Literal \'V1\'
