SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 3)
    Function toNullable (alias a) (children 1)
     ExpressionList (children 1)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function _CAST (children 1)
         ExpressionList (children 2)
          Literal UInt64_30
          Literal \'LowCardinality(UInt8)\'
    Function _CAST (alias b) (children 1)
     ExpressionList (children 2)
      Literal UInt64_30
      Literal \'LowCardinality(UInt8)\'
    Function makeDate (alias c) (children 1)
     ExpressionList (children 3)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function _CAST (children 1)
         ExpressionList (children 2)
          Literal UInt64_30
          Literal \'LowCardinality(UInt8)\'
      Literal UInt64_10
      Function _CAST (children 1)
       ExpressionList (children 2)
        Literal UInt64_30
        Literal \'Nullable(UInt8)\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.one
   ExpressionList (children 1)
    Function _CAST (children 1)
     ExpressionList (children 2)
      Literal UInt64_30
      Literal \'Nullable(UInt8)\'
   Set
