SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function materialize (children 1)
     ExpressionList (children 1)
      Function materialize (children 1)
       ExpressionList (children 1)
        Function toLowCardinality (children 1)
         ExpressionList (children 1)
          Literal UInt64_15
    Function dictGetOrDefault (children 1)
     ExpressionList (children 4)
      Literal \'hashed_array_dictionary\'
      Literal Tuple_(\'v1\', \'v2\')
      Literal UInt64_0
      Function tuple (children 1)
       ExpressionList (children 3)
        Function intDiv (children 1)
         ExpressionList (children 2)
          Function materialize (children 1)
           ExpressionList (children 1)
            Literal NULL
          Identifier id
        Function intDiv (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Identifier id
        Function intDiv (children 1)
         ExpressionList (children 2)
          Literal UInt64_1
          Identifier id
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier dictionary_source_table
