SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Literal \'dt < const dt64\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier dt64test
   Function less (children 1)
    ExpressionList (children 2)
     Identifier dt_column
     Function toDateTime64 (children 1)
      ExpressionList (children 2)
       Literal \'2020-01-13 13:37:00\'
       Literal UInt64_3
