CreateQuery t2 (children 3)
 Identifier t2
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 3)
     Literal UInt64_1 (alias user_id)
     Literal \'website\' (alias event_source)
     Function CAST (alias timestamp) (children 1)
      ExpressionList (children 2)
       Literal \'2023-01-01 00:00:00\'
       Literal \'DateTime\'
