CreateQuery t (children 4)
 Identifier t
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration z (children 1)
    DataType String
   ColumnDeclaration ts (children 1)
    DataType DateTime
 Storage definition (children 2)
  Function MergeTree
  Identifier z
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 1)
    ExpressionList (children 2)
     Literal \'1\'
     Literal \'2020-01-01 00:00:00\'
