CreateQuery x (children 3)
 Identifier x
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration dt (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Function toDate (children 1)
     ExpressionList (children 1)
      Identifier dt
  Function tuple (children 1)
   ExpressionList
