CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration timestamp (children 1)
    DataType DateTime (children 1)
     ExpressionList (children 1)
      Literal \'UTC\'
   ColumnDeclaration i (children 1)
    DataType UInt8
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Function toYYYYMM (children 1)
   ExpressionList (children 1)
    Identifier timestamp
  Identifier i