CreateQuery t1 (children 3)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt32
   ColumnDeclaration attr (children 1)
    DataType UInt32
 Storage definition (children 3)
  Function MergeTree
  Identifier id
  Set
