CreateQuery t1 (children 3)
 Identifier t1
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType Int32
   ColumnDeclaration key (children 1)
    DataType String
   ColumnDeclaration key2 (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Identifier id
  Set
