CreateQuery d2 (children 3)
 Identifier d2
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType Int
   ColumnDeclaration value (children 1)
    DataType Int
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier key
