CreateQuery table_1 (children 3)
 Identifier table_1
 Columns definition (children 2)
  ExpressionList (children 2)
   ColumnDeclaration x (children 1)
    DataType UInt32
   ColumnDeclaration y (children 1)
    DataType String
  ExpressionList (children 1)
   Index (children 2)
    Function length (children 1)
     ExpressionList (children 1)
      Identifier y
    Function minmax (children 1)
     ExpressionList
 Storage definition (children 3)
  Function MergeTree
  Identifier x
  Set
