CreateQuery 02481_mergetree (children 3)
 Identifier 02481_mergetree
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration x (children 1)
    DataType UInt64
   ColumnDeclaration y (children 1)
    DataType UInt64
   ColumnDeclaration arr (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 4)
  Function MergeTree
  Identifier x
  Identifier x
  Set
