CreateQuery n2 (children 3)
 Identifier n2
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value (children 1)
    DataType Int64
 Storage definition (children 3)
  Function MergeTree
  Identifier key
  Set
