CreateQuery distinct_in_order (children 3)
 Identifier distinct_in_order
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration low (children 1)
    DataType UInt64
   ColumnDeclaration medium (children 1)
    DataType UInt64
   ColumnDeclaration high (children 1)
    DataType UInt64
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier low
    Identifier medium
  Set
