CreateQuery dm_metric_small2 (children 3)
 Identifier dm_metric_small2
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration x (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int64
   ColumnDeclaration y (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int64
   ColumnDeclaration z (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Int64
 Storage definition (children 3)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 3)
    Identifier x
    Identifier y
    Identifier z
  Set
