CreateQuery t (children 3)
 Identifier t
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration x (children 1)
    DataType UInt64
   ColumnDeclaration y (children 1)
    DataType UInt64
   ColumnDeclaration z (children 1)
    DataType UInt64
   ColumnDeclaration k (children 1)
    DataType UInt64
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 3)
    Identifier x
    Identifier y
    Identifier z
  Set
