CreateQuery t_sparse_pk (children 3)
 Identifier t_sparse_pk
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration k (children 1)
    DataType UInt64
   ColumnDeclaration s (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Identifier k
  Set