CreateQuery summing_merge_tree_null (children 3)
 Identifier summing_merge_tree_null
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration d (children 1)
    Function today (children 1)
     ExpressionList
   ColumnDeclaration k (children 1)
    DataType UInt64
   ColumnDeclaration c (children 1)
    DataType UInt64
   ColumnDeclaration u (children 1)
    DataType UInt64
 Storage definition (children 1)
  Function Null