PSPP-BUG: [bug #22629] Datasheet/Casereader/GtkSheet optimisation

[John Darrington]

URL:
  <http://savannah.gnu.org/bugs/?22629>

                 Summary: Datasheet/Casereader/GtkSheet optimisation
                 Project: PSPP
            Submitted by: jmd
            Submitted on: Monday 03/17/08 at 09:31
                Category: Graphical User Interface
                Severity: 3 - Ordinary
                  Status: None
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None
                  Effort: 0.00

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Details:

Opening certain kinds of data experiences unacceptable delay, while the
casereader iterates its data, in order to find the total number of cases.

src/data/datasheet.c lib/gtksheet/gtksheet.c and all layers in between,
currently have functions of the form:

 int get_number_of_cases (object *);

In most instances, gtksheet ends up using this function, thus:

if ( get_number_of_cases (o) >= max_rows))
 {
 }

Hence it doesn't actually need to know the total number.  Instead, we should
replace these functions with ones like

bool case_count_exceeds (object *, int x);






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