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http://www.openoffice.org/issues/show_bug.cgi?id=109726
                 Issue #|109726
                 Summary|Empty cell vs empty string in the spreadsheet driver
               Component|Database access
                 Version|OOo 3.1.1
                Platform|Unknown
                     URL|
              OS/Version|All
                  Status|UNCONFIRMED
       Status whiteboard|
                Keywords|
              Resolution|
              Issue type|ENHANCEMENT
                Priority|P3
            Subcomponent|none
             Assigned to|dbaneedsconfirm
             Reported by|villeroy





------- Additional comments from [email protected] Tue Mar  2 08:35:43 
+0000 2010 -------
The spreadsheet driver imports empty cells as empty strings. A numeric column
with gaps imports as numbers or dates.
Strangely, you need to test for empty strings when filtering these row sets:
WHERE "Numbers"=''
WHERE "Numbers" IS NULL fails.

As a matter of fact, many spreadsheets contain calculated empty strings in
numeric columns. For instance:
=IF(B2 ; A2/B2 ; "") 
returns an empty string if B2 evaluates to False (zero or text).
There is no way to make a sheet cell pretend to be empty.

The Base driver treats this column as text.
Base treats empty cells as empty strings but refuses to treat empty strings like
empty cells.

There have are complaints about this in the context of mail merges with
calculated date fields (or empty string).

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