>But to do so seems likely to require an incompatible change to the
>virtual-table interface.
Could I kindly request an addition to the incompatible change to the
virtual-table interface?
I would very much appreciate a corresponding function to
function xRowID(
pCursor: psqlite3_vtab_cursor;
pRowID: PInt64): Integer;
which would notify virtual table implementations that the the SQLite engine no
longer uses this particular RowID like, for example:
function xRowID_Done(
pCursor: psqlite3_vtab_cursor;
pRowID: PInt64): Integer;
The reason behind this is that some DB engines store RowIDs / BookMarks in
malloced memory structures. Obviously, they have to be freed when no longer in
use. Unfortunately, the current VT interface does not give notice when this is
the case. With xRowID_Done, implementations will be able to free malloced
memory when no longer needed by SQLite and thus avoid accumulating malloced
RowIDs until the table is closed.
Ralf
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