Re: [HACKERS] 6.4.x

Tom Lane wrote:
>
> >>>> (3) does 6.4 support query lengths > 8192, or data blocks > 8192
> >>>> (other than large objects)?
>
> > Sometime in the past Darren K. worked to parameterize this limit.
>
> There has been some discussion of allowing tuples to span multiple
> disk blocks, which would remove the problem entirely, but it hasn't
> happened yet. Maybe for 6.5?

Right now I'm rewriting HeapTuple structure and functions - for
multi-version concurrency control (MVCC). New HeapTuple:

typedef struct HeapTupleData
{
uint32 t_len; /* length of *t_data */
ItemPointerData t_self; /* SelfItemPointer */
HeapTupleHeader t_data; /* */
^^^^^^^^^^^^^^^^^^^^^^^^^^
this is what known as HeapTuple in < 6.5
} HeapTupleData;

I assume that one, who would like implement blocks spanning,
will add something to this new structure.
I need in ~ one week, please wait.

Vadim