Re: Review: Patch to compute Max LSN of Data Pages

Please find the rebased Patch for Compute MAX LSN.

There was one compilation error as "undefined reference to XLByteLT " as earlier  XLogRecPtr was a structure as
                        typedef struct XLogRecPtr
                        {
                                uint32                xlogid;                        /* log file #, 0 based */
                                uint32                xrecoff;                /* byte offset of location in log file */
                        } XLogRecPtr;
So in order to compare two LSN, there was one macro as XLByteLT to compare both fields.
But now XLogRecPtr  has been changed as just uint64 and so XLByteLT is removed.
So the change done is to replace XLByteLT(*maxlsn, pagelsn) with (*maxlsn < pagelsn).

Muhammad, Can you verify if every thing is okay, then this can be marked as "Ready for Committer"

With Regards,

Amit Kapila.