Please find attached  a patch. As discussed, flag to denote compression and 
presence of hole in block image has been added in XLogRecordImageHeader rather 
than block header.  

Following are WAL numbers based on attached  test script  posted by Michael 
earlier in the thread.
                                                      WAL generated
FPW compression on           122.032 MB

FPW compression off           155.223 MB

HEAD                                          155.236 MB 

Compression : 21 %
Number of block images generated in WAL :   63637

Thank you,
Rahila Syed

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Attachment: Support-compression-of-full-page-writes-in-WAL_v23.patch
Description: Support-compression-of-full-page-writes-in-WAL_v23.patch

Attachment: compress_run.bash
Description: compress_run.bash

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