Hi, I have a small question for those involved:
Context: I'm trying to get the smallest BKPIMAGE size possible regardless of CPU cost, which means I'm trying multiple compressions to get the smallest data possible with the options available. This means ignoring the wal_compression GUC in XLogCompressBackupBlock and brute-forcing the smallest compression available, potentially layering compression methods, and returning the bimg_info compression flags that will be stored in XLogCompressBackupBlock and used to decompress the block's data. Is there a prescribed order of compression algorithms to apply when (de)compressing full page images in WAL, when the bimg_info has more than one BKPIMAGE_COMPRESS_*-flags set? That is, when I want to check the compression of the block image with both ZSTD and LZ4, which order is the ordering indicated by bimg_info = (COMPRESS_LZ4 | COMPRESS_ZSTD)? Kind regards, Matthias van de Meent
