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Fix description of WAL record XLOG_BTREE_META_CLEANUP

This record uses one metadata buffer and registers some data associatedto the buffer, but when parsing the record for its description a directaccess to the record data was done, but there is none. This leadsusually to an incorrect description, but can also cause crashes like inpg_waldump. Instead, fix things so as the parsing uses the dataassociated to the metadata block.This is an oversight from3d92796, so backpatch down to 11.Author: Michael PaquierDescription:https://postgr.es/m/20190617013059.GA3153@paquier.xyzBackpatch-through: 11

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src/backend/access/rmgrdesc
- nbtdesc.c

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`‎src/backend/access/rmgrdesc/nbtdesc.c`

Lines changed: 3 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -97,8 +97,10 @@ btree_desc(StringInfo buf, XLogReaderState *record)`
`97`	`97`	`}`
`98`	`98`	`caseXLOG_BTREE_META_CLEANUP:`
`99`	`99`	`{`
`100`		`-xl_btree_metadataxlrec= (xl_btree_metadata)rec;`
	`100`	`+xl_btree_metadata*xlrec;`
`101`	`101`
	`102`	`+xlrec= (xl_btree_metadata*)XLogRecGetBlockData(record,0,`
	`103`	`+NULL);`
`102`	`104`	`appendStringInfo(buf,"oldest_btpo_xact %u; last_cleanup_num_heap_tuples: %f",`
`103`	`105`	`xlrec->oldest_btpo_xact,`
`104`	`106`	`xlrec->last_cleanup_num_heap_tuples);`

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Commit3c28fd2

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`‎src/backend/access/rmgrdesc/nbtdesc.c`

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