greenplumn genericdesc 源码
greenplumn genericdesc 代码
文件路径：/src/backend/access/rmgrdesc/genericdesc.c
/*-------------------------------------------------------------------------
*
* genericdesc.c
* rmgr descriptor routines for access/transam/generic_xlog.c
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/backend/access/rmgrdesc/genericdesc.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/generic_xlog.h"
#include "lib/stringinfo.h"
#include "storage/relfilenode.h"
/*
* Description of generic xlog record: write page regions that this record
* overrides.
*/
void
generic_desc(StringInfo buf, XLogReaderState *record)
{
Pointer ptr = XLogRecGetData(record),
end = ptr + XLogRecGetDataLen(record);
while (ptr < end)
{
OffsetNumber offset,
length;
memcpy(&offset, ptr, sizeof(offset));
ptr += sizeof(offset);
memcpy(&length, ptr, sizeof(length));
ptr += sizeof(length);
ptr += length;
if (ptr < end)
appendStringInfo(buf, "offset %u, length %u; ", offset, length);
else
appendStringInfo(buf, "offset %u, length %u", offset, length);
}
return;
}
/*
* Identification of generic xlog record: we don't distinguish any subtypes
* inside generic xlog records.
*/
const char *
generic_identify(uint8 info)
{
return "Generic";
}
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