greenplumn cdbappendonlystorage 源码
greenplumn cdbappendonlystorage 代码
文件路径：/src/include/cdb/cdbappendonlystorage.h
/*-------------------------------------------------------------------------
*
* cdbappendonlystorage.h
*
* Portions Copyright (c) 2007-2009, Greenplum inc
* Portions Copyright (c) 2012-Present VMware, Inc. or its affiliates.
*
*
* IDENTIFICATION
* src/include/cdb/cdbappendonlystorage.h
*
*-------------------------------------------------------------------------
*/
#ifndef CDBAPPENDONLYSTORAGE_H
#define CDBAPPENDONLYSTORAGE_H
#include "catalog/pg_appendonly.h"
#include "utils/pg_crc.h"
/*
* Small Content.
*/
#define AOSmallContentHeader_MaxRowCount 0x3FFF
// 14 bits, or 16,383 (16k-1).
// Maximum row count for small content.
/*
* Non-Bulk Dense Content.
*/
#define AONonBulkDenseContentHeader_MaxLargeRowCount 0x3FFFFFFF
// 30 bits, or 1,073,741,823, or (2^30-1)
// Maximum row count for dense content.
/*
* Rounding up and padding.
*/
#define AOStorage_RoundUp4(l) ((((l)+3)/4)*4) /* 32-bit alignment */
#define AOStorage_RoundUp8(l) ((((l)+7)/8)*8) /* 64-bit alignment */
#define AOStorage_RoundUp(l, version) \
((IsAOBlockAndMemtupleAlignmentFixed(version)) ? (AOStorage_RoundUp8(l)) : (AOStorage_RoundUp4(l)))
#define AOStorage_ZeroPad(\
buf,\
len,\
padToLen)\
{\
int b;\
\
for (b = len; b < padToLen; b++)\
buf[b] = 0;\
}
/*
* Header kinds.
*/
typedef enum AoHeaderKind
{
AoHeaderKind_None = 0,
AoHeaderKind_SmallContent = 1,
AoHeaderKind_LargeContent = 2,
AoHeaderKind_NonBulkDenseContent = 3,
AoHeaderKind_BulkDenseContent = 4,
MaxAoHeaderKind /* must always be last */
} AoHeaderKind;
#define AoHeader_RegularSize 8
#define AoHeader_LongSize 16
/*
* Test if the header is regular or long size.
*/
inline static bool AoHeader_IsLong(AoHeaderKind aoHeaderKind)
{
switch (aoHeaderKind)
{
case AoHeaderKind_SmallContent:
return false;
case AoHeaderKind_LargeContent:
return false;
case AoHeaderKind_NonBulkDenseContent:
return false;
case AoHeaderKind_BulkDenseContent:
return true;
default:
elog(ERROR, "Unexpected Append-Only header kind %d",
aoHeaderKind);
return false; // Never reaches here.
}
}
inline static int32 AoHeader_Size(
bool isLong,
bool hasChecksums,
bool hasFirstRowNum)
{
int32 headerLen;
headerLen = (isLong ? AoHeader_LongSize : AoHeader_RegularSize);
if (hasChecksums)
{
headerLen += 2 * sizeof(pg_crc32);
}
if (hasFirstRowNum)
{
headerLen += sizeof(int64);
}
return headerLen;
}
/*
* Header check errors.
*/
typedef enum AOHeaderCheckError
{
AOHeaderCheckOk = 0,
AOHeaderCheckFirst32BitsAllZeroes,
AOHeaderCheckReservedBit0Not0,
AOHeaderCheckInvalidHeaderKindNone,
AOHeaderCheckInvalidHeaderKind,
AOHeaderCheck__OBSOLETE_,
AOHeaderCheckInvalidCompressedLen,
AOHeaderCheckInvalidOverallBlockLen,
AOHeaderCheckLargeContentLenIsZero,
} AOHeaderCheckError;
#endif /* CDBAPPENDONLYSTORAGE_H */
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