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data and bitmap compress/store/decompress separatedly

This commit is contained in:
Cary Xu 2022-04-03 18:02:30 +08:00
parent ca3206d45e
commit b3bb652708
8 changed files with 120 additions and 59 deletions
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5
include/common/tdataformat.h
View File

@ -135,8 +135,8 @@ typedef struct {
#define TD_VTYPE_PARTS 4 // 8 bits / TD_VTYPE_BITS = 4
#define TD_VTYPE_OPTR 3 // TD_VTYPE_PARTS - 1, utilize to get remainder
#define TD_BITMAP_BYTES(cnt) (ceil((double)cnt / TD_VTYPE_PARTS))
#define TD_BIT_TO_BYTES(cnt) (ceil((double)cnt / 8))
#define TD_BITMAP_BYTES(cnt) (ceil((double)(cnt) / TD_VTYPE_PARTS))
#define TD_BIT_TO_BYTES(cnt) (ceil((double)(cnt) / 8))
int32_t tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, schema_ver_t version);
void tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder);
@ -365,6 +365,7 @@ static FORCE_INLINE void tdCopyColOfRowBySchema(SDataRow dst, STSchema *pDstSche
}
#endif
// ----------------- Data column structure
// SDataCol arrangement: data => bitmap => dataOffset
typedef struct SDataCol {
int8_t type; // column type
uint8_t bitmap : 1; // 0: has bitmap if has NULL/NORM rows, 1: no bitmap if all rows are NORM

28
include/common/trow.h
View File

@ -147,20 +147,20 @@ typedef struct {
typedef struct {
// basic info
int8_t rowType;
int16_t sver;
STSRow *pBuf;
int8_t rowType;
schema_ver_t sver;
STSRow *pBuf;
// extended info
int32_t flen;
int16_t nBoundCols;
int16_t nCols;
int16_t nBitmaps;
int16_t nBoundBitmaps;
int32_t offset;
void *pBitmap;
void *pOffset;
int32_t extendedRowSize;
int32_t flen;
col_id_t nBoundCols;
col_id_t nCols;
col_id_t nBitmaps;
col_id_t nBoundBitmaps;
int32_t offset;
void *pBitmap;
void *pOffset;
int32_t extendedRowSize;
} SRowBuilder;
#define TD_ROW_HEAD_LEN (sizeof(STSRow))
@ -448,9 +448,9 @@ static FORCE_INLINE int32_t tdSRowSetExtendedInfo(SRowBuilder *pBuilder, int32_t
}
#ifdef TD_SUPPORT_BITMAP
// the primary TS key is stored separatedly
pBuilder->nBitmaps = (int16_t)TD_BITMAP_BYTES(pBuilder->nCols - 1);
pBuilder->nBitmaps = (col_id_t)TD_BITMAP_BYTES(pBuilder->nCols - 1);
if (nBoundCols > 0) {
pBuilder->nBoundBitmaps = (int16_t)TD_BITMAP_BYTES(pBuilder->nBoundCols - 1);
pBuilder->nBoundBitmaps = (col_id_t)TD_BITMAP_BYTES(pBuilder->nBoundCols - 1);
} else {
pBuilder->nBoundBitmaps = 0;
}

26
source/common/src/tdataformat.c
View File

@ -33,7 +33,8 @@ int tdAllocMemForCol(SDataCol *pCol, int maxPoints) {
spaceNeeded += (int)nBitmapBytes;
// TODO: Currently, the compression of bitmap parts is affiliated to the column data parts, thus allocate 1 more
// TYPE_BYTES as to comprise complete TYPE_BYTES. Otherwise, invalid read/write would be triggered.
spaceNeeded += TYPE_BYTES[pCol->type];
// spaceNeeded += TYPE_BYTES[pCol->type]; // the bitmap part is append as a single part since 2022.04.03, thus remove
// the additional space
#endif
if (pCol->spaceSize < spaceNeeded) {
@ -47,6 +48,7 @@ int tdAllocMemForCol(SDataCol *pCol, int maxPoints) {
}
}
#ifdef TD_SUPPORT_BITMAP
if (IS_VAR_DATA_TYPE(pCol->type)) {
pCol->pBitmap = POINTER_SHIFT(pCol->pData, pCol->bytes * maxPoints);
pCol->dataOff = POINTER_SHIFT(pCol->pBitmap, nBitmapBytes);
@ -306,7 +308,7 @@ static FORCE_INLINE const void *tdGetColDataOfRowUnsafe(SDataCol *pCol, int row)
bool isNEleNull(SDataCol *pCol, int nEle) {
if (isAllRowsNull(pCol)) return true;
for (int i = 0; i < nEle; i++) {
for (int i = 0; i < nEle; ++i) {
if (!isNull(tdGetColDataOfRowUnsafe(pCol, i), pCol->type)) return false;
}
return true;
@ -327,7 +329,7 @@ static FORCE_INLINE void dataColSetNullAt(SDataCol *pCol, int index) {
static void dataColSetNEleNull(SDataCol *pCol, int nEle) {
if (IS_VAR_DATA_TYPE(pCol->type)) {
pCol->len = 0;
for (int i = 0; i < nEle; i++) {
for (int i = 0; i < nEle; ++i) {
dataColSetNullAt(pCol, i);
}
} else {
@ -343,7 +345,7 @@ void *dataColSetOffset(SDataCol *pCol, int nEle) {
// char *tptr = (char *)(pCol->pData);
VarDataOffsetT offset = 0;
for (int i = 0; i < nEle; i++) {
for (int i = 0; i < nEle; ++i) {
pCol->dataOff[i] = offset;
offset += varDataTLen(tptr);
tptr = POINTER_SHIFT(tptr, varDataTLen(tptr));
@ -371,6 +373,7 @@ SDataCols *tdNewDataCols(int maxCols, int maxRows) {
tdFreeDataCols(pCols);
return NULL;
}
#if 0 // no need as calloc used
int i;
for (i = 0; i < maxCols; i++) {
pCols->cols[i].spaceSize = 0;
@ -378,6 +381,7 @@ SDataCols *tdNewDataCols(int maxCols, int maxRows) {
pCols->cols[i].pData = NULL;
pCols->cols[i].dataOff = NULL;
}
#endif
}
return pCols;
@ -391,17 +395,21 @@ int tdInitDataCols(SDataCols *pCols, STSchema *pSchema) {
void *ptr = (SDataCol *)taosMemoryRealloc(pCols->cols, sizeof(SDataCol) * pCols->maxCols);
if (ptr == NULL) return -1;
pCols->cols = ptr;
for (i = oldMaxCols; i < pCols->maxCols; i++) {
for (i = oldMaxCols; i < pCols->maxCols; ++i) {
pCols->cols[i].pData = NULL;
pCols->cols[i].dataOff = NULL;
pCols->cols[i].pBitmap = NULL;
pCols->cols[i].spaceSize = 0;
}
}
#if 0
tdResetDataCols(pCols); // redundant loop to reset len/blen to 0, already reset in following dataColInit(...)
#endif
tdResetDataCols(pCols);
pCols->numOfRows = 0;
pCols->numOfCols = schemaNCols(pSchema);
for (i = 0; i < schemaNCols(pSchema); i++) {
for (i = 0; i < schemaNCols(pSchema); ++i) {
dataColInit(pCols->cols + i, schemaColAt(pSchema, i), pCols->maxPoints);
}
@ -413,7 +421,7 @@ SDataCols *tdFreeDataCols(SDataCols *pCols) {
if (pCols) {
if (pCols->cols) {
int maxCols = pCols->maxCols;
for (i = 0; i < maxCols; i++) {
for (i = 0; i < maxCols; ++i) {
SDataCol *pCol = &pCols->cols[i];
taosMemoryFreeClear(pCol->pData);
}
@ -464,7 +472,7 @@ SDataCols *tdDupDataCols(SDataCols *pDataCols, bool keepData) {
void tdResetDataCols(SDataCols *pCols) {
if (pCols != NULL) {
pCols->numOfRows = 0;
for (int i = 0; i < pCols->maxCols; i++) {
for (int i = 0; i < pCols->maxCols; ++i) {
dataColReset(pCols->cols + i);
}
}

2
source/common/src/trow.c
View File

@ -503,7 +503,7 @@ SDataCols *tdDupDataCols(SDataCols *pDataCols, bool keepData) {
memcpy(pRet->cols[i].dataOff, pDataCols->cols[i].dataOff, dataOffSize);
}
if (!TD_COL_ROWS_NORM(pRet->cols + i)) {
int32_t nBitmapBytes = (int32_t)TD_BITMAP_BYTES(pDataCols->maxPoints);
int32_t nBitmapBytes = (int32_t)TD_BITMAP_BYTES(pDataCols->numOfRows);
memcpy(pRet->cols[i].pBitmap, pDataCols->cols[i].pBitmap, nBitmapBytes);
}
}

8
source/dnode/vnode/src/inc/tsdbReadImpl.h
View File

@ -112,10 +112,10 @@ typedef struct {
#else
typedef struct {
int16_t colId;
uint8_t bitmap : 1; // 0: has bitmap if has NULL/NORM rows, 1: no bitmap if all rows are NORM
uint8_t reserve : 7;
uint8_t type;
int32_t len;
uint16_t type : 6;
uint16_t blen : 10; // bitmap length(TODO: full UT for the bitmap compress of various data input)
uint32_t bitmap : 1; // 0: has bitmap if has NULL/NORM rows, 1: no bitmap if all rows are NORM
uint32_t len : 31; // data length + bitmap length
uint32_t offset;
} SBlockColV0;

33
source/dnode/vnode/src/tsdb/tsdbCommit.c
View File

@ -1281,7 +1281,7 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
uint32_t tsizeAggr = (uint32_t)tsdbBlockAggrSize(nColsNotAllNull, SBlockVerLatest);
int32_t keyLen = 0;
int32_t nBitmaps = (int32_t)TD_BITMAP_BYTES(rowsToWrite);
int32_t tBitmaps = 0;
// int32_t tBitmaps = 0;
for (int ncol = 0; ncol < pDataCols->numOfCols; ++ncol) {
// All not NULL columns finish
@ -1297,7 +1297,10 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
#ifdef TD_SUPPORT_BITMAP
int32_t tBitmaps = 0;
int32_t tBitmapsLen = 0;
if ((ncol != 0) && !TD_COL_ROWS_NORM(pBlockCol)) {
tBitmaps = nBitmaps;
#if 0
if (IS_VAR_DATA_TYPE(pDataCol->type)) {
tBitmaps = nBitmaps;
tlen += tBitmaps;
@ -1305,16 +1308,17 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
tBitmaps = (int32_t)ceil((double)nBitmaps / TYPE_BYTES[pDataCol->type]);
tlen += tBitmaps * TYPE_BYTES[pDataCol->type];
}
#endif
// move bitmap parts ahead
// TODO: put bitmap part to the 1st location(pBitmap points to pData) to avoid the memmove
memcpy(POINTER_SHIFT(pDataCol->pData, pDataCol->len), pDataCol->pBitmap, nBitmaps);
// memcpy(POINTER_SHIFT(pDataCol->pData, pDataCol->len), pDataCol->pBitmap, nBitmaps);
}
#endif
void *tptr;
// Make room
if (tsdbMakeRoom(ppBuf, lsize + tlen + COMP_OVERFLOW_BYTES + sizeof(TSCKSUM)) < 0) {
if (tsdbMakeRoom(ppBuf, lsize + tlen + tBitmaps + 2 * COMP_OVERFLOW_BYTES + sizeof(TSCKSUM)) < 0) {
return -1;
}
pBlockData = (SBlockData *)(*ppBuf);
@ -1327,23 +1331,44 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
// Compress or just copy
if (pCfg->compression) {
#if 0
flen = (*(tDataTypes[pDataCol->type].compFunc))((char *)pDataCol->pData, tlen, rowsToWrite + tBitmaps, tptr,
tlen + COMP_OVERFLOW_BYTES, pCfg->compression, *ppCBuf,
tlen + COMP_OVERFLOW_BYTES);
#endif
flen = (*(tDataTypes[pDataCol->type].compFunc))((char *)pDataCol->pData, tlen, rowsToWrite, tptr,
tlen + COMP_OVERFLOW_BYTES, pCfg->compression, *ppCBuf,
tlen + COMP_OVERFLOW_BYTES);
if (tBitmaps > 0) {
tptr = POINTER_SHIFT(pBlockData, lsize + flen);
tBitmapsLen =
tsCompressTinyint((char *)pDataCol->pBitmap, tBitmaps, rowsToWrite, tptr, tBitmaps + COMP_OVERFLOW_BYTES,
pCfg->compression, *ppCBuf, tBitmaps + COMP_OVERFLOW_BYTES);
TASSERT((tBitmapsLen > 0) && (tBitmapsLen <= (tBitmaps + COMP_OVERFLOW_BYTES)));
flen += tBitmapsLen;
}
} else {
flen = tlen;
memcpy(tptr, pDataCol->pData, flen);
if (tBitmaps > 0) {
tptr = POINTER_SHIFT(pBlockData, lsize + flen);
memcpy(tptr, pDataCol->pBitmap, tBitmaps);
tBitmapsLen = tBitmaps;
flen += tBitmapsLen;
}
}
// Add checksum
ASSERT(flen > 0);
ASSERT(tBitmapsLen <= 1024);
flen += sizeof(TSCKSUM);
taosCalcChecksumAppend(0, (uint8_t *)tptr, flen);
tsdbUpdateDFileMagic(pDFile, POINTER_SHIFT(tptr, flen - sizeof(TSCKSUM)));
if (ncol != 0) {
tsdbSetBlockColOffset(pBlockCol, toffset);
pBlockCol->len = flen;
pBlockCol->len = flen; // data + bitmaps
pBlockCol->blen = tBitmapsLen;
++tcol;
} else {
keyLen = flen;

73
source/dnode/vnode/src/tsdb/tsdbReadImpl.c
View File

@ -21,9 +21,8 @@ static void tsdbResetReadTable(SReadH *pReadh);
static void tsdbResetReadFile(SReadH *pReadh);
static int tsdbLoadBlockOffset(SReadH *pReadh, SBlock *pBlock);
static int tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDataCols);
static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32_t len, int8_t comp, int numOfRows,
int numOfBitmaps, int lenOfBitmaps, int maxPoints, char *buffer,
int bufferSize);
static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32_t len, int32_t bitmapLen, int8_t comp,
int numOfRows, int numOfBitmaps, int maxPoints, char *buffer, int bufferSize);
static int tsdbLoadBlockDataColsImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDataCols, const int16_t *colIds,
int numOfColIds);
static int tsdbLoadColData(SReadH *pReadh, SDFile *pDFile, SBlock *pBlock, SBlockCol *pBlockCol, SDataCol *pDataCol);
@ -548,7 +547,7 @@ static int tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDat
if (dcol != 0 && ccol >= pBlockData->numOfCols) {
// Set current column as NULL and forward
dataColReset(pDataCol);
dcol++;
++dcol;
continue;
}
@ -567,9 +566,11 @@ static int tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDat
TD_SET_COL_ROWS_NORM(pDataCol);
}
int32_t tBitmaps = 0;
// int32_t tBitmaps = 0;
int32_t tLenBitmap = 0;
if ((dcol != 0) && !TD_COL_ROWS_NORM(pBlockCol)) {
tLenBitmap = nBitmaps;
#if 0
if (IS_VAR_DATA_TYPE(pDataCol->type)) {
tBitmaps = nBitmaps;
tLenBitmap = tBitmaps;
@ -577,17 +578,18 @@ static int tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDat
tBitmaps = (int32_t)ceil((double)nBitmaps / TYPE_BYTES[pDataCol->type]);
tLenBitmap = tBitmaps * TYPE_BYTES[pDataCol->type];
}
#endif
}
if (tcolId == pDataCol->colId) {
if (pBlock->algorithm == TWO_STAGE_COMP) {
int zsize = pDataCol->bytes * pBlock->numOfRows + COMP_OVERFLOW_BYTES;
int zsize = pDataCol->bytes * pBlock->numOfRows + tLenBitmap + 2 * COMP_OVERFLOW_BYTES;
if (tsdbMakeRoom((void **)(&TSDB_READ_COMP_BUF(pReadh)), zsize) < 0) return -1;
}
if (tsdbCheckAndDecodeColumnData(pDataCol, POINTER_SHIFT(pBlockData, tsize + toffset), tlen, pBlock->algorithm,
pBlock->numOfRows, tBitmaps, tLenBitmap, pDataCols->maxPoints, TSDB_READ_COMP_BUF(pReadh),
(int)taosTSizeof(TSDB_READ_COMP_BUF(pReadh))) < 0) {
if (tsdbCheckAndDecodeColumnData(pDataCol, POINTER_SHIFT(pBlockData, tsize + toffset), tlen, pBlockCol->blen,
pBlock->algorithm, pBlock->numOfRows, tLenBitmap, pDataCols->maxPoints,
TSDB_READ_COMP_BUF(pReadh), (int)taosTSizeof(TSDB_READ_COMP_BUF(pReadh))) < 0) {
tsdbError("vgId:%d file %s is broken at column %d block offset %" PRId64 " column offset %u",
TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFile), tcolId, (int64_t)pBlock->offset, toffset);
return -1;
@ -609,9 +611,8 @@ static int tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDat
return 0;
}
static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32_t len, int8_t comp, int numOfRows,
int numOfBitmaps, int lenOfBitmaps, int maxPoints, char *buffer,
int bufferSize) {
static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32_t len, int32_t bitmapLen, int8_t comp,
int numOfRows, int numOfBitmaps, int maxPoints, char *buffer, int bufferSize) {
if (!taosCheckChecksumWhole((uint8_t *)content, len)) {
terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
return -1;
@ -623,21 +624,41 @@ static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32
if (comp) {
// Need to decompress
int tlen =
(*(tDataTypes[pDataCol->type].decompFunc))(content, len - sizeof(TSCKSUM), numOfRows + numOfBitmaps,
(*(tDataTypes[pDataCol->type].decompFunc))(content, len - bitmapLen - sizeof(TSCKSUM), numOfRows,
pDataCol->pData, pDataCol->spaceSize, comp, buffer, bufferSize);
if (tlen <= 0) {
tsdbError("Failed to decompress column, file corrupted, len:%d comp:%d numOfRows:%d maxPoints:%d bufferSize:%d",
len, comp, numOfRows, maxPoints, bufferSize);
tsdbError(
"Failed to decompress column data, file corrupted, len:%d comp:%d numOfRows:%d maxPoints:%d bufferSize:%d",
(int32_t)(len - bitmapLen - sizeof(TSCKSUM)), comp, numOfRows, maxPoints, bufferSize);
terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
return -1;
}
pDataCol->len = tlen;
if (numOfBitmaps > 0) {
tlen = tsDecompressTinyint(POINTER_SHIFT(content, len - bitmapLen - sizeof(TSCKSUM)), bitmapLen, numOfBitmaps,
pDataCol->pBitmap, pDataCol->spaceSize, comp, buffer, bufferSize);
if (tlen <= 0) {
tsdbError(
"Failed to decompress column bitmap, file corrupted, len:%d comp:%d numOfRows:%d maxPoints:%d "
"bufferSize:%d",
bitmapLen, comp, numOfBitmaps, maxPoints, bufferSize);
terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
return -1;
}
// pDataCol->blen = tlen;
}
} else {
// No need to decompress, just memcpy it
pDataCol->len = len - sizeof(TSCKSUM);
pDataCol->len = len - bitmapLen - sizeof(TSCKSUM);
memcpy(pDataCol->pData, content, pDataCol->len);
if (numOfBitmaps > 0) {
// pDataCol->blen = bitmapLen;
memcpy(pDataCol->pBitmap, POINTER_SHIFT(content, len - bitmapLen - sizeof(TSCKSUM)), bitmapLen);
}
}
#if 0
if (lenOfBitmaps > 0) {
pDataCol->len -= lenOfBitmaps;
@ -653,7 +674,10 @@ static int tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32
} else if (IS_VAR_DATA_TYPE(pDataCol->type)) {
dataColSetOffset(pDataCol, numOfRows);
}
#endif
if (IS_VAR_DATA_TYPE(pDataCol->type)) {
dataColSetOffset(pDataCol, numOfRows);
}
return 0;
}
@ -740,14 +764,16 @@ static int tsdbLoadBlockDataColsImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *
static int tsdbLoadColData(SReadH *pReadh, SDFile *pDFile, SBlock *pBlock, SBlockCol *pBlockCol, SDataCol *pDataCol) {
ASSERT(pDataCol->colId == pBlockCol->colId);
STsdb * pRepo = TSDB_READ_REPO(pReadh);
STsdb *pRepo = TSDB_READ_REPO(pReadh);
STsdbCfg *pCfg = REPO_CFG(pRepo);
int nBitmaps = (int)TD_BITMAP_BYTES(pBlock->numOfRows);
int32_t tBitmaps = 0;
int nBitmaps = (int)TD_BITMAP_BYTES(pBlock->numOfRows);
// int32_t tBitmaps = 0;
int32_t tLenBitmap = 0;
if (!TD_COL_ROWS_NORM(pBlockCol)) {
tLenBitmap = nBitmaps;
#if 0
if (IS_VAR_DATA_TYPE(pDataCol->type)) {
tBitmaps = nBitmaps;
tLenBitmap = tBitmaps;
@ -755,9 +781,10 @@ static int tsdbLoadColData(SReadH *pReadh, SDFile *pDFile, SBlock *pBlock, SBloc
tBitmaps = (int32_t)ceil((double)nBitmaps / TYPE_BYTES[pDataCol->type]);
tLenBitmap = tBitmaps * TYPE_BYTES[pDataCol->type];
}
#endif
}
int tsize = pDataCol->bytes * pBlock->numOfRows + tLenBitmap + COMP_OVERFLOW_BYTES;
int tsize = pDataCol->bytes * pBlock->numOfRows + tLenBitmap + 2 * COMP_OVERFLOW_BYTES;
if (tsdbMakeRoom((void **)(&TSDB_READ_BUF(pReadh)), pBlockCol->len) < 0) return -1;
if (tsdbMakeRoom((void **)(&TSDB_READ_COMP_BUF(pReadh)), tsize) < 0) return -1;
@ -785,8 +812,8 @@ static int tsdbLoadColData(SReadH *pReadh, SDFile *pDFile, SBlock *pBlock, SBloc
return -1;
}
if (tsdbCheckAndDecodeColumnData(pDataCol, pReadh->pBuf, pBlockCol->len, pBlock->algorithm, pBlock->numOfRows,
tBitmaps, tLenBitmap, pCfg->maxRowsPerFileBlock, pReadh->pCBuf,
if (tsdbCheckAndDecodeColumnData(pDataCol, pReadh->pBuf, pBlockCol->len, pBlockCol->blen, pBlock->algorithm,
pBlock->numOfRows, tLenBitmap, pCfg->maxRowsPerFileBlock, pReadh->pCBuf,
(int32_t)taosTSizeof(pReadh->pCBuf)) < 0) {
tsdbError("vgId:%d file %s is broken at column %d offset %" PRId64, REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pDFile),
pBlockCol->colId, offset);

4
source/util/src/tcompression.c
View File

@ -28,11 +28,11 @@
*
* BOOLEAN Compression Algorithm:
* We provide two methods for compress boolean types. Because boolean types in C
* code are char bytes with 0 and 1 values only, only one bit can used to discrimenate
* code are char bytes with 0 and 1 values only, only one bit can used to discriminate
* the values.
* 1. The first method is using only 1 bit to represent the boolean value with 1 for
* true and 0 for false. Then the compression rate is 1/8.
* 2. The second method is using run length encoding (RLE) methods. This methos works
* 2. The second method is using run length encoding (RLE) methods. This method works
* better when there are a lot of consecutive true values or false values.
*
* STRING Compression Algorithm: