未验证 提交 4bad58c1 编写于 作者: C Cary Xu 提交者: GitHub

Merge pull request #11067 from taosdata/feature/TD-11463-3.0

Feature/td 11463 3.0
...@@ -63,7 +63,7 @@ extern "C" { ...@@ -63,7 +63,7 @@ extern "C" {
typedef struct { typedef struct {
col_id_t colId; // column ID(start from PRIMARYKEY_TIMESTAMP_COL_ID(1)) col_id_t colId; // column ID(start from PRIMARYKEY_TIMESTAMP_COL_ID(1))
int32_t type : 8; // column type int32_t type : 8; // column type
int32_t bytes : 24; // column bytes (restore to int32_t in case of misuse) int32_t bytes : 24; // column bytes (0~16M)
int32_t sma : 8; // block SMA: 0, no SMA, 1, sum/min/max, 2, ... int32_t sma : 8; // block SMA: 0, no SMA, 1, sum/min/max, 2, ...
int32_t offset : 24; // point offset in STpRow after the header part. int32_t offset : 24; // point offset in STpRow after the header part.
} STColumn; } STColumn;
...@@ -81,12 +81,12 @@ typedef struct { ...@@ -81,12 +81,12 @@ typedef struct {
// ----------------- TSDB SCHEMA DEFINITION // ----------------- TSDB SCHEMA DEFINITION
typedef struct { typedef struct {
int32_t version; // version int32_t numOfCols; // Number of columns appended
int32_t numOfCols; // Number of columns appended schema_ver_t version; // schema version
int32_t tlen; // maximum length of a STpRow without the header part (sizeof(VarDataOffsetT) + sizeof(VarDataLenT) + uint16_t flen; // First part length in a STpRow after the header part
// (bytes)) int32_t vlen; // pure value part length, excluded the overhead (bytes only)
uint16_t flen; // First part length in a STpRow after the header part int32_t tlen; // maximum length of a STpRow without the header part
uint16_t vlen; // pure value part length, excluded the overhead (bytes only) // (sizeof(VarDataOffsetT) + sizeof(VarDataLenT) + (bytes))
STColumn columns[]; STColumn columns[];
} STSchema; } STSchema;
...@@ -120,13 +120,13 @@ static FORCE_INLINE STColumn *tdGetColOfID(STSchema *pSchema, int16_t colId) { ...@@ -120,13 +120,13 @@ static FORCE_INLINE STColumn *tdGetColOfID(STSchema *pSchema, int16_t colId) {
// ----------------- SCHEMA BUILDER DEFINITION // ----------------- SCHEMA BUILDER DEFINITION
typedef struct { typedef struct {
int32_t tCols; int32_t tCols;
int32_t nCols; int32_t nCols;
int32_t tlen; schema_ver_t version;
uint16_t flen; uint16_t flen;
uint16_t vlen; int32_t vlen;
int32_t version; int32_t tlen;
STColumn *columns; STColumn *columns;
} STSchemaBuilder; } STSchemaBuilder;
#define TD_VTYPE_BITS 2 // val type #define TD_VTYPE_BITS 2 // val type
...@@ -136,9 +136,9 @@ typedef struct { ...@@ -136,9 +136,9 @@ typedef struct {
#define TD_BITMAP_BYTES(cnt) (ceil((double)cnt / TD_VTYPE_PARTS)) #define TD_BITMAP_BYTES(cnt) (ceil((double)cnt / TD_VTYPE_PARTS))
#define TD_BIT_TO_BYTES(cnt) (ceil((double)cnt / 8)) #define TD_BIT_TO_BYTES(cnt) (ceil((double)cnt / 8))
int32_t tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version); int32_t tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, schema_ver_t version);
void tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder); void tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder);
void tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version); void tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, schema_ver_t version);
int32_t tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, col_id_t colId, col_bytes_t bytes); int32_t tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, col_id_t colId, col_bytes_t bytes);
STSchema *tdGetSchemaFromBuilder(STSchemaBuilder *pBuilder); STSchema *tdGetSchemaFromBuilder(STSchemaBuilder *pBuilder);
......
...@@ -30,6 +30,7 @@ typedef uint8_t TDRowValT; ...@@ -30,6 +30,7 @@ typedef uint8_t TDRowValT;
typedef int16_t col_id_t; typedef int16_t col_id_t;
typedef int8_t col_type_t; typedef int8_t col_type_t;
typedef int32_t col_bytes_t; typedef int32_t col_bytes_t;
typedef uint16_t schema_ver_t;
#pragma pack(push, 1) #pragma pack(push, 1)
typedef struct { typedef struct {
......
...@@ -123,7 +123,7 @@ void *tdDecodeSchema(void *buf, STSchema **pRSchema) { ...@@ -123,7 +123,7 @@ void *tdDecodeSchema(void *buf, STSchema **pRSchema) {
return buf; return buf;
} }
int tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version) { int tdInitTSchemaBuilder(STSchemaBuilder *pBuilder, schema_ver_t version) {
if (pBuilder == NULL) return -1; if (pBuilder == NULL) return -1;
pBuilder->tCols = 256; pBuilder->tCols = 256;
...@@ -140,7 +140,7 @@ void tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder) { ...@@ -140,7 +140,7 @@ void tdDestroyTSchemaBuilder(STSchemaBuilder *pBuilder) {
} }
} }
void tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, int32_t version) { void tdResetTSchemaBuilder(STSchemaBuilder *pBuilder, schema_ver_t version) {
pBuilder->nCols = 0; pBuilder->nCols = 0;
pBuilder->tlen = 0; pBuilder->tlen = 0;
pBuilder->flen = 0; pBuilder->flen = 0;
...@@ -168,6 +168,9 @@ int tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, col_id_t colId, col ...@@ -168,6 +168,9 @@ int tdAddColToSchema(STSchemaBuilder *pBuilder, int8_t type, col_id_t colId, col
colSetOffset(pCol, pTCol->offset + TYPE_BYTES[pTCol->type]); colSetOffset(pCol, pTCol->offset + TYPE_BYTES[pTCol->type]);
} }
// TODO: set sma value by user input
pCol->sma = 1;
if (IS_VAR_DATA_TYPE(type)) { if (IS_VAR_DATA_TYPE(type)) {
colSetBytes(pCol, bytes); colSetBytes(pCol, bytes);
pBuilder->tlen += (TYPE_BYTES[type] + bytes); pBuilder->tlen += (TYPE_BYTES[type] + bytes);
......
...@@ -67,12 +67,13 @@ typedef struct { ...@@ -67,12 +67,13 @@ typedef struct {
uint8_t last : 1; uint8_t last : 1;
uint8_t blkVer : 7; uint8_t blkVer : 7;
uint8_t numOfSubBlocks; uint8_t numOfSubBlocks;
int16_t numOfCols; // not including timestamp column col_id_t numOfCols; // not including timestamp column
uint32_t len; // data block length uint32_t len; // data block length
uint32_t keyLen : 24; // key column length, keyOffset = offset+sizeof(SBlockData)+sizeof(SBlockCol)*numOfCols uint32_t keyLen : 20; // key column length, keyOffset = offset+sizeof(SBlockData)+sizeof(SBlockCol)*numOfCols
uint32_t algorithm : 4;
uint32_t reserve : 8; uint32_t reserve : 8;
int32_t algorithm : 8; col_id_t numOfBSma;
int32_t numOfRows : 24; uint16_t numOfRows;
int64_t offset; int64_t offset;
uint64_t aggrStat : 1; uint64_t aggrStat : 1;
uint64_t aggrOffset : 63; uint64_t aggrOffset : 63;
...@@ -80,7 +81,7 @@ typedef struct { ...@@ -80,7 +81,7 @@ typedef struct {
TSKEY keyLast; TSKEY keyLast;
} SBlockV0; } SBlockV0;
#define SBlock SBlockV0 // latest SBlock definition #define SBlock SBlockV0 // latest SBlock definition
#endif #endif
......
...@@ -43,20 +43,20 @@ typedef struct { ...@@ -43,20 +43,20 @@ typedef struct {
#define TSDB_DEFAULT_BLOCK_ROWS(maxRows) ((maxRows)*4 / 5) #define TSDB_DEFAULT_BLOCK_ROWS(maxRows) ((maxRows)*4 / 5)
#define TSDB_COMMIT_REPO(ch) TSDB_READ_REPO(&(ch->readh)) #define TSDB_COMMIT_REPO(ch) TSDB_READ_REPO(&(ch->readh))
#define TSDB_COMMIT_REPO_ID(ch) REPO_ID(TSDB_READ_REPO(&(ch->readh))) #define TSDB_COMMIT_REPO_ID(ch) REPO_ID(TSDB_READ_REPO(&(ch->readh)))
#define TSDB_COMMIT_WRITE_FSET(ch) (&((ch)->wSet)) #define TSDB_COMMIT_WRITE_FSET(ch) (&((ch)->wSet))
#define TSDB_COMMIT_TABLE(ch) ((ch)->pTable) #define TSDB_COMMIT_TABLE(ch) ((ch)->pTable)
#define TSDB_COMMIT_HEAD_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_HEAD) #define TSDB_COMMIT_HEAD_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_HEAD)
#define TSDB_COMMIT_DATA_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_DATA) #define TSDB_COMMIT_DATA_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_DATA)
#define TSDB_COMMIT_LAST_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_LAST) #define TSDB_COMMIT_LAST_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_LAST)
#define TSDB_COMMIT_SMAD_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_SMAD) #define TSDB_COMMIT_SMAD_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_SMAD)
#define TSDB_COMMIT_SMAL_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_SMAL) #define TSDB_COMMIT_SMAL_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_SMAL)
#define TSDB_COMMIT_BUF(ch) TSDB_READ_BUF(&((ch)->readh)) #define TSDB_COMMIT_BUF(ch) TSDB_READ_BUF(&((ch)->readh))
#define TSDB_COMMIT_COMP_BUF(ch) TSDB_READ_COMP_BUF(&((ch)->readh)) #define TSDB_COMMIT_COMP_BUF(ch) TSDB_READ_COMP_BUF(&((ch)->readh))
#define TSDB_COMMIT_EXBUF(ch) TSDB_READ_EXBUF(&((ch)->readh)) #define TSDB_COMMIT_EXBUF(ch) TSDB_READ_EXBUF(&((ch)->readh))
#define TSDB_COMMIT_DEFAULT_ROWS(ch) TSDB_DEFAULT_BLOCK_ROWS(TSDB_COMMIT_REPO(ch)->config.maxRowsPerFileBlock) #define TSDB_COMMIT_DEFAULT_ROWS(ch) TSDB_DEFAULT_BLOCK_ROWS(TSDB_COMMIT_REPO(ch)->config.maxRowsPerFileBlock)
#define TSDB_COMMIT_TXN_VERSION(ch) FS_TXN_VERSION(REPO_FS(TSDB_COMMIT_REPO(ch))) #define TSDB_COMMIT_TXN_VERSION(ch) FS_TXN_VERSION(REPO_FS(TSDB_COMMIT_REPO(ch)))
static void tsdbStartCommit(STsdb *pRepo); static void tsdbStartCommit(STsdb *pRepo);
static void tsdbEndCommit(STsdb *pTsdb, int eno); static void tsdbEndCommit(STsdb *pTsdb, int eno);
...@@ -1204,9 +1204,10 @@ static int tsdbComparKeyBlock(const void *arg1, const void *arg2) { ...@@ -1204,9 +1204,10 @@ static int tsdbComparKeyBlock(const void *arg1, const void *arg2) {
int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDFileAggr, SDataCols *pDataCols, int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDFileAggr, SDataCols *pDataCols,
SBlock *pBlock, bool isLast, bool isSuper, void **ppBuf, void **ppCBuf, void **ppExBuf) { SBlock *pBlock, bool isLast, bool isSuper, void **ppBuf, void **ppCBuf, void **ppExBuf) {
STsdbCfg * pCfg = REPO_CFG(pRepo); STsdbCfg *pCfg = REPO_CFG(pRepo);
SBlockData * pBlockData = NULL; SBlockData *pBlockData = NULL;
SAggrBlkData *pAggrBlkData = NULL; SAggrBlkData *pAggrBlkData = NULL;
STSchema *pSchema = pTable->pSchema;
int64_t offset = 0, offsetAggr = 0; int64_t offset = 0, offsetAggr = 0;
int rowsToWrite = pDataCols->numOfRows; int rowsToWrite = pDataCols->numOfRows;
...@@ -1225,10 +1226,12 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF ...@@ -1225,10 +1226,12 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
pAggrBlkData = (SAggrBlkData *)(*ppExBuf); pAggrBlkData = (SAggrBlkData *)(*ppExBuf);
// Get # of cols not all NULL(not including key column) // Get # of cols not all NULL(not including key column)
int nColsNotAllNull = 0; col_id_t nColsNotAllNull = 0;
col_id_t nColsOfBlockSma = 0;
for (int ncol = 1; ncol < pDataCols->numOfCols; ++ncol) { // ncol from 1, we skip the timestamp column for (int ncol = 1; ncol < pDataCols->numOfCols; ++ncol) { // ncol from 1, we skip the timestamp column
SDataCol * pDataCol = pDataCols->cols + ncol; STColumn *pColumn = pSchema->columns + ncol;
SBlockCol * pBlockCol = pBlockData->cols + nColsNotAllNull; SDataCol *pDataCol = pDataCols->cols + ncol;
SBlockCol *pBlockCol = pBlockData->cols + nColsNotAllNull;
SAggrBlkCol *pAggrBlkCol = (SAggrBlkCol *)pAggrBlkData + nColsNotAllNull; SAggrBlkCol *pAggrBlkCol = (SAggrBlkCol *)pAggrBlkData + nColsNotAllNull;
if (isAllRowsNull(pDataCol)) { // all data to commit are NULL, just ignore it if (isAllRowsNull(pDataCol)) { // all data to commit are NULL, just ignore it
...@@ -1260,7 +1263,12 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF ...@@ -1260,7 +1263,12 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
} else { } else {
TD_SET_COL_ROWS_MISC(pBlockCol); TD_SET_COL_ROWS_MISC(pBlockCol);
} }
nColsNotAllNull++;
++nColsNotAllNull;
if (pColumn->sma) {
++nColsOfBlockSma;
}
} }
ASSERT(nColsNotAllNull >= 0 && nColsNotAllNull <= pDataCols->numOfCols); ASSERT(nColsNotAllNull >= 0 && nColsNotAllNull <= pDataCols->numOfCols);
...@@ -1357,9 +1365,8 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF ...@@ -1357,9 +1365,8 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
return -1; return -1;
} }
uint32_t aggrStatus = nColsNotAllNull > 0 ? 1 : 0; uint32_t aggrStatus = nColsOfBlockSma > 0 ? 1 : 0;
if (aggrStatus > 0) { if (aggrStatus > 0) {
taosCalcChecksumAppend(0, (uint8_t *)pAggrBlkData, tsizeAggr); taosCalcChecksumAppend(0, (uint8_t *)pAggrBlkData, tsizeAggr);
tsdbUpdateDFileMagic(pDFileAggr, POINTER_SHIFT(pAggrBlkData, tsizeAggr - sizeof(TSCKSUM))); tsdbUpdateDFileMagic(pDFileAggr, POINTER_SHIFT(pAggrBlkData, tsizeAggr - sizeof(TSCKSUM)));
...@@ -1378,6 +1385,7 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF ...@@ -1378,6 +1385,7 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDF
pBlock->keyLen = keyLen; pBlock->keyLen = keyLen;
pBlock->numOfSubBlocks = isSuper ? 1 : 0; pBlock->numOfSubBlocks = isSuper ? 1 : 0;
pBlock->numOfCols = nColsNotAllNull; pBlock->numOfCols = nColsNotAllNull;
pBlock->numOfBSma = nColsOfBlockSma;
pBlock->keyFirst = dataColsKeyFirst(pDataCols); pBlock->keyFirst = dataColsKeyFirst(pDataCols);
pBlock->keyLast = dataColsKeyLast(pDataCols); pBlock->keyLast = dataColsKeyLast(pDataCols);
pBlock->aggrStat = aggrStatus; pBlock->aggrStat = aggrStatus;
......
...@@ -321,7 +321,7 @@ int tsdbLoadBlockStatis(SReadH *pReadh, SBlock *pBlock) { ...@@ -321,7 +321,7 @@ int tsdbLoadBlockStatis(SReadH *pReadh, SBlock *pBlock) {
return -1; return -1;
} }
size_t sizeAggr = tsdbBlockAggrSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer); size_t sizeAggr = tsdbBlockAggrSize(pBlock->numOfBSma, (uint32_t)pBlock->blkVer);
if (tsdbMakeRoom((void **)(&(pReadh->pAggrBlkData)), sizeAggr) < 0) return -1; if (tsdbMakeRoom((void **)(&(pReadh->pAggrBlkData)), sizeAggr) < 0) return -1;
int64_t nreadAggr = tsdbReadDFile(pDFileAggr, (void *)(pReadh->pAggrBlkData), sizeAggr); int64_t nreadAggr = tsdbReadDFile(pDFileAggr, (void *)(pReadh->pAggrBlkData), sizeAggr);
......
...@@ -189,12 +189,16 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) { ...@@ -189,12 +189,16 @@ int vnodeApplyWMsg(SVnode *pVnode, SRpcMsg *pMsg, SRpcMsg **pRsp) {
} }
} break; } break;
case TDMT_VND_CREATE_SMA: { // timeRangeSMA case TDMT_VND_CREATE_SMA: { // timeRangeSMA
#if 0 #if 1
SSmaCfg vCreateSmaReq = {0}; SSmaCfg vCreateSmaReq = {0};
if (tDeserializeSVCreateTSmaReq(POINTER_SHIFT(pMsg->pCont, sizeof(SMsgHead)), &vCreateSmaReq) == NULL) { if (tDeserializeSVCreateTSmaReq(POINTER_SHIFT(pMsg->pCont, sizeof(SMsgHead)), &vCreateSmaReq) == NULL) {
terrno = TSDB_CODE_OUT_OF_MEMORY; terrno = TSDB_CODE_OUT_OF_MEMORY;
vWarn("vgId%d: TDMT_VND_CREATE_SMA received but deserialize failed since %s", pVnode->config.vgId, terrstr(terrno));
return -1; return -1;
} }
vWarn("vgId%d: TDMT_VND_CREATE_SMA received for %s:%" PRIi64, pVnode->config.vgId, vCreateSmaReq.tSma.indexName,
vCreateSmaReq.tSma.indexUid);
// record current timezone of server side // record current timezone of server side
tstrncpy(vCreateSmaReq.tSma.timezone, tsTimezoneStr, TD_TIMEZONE_LEN); tstrncpy(vCreateSmaReq.tSma.timezone, tsTimezoneStr, TD_TIMEZONE_LEN);
......
...@@ -330,7 +330,6 @@ TEST(testCase, tSma_Data_Insert_Query_Test) { ...@@ -330,7 +330,6 @@ TEST(testCase, tSma_Data_Insert_Query_Test) {
ASSERT_EQ(metaSaveSmaToDB(pMeta, pSmaCfg), 0); ASSERT_EQ(metaSaveSmaToDB(pMeta, pSmaCfg), 0);
// step 2: insert data // step 2: insert data
STSmaDataWrapper *pSmaData = NULL;
STsdb *pTsdb = (STsdb *)taosMemoryCalloc(1, sizeof(STsdb)); STsdb *pTsdb = (STsdb *)taosMemoryCalloc(1, sizeof(STsdb));
STsdbCfg *pCfg = &pTsdb->config; STsdbCfg *pCfg = &pTsdb->config;
...@@ -416,6 +415,8 @@ TEST(testCase, tSma_Data_Insert_Query_Test) { ...@@ -416,6 +415,8 @@ TEST(testCase, tSma_Data_Insert_Query_Test) {
col_id_t numOfCols = 4096; col_id_t numOfCols = 4096;
ASSERT_GT(numOfCols, 0); ASSERT_GT(numOfCols, 0);
#if 0
STSmaDataWrapper *pSmaData = NULL;
pSmaData = (STSmaDataWrapper *)buf; pSmaData = (STSmaDataWrapper *)buf;
printf(">> allocate [%d] time to %d and addr is %p\n", ++allocCnt, bufSize, pSmaData); printf(">> allocate [%d] time to %d and addr is %p\n", ++allocCnt, bufSize, pSmaData);
pSmaData->skey = skey1; pSmaData->skey = skey1;
...@@ -459,9 +460,13 @@ TEST(testCase, tSma_Data_Insert_Query_Test) { ...@@ -459,9 +460,13 @@ TEST(testCase, tSma_Data_Insert_Query_Test) {
pSmaData->dataLen = (len - sizeof(STSmaDataWrapper)); pSmaData->dataLen = (len - sizeof(STSmaDataWrapper));
ASSERT_GE(bufSize, pSmaData->dataLen); ASSERT_GE(bufSize, pSmaData->dataLen);
// execute // execute
ASSERT_EQ(tsdbInsertTSmaData(pTsdb, (char *)pSmaData), TSDB_CODE_SUCCESS); ASSERT_EQ(tsdbInsertTSmaData(pTsdb, (char *)pSmaData), TSDB_CODE_SUCCESS);
#endif
SSDataBlock *pSmaData = (SSDataBlock *)taosMemoryCalloc(1, sizeof(SSDataBlock));
// step 3: query // step 3: query
uint32_t checkDataCnt = 0; uint32_t checkDataCnt = 0;
......
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