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Merge pull request #17389 from taosdata/fix/liao_cov 

fix(query): fix bug in group by tag.
This commit is contained in:
Haojun Liao 2022-10-17 15:06:26 +08:00 committed by GitHub
parent 77e40abea2 ed9ec795eb
commit 08397dc698
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 63 additions and 86 deletions
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15
source/dnode/vnode/src/tsdb/tsdbMergeTree.c
View File

@ -151,9 +151,6 @@ static SBlockData *loadLastBlock(SLDataIter *pIter, const char *idStr) {
", last file index:%d, last block index:%d, entry:%d, %p, elapsed time:%.2f ms, %s",
pInfo->loadBlocks, pIter->uid, pIter->iStt, pIter->iSttBlk, pInfo->currentLoadBlockIndex, pBlock, el,
idStr);
if (code != TSDB_CODE_SUCCESS) {
goto _exit;
}
pInfo->blockIndex[pInfo->currentLoadBlockIndex] = pIter->iSttBlk;
tsdbDebug("last block index list:%d, %d, %s", pInfo->blockIndex[0], pInfo->blockIndex[1], idStr);
@ -466,8 +463,8 @@ static void findNextValidRow(SLDataIter *pIter, const char *idStr) {
}
bool tLDataIterNextRow(SLDataIter *pIter, const char *idStr) {
int32_t code = 0;
int32_t step = pIter->backward ? -1 : 1;
terrno = TSDB_CODE_SUCCESS;
// no qualified last file block in current file, no need to fetch row
if (pIter->pSttBlk == NULL) {
@ -476,6 +473,10 @@ bool tLDataIterNextRow(SLDataIter *pIter, const char *idStr) {
int32_t iBlockL = pIter->iSttBlk;
SBlockData *pBlockData = loadLastBlock(pIter, idStr);
if (pBlockData == NULL && terrno != TSDB_CODE_SUCCESS) {
goto _exit;
}
pIter->iRow += step;
while (1) {
@ -501,11 +502,7 @@ bool tLDataIterNextRow(SLDataIter *pIter, const char *idStr) {
pIter->rInfo.row = tsdbRowFromBlockData(pBlockData, pIter->iRow);
_exit:
if (code != TSDB_CODE_SUCCESS) {
terrno = code;
}
return (code == TSDB_CODE_SUCCESS) && (pIter->pSttBlk != NULL);
return (terrno == TSDB_CODE_SUCCESS) && (pIter->pSttBlk != NULL);
}
SRowInfo *tLDataIterGet(SLDataIter *pIter) { return &pIter->rInfo; }

15
source/dnode/vnode/src/tsdb/tsdbRead.c
View File

@ -340,7 +340,7 @@ static int32_t initFilesetIterator(SFilesetIter* pIter, SArray* aDFileSet, STsdb
pIter->pLastBlockReader = taosMemoryCalloc(1, sizeof(struct SLastBlockReader));
if (pIter->pLastBlockReader == NULL) {
int32_t code = TSDB_CODE_OUT_OF_MEMORY;
tsdbError("failed to prepare the last block iterator, code:%d %s", tstrerror(code), pReader->idStr);
tsdbError("failed to prepare the last block iterator, code:%s %s", tstrerror(code), pReader->idStr);
return code;
}
}
@ -646,7 +646,7 @@ static int32_t doLoadFileBlock(STsdbReader* pReader, SArray* pIndexList, SBlockN
double el = (taosGetTimestampUs() - st) / 1000.0;
tsdbDebug(
"load block of %d tables completed, blocks:%d in %d tables, last-files:%d, block-info-size:%.2f Kb, elapsed "
"load block of %"PRIzu" tables completed, blocks:%d in %d tables, last-files:%d, block-info-size:%.2f Kb, elapsed "
"time:%.2f ms %s",
numOfTables, pBlockNum->numOfBlocks, numOfQTable, pBlockNum->numOfLastFiles, sizeInDisk / 1000.0, el,
pReader->idStr);
@ -1515,6 +1515,11 @@ static FORCE_INLINE STSchema* doGetSchemaForTSRow(int32_t sversion, STsdbReader*
taosMemoryFree(pReader->pMemSchema);
int32_t code = metaGetTbTSchemaEx(pReader->pTsdb->pVnode->pMeta, pReader->suid, uid, sversion, &pReader->pMemSchema);
if (code != TSDB_CODE_SUCCESS) {
terrno = code;
return NULL;
}
return pReader->pMemSchema;
}
@ -3085,7 +3090,7 @@ int32_t doMergeMemIMemRows(TSDBROW* pRow, TSDBROW* piRow, STableBlockScanInfo* p
doMergeRowsInBuf(&pBlockScanInfo->iter, pBlockScanInfo->uid, k.ts, pBlockScanInfo->delSkyline, &merge, pReader);
tRowMerge(&merge, piRow);
doMergeRowsInBuf(&pBlockScanInfo->iiter, pBlockScanInfo->uid, k.ts, pBlockScanInfo->delSkyline, &merge, pReader);
doMergeRowsInBuf(&pBlockScanInfo->iiter, pBlockScanInfo->uid, ik.ts, pBlockScanInfo->delSkyline, &merge, pReader);
}
int32_t code = tRowMergerGetRow(&merge, pTSRow);
@ -3443,7 +3448,7 @@ int32_t tsdbReaderOpen(SVnode* pVnode, SQueryTableDataCond* pCond, SArray* pTabl
return code;
_err:
tsdbError("failed to create data reader, code:%s %s", tstrerror(code), pReader->idStr);
tsdbError("failed to create data reader, code:%s %s", tstrerror(code), idstr);
return code;
}
@ -3732,7 +3737,7 @@ SArray* tsdbRetrieveDataBlock(STsdbReader* pReader, SArray* pIdList) {
}
int32_t tsdbReaderReset(STsdbReader* pReader, SQueryTableDataCond* pCond) {
if (isEmptyQueryTimeWindow(&pReader->window)) {
if (isEmptyQueryTimeWindow(&pReader->window) || pReader->pReadSnap == NULL) {
return TSDB_CODE_SUCCESS;
}

4
source/libs/executor/src/executil.c
View File

@ -1138,7 +1138,7 @@ static SResSchema createResSchema(int32_t type, int32_t bytes, int32_t slotId, i
s.bytes = bytes;
s.slotId = slotId;
s.precision = precision;
strncpy(s.name, name, tListLen(s.name));
tstrncpy(s.name, name, tListLen(s.name));
return s;
}
@ -1366,7 +1366,7 @@ SqlFunctionCtx* createSqlFunctionCtx(SExprInfo* pExprInfo, int32_t numOfOutput,
fmGetFuncExecFuncs(pCtx->functionId, &pCtx->fpSet);
} else {
char* udfName = pExpr->pExpr->_function.pFunctNode->functionName;
strncpy(pCtx->udfName, udfName, TSDB_FUNC_NAME_LEN);
tstrncpy(pCtx->udfName, udfName, TSDB_FUNC_NAME_LEN);
fmGetUdafExecFuncs(pCtx->functionId, &pCtx->fpSet);
}
pCtx->fpSet.getEnv(pExpr->pExpr->_function.pFunctNode, &env);

16
source/libs/executor/src/executor.c
View File

@ -616,7 +616,7 @@ int32_t qSerializeTaskStatus(qTaskInfo_t tinfo, char** pOutput, int32_t* len) {
int32_t nOptrWithVal = 0;
int32_t code = encodeOperator(pTaskInfo->pRoot, pOutput, len, &nOptrWithVal);
if ((code == TSDB_CODE_SUCCESS) && (nOptrWithVal = 0)) {
if ((code == TSDB_CODE_SUCCESS) && (nOptrWithVal == 0)) {
taosMemoryFreeClear(*pOutput);
*len = 0;
}
@ -701,10 +701,10 @@ int32_t qStreamExtractOffset(qTaskInfo_t tinfo, STqOffsetVal* pOffset) {
return 0;
}
int32_t initQueryTableDataCondForTmq(SQueryTableDataCond* pCond, SSnapContext* sContext, SMetaTableInfo mtInfo) {
int32_t initQueryTableDataCondForTmq(SQueryTableDataCond* pCond, SSnapContext* sContext, SMetaTableInfo* pMtInfo) {
memset(pCond, 0, sizeof(SQueryTableDataCond));
pCond->order = TSDB_ORDER_ASC;
pCond->numOfCols = mtInfo.schema->nCols;
pCond->numOfCols = pMtInfo->schema->nCols;
pCond->colList = taosMemoryCalloc(pCond->numOfCols, sizeof(SColumnInfo));
if (pCond->colList == NULL) {
terrno = TSDB_CODE_QRY_OUT_OF_MEMORY;
@ -712,15 +712,15 @@ int32_t initQueryTableDataCondForTmq(SQueryTableDataCond* pCond, SSnapContext* s
}
pCond->twindows = (STimeWindow){.skey = INT64_MIN, .ekey = INT64_MAX};
pCond->suid = mtInfo.suid;
pCond->suid = pMtInfo->suid;
pCond->type = TIMEWINDOW_RANGE_CONTAINED;
pCond->startVersion = -1;
pCond->endVersion = sContext->snapVersion;
for (int32_t i = 0; i < pCond->numOfCols; ++i) {
pCond->colList[i].type = mtInfo.schema->pSchema[i].type;
pCond->colList[i].bytes = mtInfo.schema->pSchema[i].bytes;
pCond->colList[i].colId = mtInfo.schema->pSchema[i].colId;
pCond->colList[i].type = pMtInfo->schema->pSchema[i].type;
pCond->colList[i].bytes = pMtInfo->schema->pSchema[i].bytes;
pCond->colList[i].colId = pMtInfo->schema->pSchema[i].colId;
}
return TSDB_CODE_SUCCESS;
@ -844,7 +844,7 @@ int32_t qStreamPrepareScan(qTaskInfo_t tinfo, STqOffsetVal* pOffset, int8_t subT
taosArrayDestroy(pTaskInfo->tableqinfoList.pTableList);
if (mtInfo.uid == 0) return 0; // no data
initQueryTableDataCondForTmq(&pTaskInfo->streamInfo.tableCond, sContext, mtInfo);
initQueryTableDataCondForTmq(&pTaskInfo->streamInfo.tableCond, sContext, &mtInfo);
pTaskInfo->streamInfo.tableCond.twindows.skey = pOffset->ts;
pTaskInfo->tableqinfoList.pTableList = taosArrayInit(1, sizeof(STableKeyInfo));
taosArrayPush(pTaskInfo->tableqinfoList.pTableList, &(STableKeyInfo){.uid = mtInfo.uid, .groupId = 0});

35
source/libs/executor/src/executorimpl.c
View File

@ -895,33 +895,6 @@ static bool overlapWithTimeWindow(STaskAttr* pQueryAttr, SDataBlockInfo* pBlockI
}
#endif
static uint32_t doFilterByBlockTimeWindow(STableScanInfo* pTableScanInfo, SSDataBlock* pBlock) {
#if 0
SqlFunctionCtx* pCtx = pTableScanInfo->pCtx;
uint32_t status = BLK_DATA_NOT_LOAD;
int32_t numOfOutput = 0; // pTableScanInfo->numOfOutput;
for (int32_t i = 0; i < numOfOutput; ++i) {
int32_t functionId = pCtx[i].functionId;
int32_t colId = pTableScanInfo->pExpr[i].base.pParam[0].pCol->colId;
// group by + first/last should not apply the first/last block filter
if (functionId < 0) {
status |= BLK_DATA_DATA_LOAD;
return status;
} else {
// status |= aAggs[functionId].dataReqFunc(&pTableScanInfo->pCtx[i], &pBlock->info.window, colId);
// if ((status & BLK_DATA_DATA_LOAD) == BLK_DATA_DATA_LOAD) {
// return status;
// }
}
}
return status;
#endif
return 0;
}
int32_t loadDataBlockOnDemand(SExecTaskInfo* pTaskInfo, STableScanInfo* pTableScanInfo, SSDataBlock* pBlock,
uint32_t* status) {
*status = BLK_DATA_NOT_LOAD;
@ -1802,7 +1775,7 @@ int32_t loadRemoteDataCallback(void* param, SDataBuf* pMsg, int32_t code) {
} else {
taosMemoryFree(pMsg->pData);
pSourceDataInfo->code = code;
qDebug("%s fetch rsp received, index:%d, error:%d", pSourceDataInfo->taskId, index, tstrerror(code));
qDebug("%s fetch rsp received, index:%d, code:%s", pSourceDataInfo->taskId, index, tstrerror(code));
}
pSourceDataInfo->status = EX_SOURCE_DATA_READY;
@ -3397,8 +3370,8 @@ SSchemaWrapper* extractQueriedColumnSchema(SScanPhysiNode* pScanNode) {
SSchema* pSchema = &pqSw->pSchema[pqSw->nCols++];
pSchema->colId = pColNode->colId;
pSchema->type = pColNode->node.resType.type;
pSchema->type = pColNode->node.resType.bytes;
strncpy(pSchema->name, pColNode->colName, tListLen(pSchema->name));
pSchema->bytes = pColNode->node.resType.bytes;
tstrncpy(pSchema->name, pColNode->colName, tListLen(pSchema->name));
}
// this the tags and pseudo function columns, we only keep the tag columns
@ -3412,7 +3385,7 @@ SSchemaWrapper* extractQueriedColumnSchema(SScanPhysiNode* pScanNode) {
SSchema* pSchema = &pqSw->pSchema[pqSw->nCols++];
pSchema->colId = pColNode->colId;
pSchema->type = pColNode->node.resType.type;
pSchema->type = pColNode->node.resType.bytes;
pSchema->bytes = pColNode->node.resType.bytes;
strncpy(pSchema->name, pColNode->colName, tListLen(pSchema->name));
}
}

44
source/libs/executor/src/scanoperator.c
View File

@ -284,6 +284,19 @@ static bool doLoadBlockSMA(STableScanInfo* pTableScanInfo, SSDataBlock* pBlock,
return true;
}
static void doSetTagColumnData(STableScanInfo* pTableScanInfo, SSDataBlock* pBlock, SExecTaskInfo* pTaskInfo) {
if (pTableScanInfo->pseudoSup.numOfExprs > 0) {
SExprSupp* pSup = &pTableScanInfo->pseudoSup;
int32_t code = addTagPseudoColumnData(&pTableScanInfo->readHandle, pSup->pExprInfo, pSup->numOfExprs, pBlock,
GET_TASKID(pTaskInfo));
if (code != TSDB_CODE_SUCCESS) {
T_LONG_JMP(pTaskInfo->env, code);
}
}
}
static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableScanInfo, SSDataBlock* pBlock,
uint32_t* status) {
SExecTaskInfo* pTaskInfo = pOperator->pTaskInfo;
@ -312,8 +325,9 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
} else if (*status == FUNC_DATA_REQUIRED_NOT_LOAD) {
qDebug("%s data block skipped, brange:%" PRId64 "-%" PRId64 ", rows:%d", GET_TASKID(pTaskInfo),
pBlockInfo->window.skey, pBlockInfo->window.ekey, pBlockInfo->rows);
pCost->skipBlocks += 1;
doSetTagColumnData(pTableScanInfo, pBlock, pTaskInfo);
pCost->skipBlocks += 1;
return TSDB_CODE_SUCCESS;
} else if (*status == FUNC_DATA_REQUIRED_STATIS_LOAD) {
pCost->loadBlockStatis += 1;
@ -322,6 +336,7 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
if (success) { // failed to load the block sma data, data block statistics does not exist, load data block instead
qDebug("%s data block SMA loaded, brange:%" PRId64 "-%" PRId64 ", rows:%d", GET_TASKID(pTaskInfo),
pBlockInfo->window.skey, pBlockInfo->window.ekey, pBlockInfo->rows);
doSetTagColumnData(pTableScanInfo, pBlock, pTaskInfo);
return TSDB_CODE_SUCCESS;
} else {
qDebug("%s failed to load SMA, since not all columns have SMA", GET_TASKID(pTaskInfo));
@ -371,17 +386,7 @@ static int32_t loadDataBlock(SOperatorInfo* pOperator, STableScanInfo* pTableSca
}
relocateColumnData(pBlock, pTableScanInfo->pColMatchInfo, pCols, true);
// currently only the tbname pseudo column
if (pTableScanInfo->pseudoSup.numOfExprs > 0) {
SExprSupp* pSup = &pTableScanInfo->pseudoSup;
int32_t code = addTagPseudoColumnData(&pTableScanInfo->readHandle, pSup->pExprInfo, pSup->numOfExprs, pBlock,
GET_TASKID(pTaskInfo));
if (code != TSDB_CODE_SUCCESS) {
T_LONG_JMP(pTaskInfo->env, code);
}
}
doSetTagColumnData(pTableScanInfo, pBlock, pTaskInfo);
if (pTableScanInfo->pFilterNode != NULL) {
int64_t st = taosGetTimestampUs();
@ -1079,12 +1084,13 @@ static bool prepareRangeScan(SStreamScanInfo* pInfo, SSDataBlock* pBlock, int32_
static STimeWindow getSlidingWindow(TSKEY* startTsCol, TSKEY* endTsCol, uint64_t* gpIdCol, SInterval* pInterval,
SDataBlockInfo* pDataBlockInfo, int32_t* pRowIndex, bool hasGroup) {
SResultRowInfo dumyInfo;
SResultRowInfo dumyInfo = {0};
dumyInfo.cur.pageId = -1;
STimeWindow win = getActiveTimeWindow(NULL, &dumyInfo, startTsCol[*pRowIndex], pInterval, TSDB_ORDER_ASC);
STimeWindow endWin = win;
STimeWindow preWin = win;
uint64_t groupId = gpIdCol[*pRowIndex];
while (1) {
if (hasGroup) {
(*pRowIndex) += 1;
@ -1148,6 +1154,9 @@ static SSDataBlock* doRangeScan(SStreamScanInfo* pInfo, SSDataBlock* pSDB, int32
pResult->info.rows++;
}
}
blockDataDestroy(tmpBlock);
if (pResult->info.rows > 0) {
pResult->info.calWin = pInfo->updateWin;
return pResult;
@ -1316,7 +1325,7 @@ static void calBlockTag(SExprSupp* pTagCalSup, SSDataBlock* pBlock, SSDataBlock*
blockDataEnsureCapacity(pResBlock, 1);
projectApplyFunctions(pTagCalSup->pExprInfo, pResBlock, pSrcBlock, pTagCalSup->pCtx, pTagCalSup->numOfExprs, NULL);
projectApplyFunctions(pTagCalSup->pExprInfo, pResBlock, pSrcBlock, pTagCalSup->pCtx, 1, NULL);
ASSERT(pResBlock->info.rows == 1);
// build tagArray
@ -1543,7 +1552,7 @@ static SSDataBlock* doQueueScan(SOperatorInfo* pOperator) {
tsdbReaderClose(pTSInfo->dataReader);
pTSInfo->dataReader = NULL;
tqOffsetResetToLog(&pTaskInfo->streamInfo.prepareStatus, pTaskInfo->streamInfo.snapshotVer);
qDebug("queue scan tsdb over, switch to wal ver %d", pTaskInfo->streamInfo.snapshotVer + 1);
qDebug("queue scan tsdb over, switch to wal ver %"PRId64, pTaskInfo->streamInfo.snapshotVer + 1);
if (tqSeekVer(pInfo->tqReader, pTaskInfo->streamInfo.snapshotVer + 1) < 0) {
return NULL;
}
@ -2120,9 +2129,6 @@ static void destroyStreamScanOperatorInfo(void* param) {
taosMemoryFree(pStreamScan->pPseudoExpr);
}
cleanupExprSupp(&pStreamScan->tbnameCalSup);
cleanupExprSupp(&pStreamScan->tagCalSup);
updateInfoDestroy(pStreamScan->pUpdateInfo);
blockDataDestroy(pStreamScan->pRes);
blockDataDestroy(pStreamScan->pUpdateRes);
@ -2995,7 +3001,7 @@ static SSDataBlock* doSysTableScan(SOperatorInfo* pOperator) {
while (1) {
int64_t startTs = taosGetTimestampUs();
strncpy(pInfo->req.tb, tNameGetTableName(&pInfo->name), tListLen(pInfo->req.tb));
tstrncpy(pInfo->req.tb, tNameGetTableName(&pInfo->name), tListLen(pInfo->req.tb));
strcpy(pInfo->req.user, pInfo->pUser);
int32_t contLen = tSerializeSRetrieveTableReq(NULL, 0, &pInfo->req);

4
source/libs/executor/src/timewindowoperator.c
View File

@ -2842,14 +2842,13 @@ SOperatorInfo* createSessionAggOperatorInfo(SOperatorInfo* downstream, SSessionW
int32_t numOfCols = 0;
SExprInfo* pExprInfo = createExprInfo(pSessionNode->window.pFuncs, NULL, &numOfCols);
SSDataBlock* pResBlock = createResDataBlock(pSessionNode->window.node.pOutputDataBlockDesc);
initBasicInfo(&pInfo->binfo, pResBlock);
int32_t code = initAggInfo(&pOperator->exprSupp, &pInfo->aggSup, pExprInfo, numOfCols, keyBufSize, pTaskInfo->id.str);
if (code != TSDB_CODE_SUCCESS) {
goto _error;
}
initBasicInfo(&pInfo->binfo, pResBlock);
pInfo->twAggSup.waterMark = pSessionNode->window.watermark;
pInfo->twAggSup.calTrigger = pSessionNode->window.triggerType;
pInfo->gap = pSessionNode->gap;
@ -4666,7 +4665,6 @@ void destroyStreamStateOperatorInfo(void* param) {
SStreamSessionAggOperatorInfo* pChInfo = pChild->info;
destroyStreamSessionAggOperatorInfo(pChInfo);
taosMemoryFreeClear(pChild);
taosMemoryFreeClear(pChInfo);
}
}
colDataDestroy(&pInfo->twAggSup.timeWindowData);

4
source/libs/executor/src/tsimplehash.c
View File

@ -18,7 +18,7 @@
#include "tlog.h"
#define SHASH_DEFAULT_LOAD_FACTOR 0.75
#define HASH_MAX_CAPACITY (1024 * 1024 * 16)
#define HASH_MAX_CAPACITY (1024 * 1024 * 16L)
#define SHASH_NEED_RESIZE(_h) ((_h)->size >= (_h)->capacity * SHASH_DEFAULT_LOAD_FACTOR)
#define GET_SHASH_NODE_KEY(_n, _dl) ((char *)(_n) + sizeof(SHNode) + (_dl))
@ -104,7 +104,7 @@ static void tSimpleHashTableResize(SSHashObj *pHashObj) {
int32_t newCapacity = (int32_t)(pHashObj->capacity << 1u);
if (newCapacity > HASH_MAX_CAPACITY) {
uDebug("current capacity:%zu, maximum capacity:%" PRIu64 ", no resize applied due to limitation is reached",
uDebug("current capacity:%"PRIzu", maximum capacity:%" PRIu64 ", no resize applied due to limitation is reached",
pHashObj->capacity, HASH_MAX_CAPACITY);
return;
}

5
source/libs/planner/src/planOptimizer.c
View File

@ -124,9 +124,8 @@ static void optSetParentOrder(SLogicNode* pNode, EOrder order) {
EDealRes scanPathOptHaveNormalColImpl(SNode* pNode, void* pContext) {
if (QUERY_NODE_COLUMN == nodeType(pNode)) {
// *((bool*)pContext) =
// (COLUMN_TYPE_TAG != ((SColumnNode*)pNode)->colType && COLUMN_TYPE_TBNAME != ((SColumnNode*)pNode)->colType);
*((bool*)pContext) = true;
*((bool*)pContext) =
(COLUMN_TYPE_TAG != ((SColumnNode*)pNode)->colType && COLUMN_TYPE_TBNAME != ((SColumnNode*)pNode)->colType);
return *((bool*)pContext) ? DEAL_RES_END : DEAL_RES_IGNORE_CHILD;
}
return DEAL_RES_CONTINUE;

7
tools/shell/src/shellTire.c
View File

@ -243,8 +243,8 @@ void enumAllWords(STireNode** nodes, char* prefix, SMatch* match) {
continue;
} else {
// combine word string
memset(word, 0, sizeof(word));
strcpy(word, prefix);
memset(word, 0, tListLen(word));
strncpy(word, prefix, len);
word[len] = FIRST_ASCII + i; // append current char
// chain middle node
@ -315,8 +315,7 @@ void matchPrefixFromTree(STire* tire, char* prefix, SMatch* match) {
}
}
// return
return;
taosMemoryFree(root);
}
SMatch* matchPrefix(STire* tire, char* prefix, SMatch* match) {