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fix(query): select last(*) from super table returns 0 if all columns 

are NULL.

TD-16561
This commit is contained in:
Ganlin Zhao 2022-06-20 16:11:42 +08:00
parent 3155a228e5
commit 63a917581d
1 changed files with 4 additions and 4 deletions
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8
source/libs/function/src/builtinsimpl.c
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@ -2563,9 +2563,6 @@ int32_t lastFunction(SqlFunctionCtx* pCtx) {
}
static void firstLastTransferInfo(SFirstLastRes* pInput, SFirstLastRes* pOutput, bool isFirst) {
if (!pInput->hasResult) {
return;
}
pOutput->bytes = pInput->bytes;
TSKEY* tsIn = (TSKEY*)(pInput->buf + pInput->bytes);
TSKEY* tsOut = (TSKEY*)(pOutput->buf + pInput->bytes);
@ -2599,7 +2596,9 @@ static int32_t firstLastFunctionMergeImpl(SqlFunctionCtx* pCtx, bool isFirstQuer
firstLastTransferInfo(pInputInfo, pInfo, isFirstQuery);
SET_VAL(GET_RES_INFO(pCtx), 1, 1);
int32_t numOfElems = pInputInfo->hasResult ? 1 : 0;
SET_VAL(GET_RES_INFO(pCtx), numOfElems, 1);
return TSDB_CODE_SUCCESS;
}
@ -2624,6 +2623,7 @@ int32_t firstLastFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
int32_t firstLastPartialFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
SResultRowEntryInfo* pEntryInfo = GET_RES_INFO(pCtx);
SFirstLastRes* pRes = GET_ROWCELL_INTERBUF(GET_RES_INFO(pCtx));
int32_t resultBytes = getFirstLastInfoSize(pRes->bytes);
char* res = taosMemoryCalloc(resultBytes + VARSTR_HEADER_SIZE, sizeof(char));