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fix: the problem of null in case when expression

This commit is contained in:
Xiaoyu Wang 2022-11-11 11:24:24 +08:00
parent a5dd241af0
commit 35b79e7e69
1 changed files with 19 additions and 2 deletions
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21
source/libs/parser/src/parTranslater.c
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@ -1878,6 +1878,7 @@ static int32_t rewriteIsTrue(SNode* pSrc, SNode** pIsTrue) {
static EDealRes translateCaseWhen(STranslateContext* pCxt, SCaseWhenNode* pCaseWhen) {
bool first = true;
bool allNullThen = true;
SNode* pNode = NULL;
FOREACH(pNode, pCaseWhen->pWhenThenList) {
SWhenThenNode* pWhenThen = (SWhenThenNode*)pNode;
@ -1889,12 +1890,28 @@ static EDealRes translateCaseWhen(STranslateContext* pCxt, SCaseWhenNode* pCaseW
}
pWhenThen->pWhen = pIsTrue;
}
if (first || dataTypeComp(&pCaseWhen->node.resType, &((SExprNode*)pNode)->resType) < 0) {
pCaseWhen->node.resType = ((SExprNode*)pNode)->resType;
SExprNode* pThenExpr = (SExprNode*)pNode;
if (TSDB_DATA_TYPE_NULL == pThenExpr->resType.type) {
continue;
}
allNullThen = false;
if (first || dataTypeComp(&pCaseWhen->node.resType, &pThenExpr->resType) < 0) {
pCaseWhen->node.resType = pThenExpr->resType;
}
first = false;
}
if (allNullThen) {
if (NULL != pCaseWhen->pElse) {
pCaseWhen->node.resType = ((SExprNode*)pCaseWhen->pElse)->resType;
} else {
pCaseWhen->node.resType.type = TSDB_DATA_TYPE_NULL;
pCaseWhen->node.resType.bytes = tDataTypes[TSDB_DATA_TYPE_NULL].bytes;
return DEAL_RES_CONTINUE;
}
}
FOREACH(pNode, pCaseWhen->pWhenThenList) {
SWhenThenNode* pWhenThen = (SWhenThenNode*)pNode;
if (!dataTypeEqual(&pCaseWhen->node.resType, &((SExprNode*)pNode)->resType)) {