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fix: add merge parent project and child project optimization

This commit is contained in:
slzhou 2022-06-28 10:55:34 +08:00
parent 474c84bcc9
commit f80af20d3b
1 changed files with 43 additions and 5 deletions
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48
source/libs/planner/src/planOptimizer.c
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@ -1375,19 +1375,57 @@ static bool mergeProjectsMayBeOptimized(SLogicNode* pNode) {
}
typedef struct SMergeProjectionsContext {
SProjectLogicNode* pChildProj;
int32_t errCode;
} SMergeProjectionsContext;
static EDealRes mergeProjectionsExpr(SNode** pNode, void* pContext) {
SMergeProjectionsContext* pCxt = pContext;
SProjectLogicNode* pChildProj = pCxt->pChildProj;
if (QUERY_NODE_COLUMN == nodeType(*pNode)) {
SNode* pTarget;
FOREACH(pTarget, ((SLogicNode*)pChildProj)->pTargets) {
if (nodesEqualNode(pTarget, *pNode)) {
SNode* pProjection;
FOREACH(pProjection, pChildProj->pProjections) {
if (0 == strcmp(((SColumnNode*)pTarget)->colName, ((SExprNode*)pProjection)->aliasName)) {
SNode* pExpr = nodesCloneNode(pProjection);
if (pExpr == NULL) {
pCxt->errCode = terrno;
return DEAL_RES_ERROR;
}
nodesDestroyNode(*pNode);
*pNode = pExpr;
}
}
}
}
return DEAL_RES_IGNORE_CHILD;
}
return DEAL_RES_CONTINUE;
}
static int32_t mergeProjectsOptimizeImpl(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan, SLogicNode* pProjectNode) {
SProjectLogicNode* pProject = (SProjectLogicNode*)pProjectNode;
SProjectLogicNode* pChild = (SProjectLogicNode*)nodesListGetNode(pProjectNode->pChildren, 0);
SMergeProjectionsContext cxt = {};
nodesRewriteExprs(pChild->pProjections, mergeProjectionsExpr, &cxt);
return TSDB_CODE_SUCCESS;
SLogicNode* pChild = (SLogicNode*)nodesListGetNode(pProjectNode->pChildren, 0);
SMergeProjectionsContext cxt = {.pChildProj = (SProjectLogicNode*)pChild};
nodesRewriteExprs(pProject->pProjections, mergeProjectionsExpr, &cxt);
int32_t code = cxt.errCode;
if (TSDB_CODE_SUCCESS == code) {
if (1 == LIST_LENGTH(pChild->pChildren)) {
SLogicNode* pGrandChild = (SLogicNode*)nodesListGetNode(pChild->pChildren, 0);
code = replaceLogicNode(pLogicSubplan, pChild, pGrandChild);
} else { // no grand child
NODES_CLEAR_LIST(pProjectNode->pChildren);
}
}
if (TSDB_CODE_SUCCESS == code) {
NODES_CLEAR_LIST(pChild->pChildren);
}
nodesDestroyNode((SNode*)pChild);
return code;
}
static int32_t mergeProjectsOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {