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feat: add merge projects optimization

This commit is contained in:
slzhou 2022-06-27 19:07:37 +08:00
parent 4a2018d9c4
commit 8088b67dc9
1 changed files with 42 additions and 0 deletions
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42
source/libs/planner/src/planOptimizer.c
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@ -1235,6 +1235,45 @@ static int32_t eliminateSetOpOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLo
return eliminateSetOpOptimizeImpl(pCxt, pLogicSubplan, pSetOpNode); return eliminateSetOpOptimizeImpl(pCxt, pLogicSubplan, pSetOpNode);
} }
//===================================================================================================================
// merge projects
static bool mergeProjectsMayBeOptimized(SLogicNode* pNode) {
if (QUERY_NODE_LOGIC_PLAN_PROJECT != nodeType(pNode) || 1 != LIST_LENGTH(pNode->pChildren)) {
return false;
}
SLogicNode *pChild = (SLogicNode*)nodesListGetNode(pNode->pChildren, 0);
if (QUERY_NODE_LOGIC_PLAN_PROJECT != nodeType(pChild) || 1 < LIST_LENGTH(pChild->pChildren) ||
NULL != pChild->pConditions || NULL != pNode->pLimit || NULL != pNode->pSlimit) {
return false;
}
return true;
}
typedef struct SMergeProjectionsContext {
} SMergeProjectionsContext;
static EDealRes mergeProjectionsExpr(SNode** pNode, void* pContext) {
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;
}
static int32_t mergeProjectsOptimize(SOptimizeContext* pCxt, SLogicSubplan* pLogicSubplan) {
SLogicNode* pProjectNode = optFindPossibleNode(pLogicSubplan->pNode, mergeProjectsMayBeOptimized);
if (NULL == pProjectNode) {
return TSDB_CODE_SUCCESS;
}
return mergeProjectsOptimizeImpl(pCxt, pLogicSubplan, pProjectNode);
}
// clang-format off // clang-format off
static const SOptimizeRule optimizeRuleSet[] = { static const SOptimizeRule optimizeRuleSet[] = {
{.pName = "OptimizeScanData", .optimizeFunc = osdOptimize}, {.pName = "OptimizeScanData", .optimizeFunc = osdOptimize},
@ -1242,8 +1281,11 @@ static const SOptimizeRule optimizeRuleSet[] = {
{.pName = "OrderByPrimaryKey", .optimizeFunc = opkOptimize}, {.pName = "OrderByPrimaryKey", .optimizeFunc = opkOptimize},
{.pName = "SmaIndex", .optimizeFunc = smaOptimize}, {.pName = "SmaIndex", .optimizeFunc = smaOptimize},
{.pName = "PartitionTags", .optimizeFunc = partTagsOptimize}, {.pName = "PartitionTags", .optimizeFunc = partTagsOptimize},
{.pName = "MergeProjects", .optimizeFunc = mergeProjectsOptimize},
{.pName = "EliminateProject", .optimizeFunc = eliminateProjOptimize}, {.pName = "EliminateProject", .optimizeFunc = eliminateProjOptimize},
{.pName = "EliminateSetOperator", .optimizeFunc = eliminateSetOpOptimize} {.pName = "EliminateSetOperator", .optimizeFunc = eliminateSetOpOptimize}
{.pName = "EliminateSetOperator", .optimizeFunc = eliminateSetOpOptimize},
{.pName = "RewriteTail", .optimizeFunc = rewriteTailOptimize},
}; };
// clang-format on // clang-format on