different request variants need different memory profiles (#7664)

ydb/core/tx/columnshard/engines/reader/plain_reader/iterator/context.cpp

@@ -252,16 +252,35 @@ std::shared_ptr<TFetchingScript> TSpecialReadContext::BuildColumnsFetchingPlan(c
 TSpecialReadContext::TSpecialReadContext(const std::shared_ptr<TReadContext>& commonContext)
     : CommonContext(commonContext) {
 
+    ReadMetadata = dynamic_pointer_cast<const TReadMetadata>(CommonContext->GetReadMetadata());
+    Y_ABORT_UNLESS(ReadMetadata);
+    Y_ABORT_UNLESS(ReadMetadata->SelectInfo);
+
+    double kffFilter = 0.45;
+    double kffFetching = 0.45;
+    double kffMerge = 0.10;
+    TString stagePrefix;
+    if (ReadMetadata->GetEarlyFilterColumnIds().size()) {
+        stagePrefix = "EF";
+        kffFilter = 0.7;
+        kffFetching = 0.15;
+        kffMerge = 0.15;
+    } else {
+        stagePrefix = "FO";
+        kffFilter = 0.1;
+        kffFetching = 0.75;
+        kffMerge = 0.15;
+    }
+
     std::vector<std::shared_ptr<NGroupedMemoryManager::TStageFeatures>> stages = { 
-        NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildStageFeatures("FILTER", 0.70 * TGlobalLimits::ScanMemoryLimit),
-        NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildStageFeatures("FETCHING", 0.15 * TGlobalLimits::ScanMemoryLimit),
-        NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildStageFeatures("MERGE", 0.15 * TGlobalLimits::ScanMemoryLimit)
+        NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildStageFeatures(
+            stagePrefix + "::FILTER", kffFilter * TGlobalLimits::ScanMemoryLimit),
+        NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildStageFeatures(
+            stagePrefix + "::FETCHING", kffFetching * TGlobalLimits::ScanMemoryLimit),
+        NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildStageFeatures(stagePrefix + "::MERGE", kffMerge * TGlobalLimits::ScanMemoryLimit)
     };
     ProcessMemoryGuard =
         NGroupedMemoryManager::TScanMemoryLimiterOperator::BuildProcessGuard(CommonContext->GetReadMetadata()->GetTxId(), stages);
-    ReadMetadata = dynamic_pointer_cast<const TReadMetadata>(CommonContext->GetReadMetadata());
-    Y_ABORT_UNLESS(ReadMetadata);
-    Y_ABORT_UNLESS(ReadMetadata->SelectInfo);
 
     auto readSchema = ReadMetadata->GetResultSchema();
     SpecColumns = std::make_shared<TColumnsSet>(TIndexInfo::GetSnapshotColumnIdsSet(), readSchema);