Do not reorder/change joins for CostBasedOptimizationLevel == 1 (#7077)

Author: Hor911

ydb/core/kqp/opt/logical/kqp_opt_cbo.cpp

@@ -176,13 +176,13 @@ double TKqpProviderContext::ComputeJoinCost(const TOptimizerStatistics& leftStat
 
     switch(joinAlgo) {
         case EJoinAlgoType::LookupJoin:
-            if (OptLevel==1) {
+            if (OptLevel == 2) {
                 return -1;
             }
             return leftStats.Nrows + outputRows;
 
         case EJoinAlgoType::LookupJoinReverse:
-            if (OptLevel==1) {
+            if (OptLevel == 2) {
                 return -1;
             }
             return rightStats.Nrows + outputRows;

ydb/library/yql/dq/opt/dq_cbo_ut.cpp

@@ -222,7 +222,7 @@ void _DqOptimizeEquiJoinWithCosts(const std::function<IOptimizerNew*()>& optFact
         auto rel = std::make_shared<TRelOptimizerNode>(TString(label), stats);
         rels.push_back(rel);
     };
-    auto res = DqOptimizeEquiJoinWithCosts(equiJoin, ctx, typeCtx, 1, *opt, providerCollect);
+    auto res = DqOptimizeEquiJoinWithCosts(equiJoin, ctx, typeCtx, 2, *opt, providerCollect);
     UNIT_ASSERT(equiJoin.Ptr() != res.Ptr());
     UNIT_ASSERT(equiJoin.Ptr()->ChildrenSize() == res.Ptr()->ChildrenSize());
     UNIT_ASSERT(equiJoin.Maybe<TCoEquiJoin>());

ydb/library/yql/dq/opt/dq_opt_join_cost_based.cpp

@@ -277,7 +277,7 @@ TExprBase DqOptimizeEquiJoinWithCosts(
     const TProviderCollectFunction& providerCollect,
     int& equiJoinCounter
 ) {
-    if (optLevel == 0) {
+    if (optLevel <= 1) {
         return node;
     }
 

ydb/library/yql/providers/dq/opt/logical_optimize.cpp

@@ -225,7 +225,7 @@ class TDqsLogicalOptProposalTransformer : public TOptimizeTransformerBase {
                 rels.push_back(rel);
             };
 
-            return DqOptimizeEquiJoinWithCosts(node, ctx, TypesCtx, 1, *opt, providerCollect);
+            return DqOptimizeEquiJoinWithCosts(node, ctx, TypesCtx, 2, *opt, providerCollect);
         } else {
             return node;
         }