24-4-4-hotfix: Don't try checking for merge when operation limit already exceeded (#18554)

Author: snaury

ydb/core/tx/schemeshard/schemeshard__table_stats.cpp

@@ -407,9 +407,11 @@ bool TTxStoreTableStats::PersistSingleStats(const TPathId& pathId,
     const TTableIndexInfo* index = Self->Indexes.Value(pathElement->ParentPathId, nullptr).Get();
     const TTableInfo* mainTableForIndex = Self->GetMainTableForIndex(pathId);
 
+    TString errStr;
     const auto forceShardSplitSettings = Self->SplitSettings.GetForceShardSplitSettings();
     TVector<TShardIdx> shardsToMerge;
     if ((!index || index->State == NKikimrSchemeOp::EIndexStateReady)
+        && Self->CheckInFlightLimit(NKikimrSchemeOp::ESchemeOpSplitMergeTablePartitions, errStr)
         && table->CheckCanMergePartitions(Self->SplitSettings, forceShardSplitSettings, shardIdx, shardsToMerge, mainTableForIndex)
     ) {
         TTxId txId = Self->GetCachedTxId(ctx);