Fix mounts.txt. Improve diagnostics

commit_hash:3c3bc0fb4bcf949a90d2646b27f93b9ed580328d

Author: nepal

yql/essentials/core/yql_aggregate_expander.cpp

@@ -127,8 +127,9 @@ TExprNode::TPtr TAggregateExpander::ExpandAggApply(const TExprNode::TPtr& node)
         return ExpandPgAggregationTraits(node->Pos(), *aggDescPtr, false, node->ChildPtr(2), argTypes, itemType, Ctx);
     }
 
-    auto exportsPtr = TypesCtx.Modules->GetModule("/lib/yql/aggregate.yql");
-    YQL_ENSURE(exportsPtr);
+    const TString modulePath = "/lib/yql/aggregate.yql";
+    auto exportsPtr = TypesCtx.Modules->GetModule(modulePath);
+    YQL_ENSURE(exportsPtr, "Failed to get module " << modulePath);
     const auto& exports = exportsPtr->Symbols();
     const auto ex = exports.find(TString(name) + "_traits_factory");
     YQL_ENSURE(exports.cend() != ex);
@@ -605,7 +606,7 @@ TExprNode::TPtr TAggregateExpander::MakeInputBlocks(const TExprNode::TPtr& strea
         TVector<TExprNode::TPtr> roots;
         for (ui32 i = 1; i < argsCount + 1; ++i) {
             auto root = trait->Child(2)->ChildPtr(i);
-            allTypes.push_back(root->GetTypeAnn());            
+            allTypes.push_back(root->GetTypeAnn());
 
             auto status = RemapExpr(root, root, remaps, Ctx, TOptimizeExprSettings(&TypesCtx));
 
@@ -699,7 +700,7 @@ TExprNode::TPtr TAggregateExpander::TryGenerateBlockCombineAllOrHashed() {
     } else {
         stream = AggList;
     }
-    
+
     TExprNode::TPtr blocks = MakeInputBlocks(stream, keyIdxs, outputColumns, aggs, false, false);
     if (!blocks) {
         return nullptr;