diff --git a/ydb/library/yql/providers/yt/provider/yql_yt_physical_optimize.cpp b/ydb/library/yql/providers/yt/provider/yql_yt_physical_optimize.cpp
index d8276407daf9..3e4db1e71fbb 100644
--- a/ydb/library/yql/providers/yt/provider/yql_yt_physical_optimize.cpp
+++ b/ydb/library/yql/providers/yt/provider/yql_yt_physical_optimize.cpp
@@ -7435,6 +7435,14 @@ class TYtPhysicalOptProposalTransformer : public TOptimizeTransformerBase {
         if (!rowSpec.IsSorted()) {
             return node;
         }
+        TMaybeNode<TExprBase> columns;
+        if (rowSpec.HasAuxColumns()) {
+            TSet<TStringBuf> members;
+            for (auto item: rowSpec.GetType()->GetItems()) {
+                members.insert(item->GetName());
+            }
+            columns = TExprBase(ToAtomList(members, merge.Pos(), ctx));
+        }
 
         auto mergeSection = merge.Input().Item(0);
         if (NYql::HasSettingsExcept(mergeSection.Settings().Ref(), EYtSettingType::KeyFilter | EYtSettingType::KeyFilter2)) {
@@ -7467,7 +7475,10 @@ class TYtPhysicalOptProposalTransformer : public TOptimizeTransformerBase {
                         .Input()
                             .Add()
                                 .Paths()
-                                    .Add(path)
+                                    .Add<TYtPath>()
+                                        .InitFrom(path)
+                                        .Columns(columns.IsValid() ? columns.Cast() : path.Columns())
+                                    .Build()
                                 .Build()
                                 .Settings(section.Settings())
                             .Build()
diff --git a/ydb/library/yql/tests/sql/sql2yql/canondata/result.json b/ydb/library/yql/tests/sql/sql2yql/canondata/result.json
index 5d5be56f2e8e..9c785c6ed7e2 100644
--- a/ydb/library/yql/tests/sql/sql2yql/canondata/result.json
+++ b/ydb/library/yql/tests/sql/sql2yql/canondata/result.json
@@ -10079,6 +10079,13 @@
             "uri": "https://{canondata_backend}/995452/54c61b947dc9448707d2846976eec313612f5c1d/resource.tar.gz#test_sql2yql.test_optimizers-yql-17413-topsort_/sql.yql"
         }
     ],
+    "test_sql2yql.test[optimizers-yql-17715_concat_sort_desc]": [
+        {
+            "checksum": "baa57aee8a488863a299111fbbcb7649",
+            "size": 9265,
+            "uri": "https://{canondata_backend}/1814674/63e551151efd4c97040b5a29864cd326559dea48/resource.tar.gz#test_sql2yql.test_optimizers-yql-17715_concat_sort_desc_/sql.yql"
+        }
+    ],
     "test_sql2yql.test[optimizers-yql-2171_aggregate_desc_sort_and_extract]": [
         {
             "checksum": "e46724f353c724da2d05f34ac86ebc12",
@@ -27558,6 +27565,13 @@
             "uri": "https://{canondata_backend}/995452/54c61b947dc9448707d2846976eec313612f5c1d/resource.tar.gz#test_sql_format.test_optimizers-yql-17413-topsort_/formatted.sql"
         }
     ],
+    "test_sql_format.test[optimizers-yql-17715_concat_sort_desc]": [
+        {
+            "checksum": "c644b0dfcbb6e77f508129b548b94f16",
+            "size": 1181,
+            "uri": "https://{canondata_backend}/1942525/7ef0cd1bc632788b3cc025a801fdee39a608567b/resource.tar.gz#test_sql_format.test_optimizers-yql-17715_concat_sort_desc_/formatted.sql"
+        }
+    ],
     "test_sql_format.test[optimizers-yql-2171_aggregate_desc_sort_and_extract]": [
         {
             "checksum": "ea7ad8b12dbf78644e2a7ac94e10159b",
diff --git a/ydb/library/yql/tests/sql/suites/optimizers/yql-17715_concat_sort_desc.cfg b/ydb/library/yql/tests/sql/suites/optimizers/yql-17715_concat_sort_desc.cfg
new file mode 100644
index 000000000000..bb349dd8abdd
--- /dev/null
+++ b/ydb/library/yql/tests/sql/suites/optimizers/yql-17715_concat_sort_desc.cfg
@@ -0,0 +1 @@
+providers yt
diff --git a/ydb/library/yql/tests/sql/suites/optimizers/yql-17715_concat_sort_desc.sql b/ydb/library/yql/tests/sql/suites/optimizers/yql-17715_concat_sort_desc.sql
new file mode 100644
index 000000000000..10cae73c84d1
--- /dev/null
+++ b/ydb/library/yql/tests/sql/suites/optimizers/yql-17715_concat_sort_desc.sql
@@ -0,0 +1,43 @@
+use plato;
+
+$min_ts_for_stat_calculation = DateTime::ToSeconds(CurrentUtcDate() - Interval("P1D"));
+
+insert into @a
+select * from (
+    select 1ul as puid, CurrentUtcTimestamp() as timestamp, [1, 2] as segments, "a" as dummy1
+)
+assume order by puid, timestamp desc;
+
+insert into @b
+select * from (
+    select 4ul as puid, CurrentUtcTimestamp() as timestamp, [3, 2] as segments, "a" as dummy1
+)
+assume order by puid, timestamp desc;
+
+insert into @c
+select * from (
+    select 2ul as puid, Just(CurrentUtcTimestamp()) as timestamp, [2, 3] as segments, "a" as dummy2
+)
+assume order by puid, timestamp desc;
+
+commit;
+
+$target_events = (
+    SELECT
+        puid,
+        segments
+    FROM CONCAT(@a, @b, @c)
+    where DateTime::ToSeconds(`timestamp`) > $min_ts_for_stat_calculation
+);
+
+$target_events = (
+    SELECT DISTINCT *
+    FROM (
+        SELECT *
+        FROM $target_events
+        FLATTEN LIST BY segments
+    )
+    FLATTEN COLUMNS
+);
+
+SELECT * FROM $target_events ORDER BY puid, segments;
diff --git a/ydb/library/yql/tests/sql/yt_native_file/part13/canondata/result.json b/ydb/library/yql/tests/sql/yt_native_file/part13/canondata/result.json
index d897cd4e4d2d..80a65d613e4e 100644
--- a/ydb/library/yql/tests/sql/yt_native_file/part13/canondata/result.json
+++ b/ydb/library/yql/tests/sql/yt_native_file/part13/canondata/result.json
@@ -1548,6 +1548,27 @@
             "uri": "https://{canondata_backend}/212715/e1bc1d6e31fa656365a738e65224a7c3f774bae6/resource.tar.gz#test.test_optimizers-yql-14279_keyextract_with_world_dep--Results_/results.txt"
         }
     ],
+    "test.test[optimizers-yql-17715_concat_sort_desc--Debug]": [
+        {
+            "checksum": "9e3b07bd7f0d4ca1ed0449a35e10c886",
+            "size": 8178,
+            "uri": "https://{canondata_backend}/1031349/6ede2a86394410e62bf37c82ccf18a1c63b00a6b/resource.tar.gz#test.test_optimizers-yql-17715_concat_sort_desc--Debug_/opt.yql"
+        }
+    ],
+    "test.test[optimizers-yql-17715_concat_sort_desc--Plan]": [
+        {
+            "checksum": "933d7040c97424d9408fbf5f81cdbf12",
+            "size": 20858,
+            "uri": "https://{canondata_backend}/1031349/6ede2a86394410e62bf37c82ccf18a1c63b00a6b/resource.tar.gz#test.test_optimizers-yql-17715_concat_sort_desc--Plan_/plan.txt"
+        }
+    ],
+    "test.test[optimizers-yql-17715_concat_sort_desc--Results]": [
+        {
+            "checksum": "3568406b16079b54adbd0eab508c7ede",
+            "size": 1467,
+            "uri": "https://{canondata_backend}/1031349/6ede2a86394410e62bf37c82ccf18a1c63b00a6b/resource.tar.gz#test.test_optimizers-yql-17715_concat_sort_desc--Results_/results.txt"
+        }
+    ],
     "test.test[optimizers-yson_dup_serialize--Debug]": [
         {
             "checksum": "d4c9ddd001cf2586aa1613ad3d6792c7",