diff --git a/ydb/library/yql/parser/pg_catalog/catalog.cpp b/ydb/library/yql/parser/pg_catalog/catalog.cpp
index 041bb7070489..459290aa46ec 100644
--- a/ydb/library/yql/parser/pg_catalog/catalog.cpp
+++ b/ydb/library/yql/parser/pg_catalog/catalog.cpp
@@ -2551,10 +2551,15 @@ TMaybe<TIssue> LookupCommonType(const TVector<ui32>& typeIds, const std::functio
 
     const auto& catalog = TCatalog::Instance();
 
-    const TTypeDesc* commonType = &LookupType(typeIds[0]);
-    char commonCategory = commonType->Category;
-    size_t unknownsCnt = (commonType->TypeId == UnknownOid) ? 1 : 0;
+    size_t unknownsCnt = (typeIds[0] == UnknownOid || typeIds[0] == InvalidOid) ? 1 : 0;
     castsNeeded = (unknownsCnt != 0);
+    const TTypeDesc* commonType = nullptr;
+    char commonCategory = 0;
+    if (typeIds[0] != InvalidOid) {
+        commonType = &LookupType(typeIds[0]);
+        commonCategory = commonType->Category;
+    }
+
     size_t i = 1;
     for (auto typeId = typeIds.cbegin() + 1; typeId != typeIds.cend(); ++typeId, ++i) {
         if (*typeId == UnknownOid || *typeId == InvalidOid) {
@@ -2562,11 +2567,11 @@ TMaybe<TIssue> LookupCommonType(const TVector<ui32>& typeIds, const std::functio
             castsNeeded = true;
             continue;
         }
-        if (Y_LIKELY(*typeId == commonType->TypeId)) {
+        if (commonType && *typeId == commonType->TypeId) {
             continue;
         }
         const TTypeDesc& otherType = LookupType(*typeId);
-        if (commonType->TypeId == UnknownOid) {
+        if (!commonType || commonType->TypeId == UnknownOid) {
             commonType = &otherType;
             commonCategory = otherType.Category;
             continue;
diff --git a/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp b/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp
index 64f2a91c7e29..2ca8da6286ed 100644
--- a/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp
+++ b/ydb/library/yql/parser/pg_wrapper/comp_factory.cpp
@@ -298,8 +298,10 @@ class TPgTableContent : public TMutableComputationNode<TPgTableContent> {
                     {"oid", [](const NPg::TTypeDesc& desc) { return ScalarDatumToPod(ObjectIdGetDatum(desc.TypeId)); }},
                     {"typname", [](const NPg::TTypeDesc& desc) { return PointerDatumToPod((Datum)(MakeFixedString(desc.Name, NAMEDATALEN))); }},
                     {"typinput", [](const NPg::TTypeDesc& desc) { return ScalarDatumToPod(ObjectIdGetDatum(desc.InFuncId)); }},
-                    {"typnamespace", [](const NPg::TTypeDesc& desc) { return ScalarDatumToPod(ObjectIdGetDatum(1)); }},
+                    {"typnamespace", [](const NPg::TTypeDesc& desc) { return ScalarDatumToPod(ObjectIdGetDatum(PG_CATALOG_NAMESPACE)); }},
                     {"typtype", [](const NPg::TTypeDesc& desc) { return ScalarDatumToPod(CharGetDatum(desc.TypType)); }},
+                    {"typrelid", [](const NPg::TTypeDesc&) { return ScalarDatumToPod(ObjectIdGetDatum(0)); }},
+                    {"typelem", [](const NPg::TTypeDesc& desc) { return ScalarDatumToPod(ObjectIdGetDatum(desc.ElementTypeId)); }},
                 };
 
                 ApplyFillers(AllPgTypeFillers, Y_ARRAY_SIZE(AllPgTypeFillers), PgTypeFillers_);
diff --git a/ydb/library/yql/sql/pg/pg_sql.cpp b/ydb/library/yql/sql/pg/pg_sql.cpp
index 2f5f2871a0c3..88ba8b9c03dd 100644
--- a/ydb/library/yql/sql/pg/pg_sql.cpp
+++ b/ydb/library/yql/sql/pg/pg_sql.cpp
@@ -3489,6 +3489,10 @@ class TConverter : public IPGParseEvents {
         }
 
         auto name = names.back();
+        if (name == "shobj_description" || name == "obj_description") {
+            AddWarning(TIssuesIds::PG_COMPAT, name + " function forced to NULL");
+            return L(A("Null"));
+        }
 
         const bool isAggregateFunc = NYql::NPg::HasAggregation(name, NYql::NPg::EAggKind::Normal);
         const bool hasReturnSet = NYql::NPg::HasReturnSetProc(name);
diff --git a/ydb/library/yql/tests/sql/yt_native_file/part15/canondata/result.json b/ydb/library/yql/tests/sql/yt_native_file/part15/canondata/result.json
index e5ce8f78135c..95aabde220dc 100644
--- a/ydb/library/yql/tests/sql/yt_native_file/part15/canondata/result.json
+++ b/ydb/library/yql/tests/sql/yt_native_file/part15/canondata/result.json
@@ -2077,9 +2077,9 @@
     ],
     "test.test[pg_catalog-pg_set_config_commit-default.txt-Results]": [
         {
-            "checksum": "c5e95bb55bee121d984dcc8030c0d078",
-            "size": 81034,
-            "uri": "https://{canondata_backend}/1889210/12eb3d6135cc7c142c46c4cbdc538bcd42612711/resource.tar.gz#test.test_pg_catalog-pg_set_config_commit-default.txt-Results_/results.txt"
+            "checksum": "ab42d523f46bbb78b5e444f284263844",
+            "size": 81420,
+            "uri": "https://{canondata_backend}/1937027/6d104b7ff295cd850e83985304b58019e03b127c/resource.tar.gz#test.test_pg_catalog-pg_set_config_commit-default.txt-Results_/results.txt"
         }
     ],
     "test.test[pragma-yson_auto_convert--Debug]": [
diff --git a/ydb/library/yql/tests/sql/yt_native_file/part19/canondata/result.json b/ydb/library/yql/tests/sql/yt_native_file/part19/canondata/result.json
index 2c002dcdd284..d14eec0334b4 100644
--- a/ydb/library/yql/tests/sql/yt_native_file/part19/canondata/result.json
+++ b/ydb/library/yql/tests/sql/yt_native_file/part19/canondata/result.json
@@ -2141,9 +2141,9 @@
     ],
     "test.test[pg_catalog-pg_type_syntax_pg-default.txt-Results]": [
         {
-            "checksum": "8ddfa3db17f5dcc174f50a8a48e991b9",
-            "size": 40518,
-            "uri": "https://{canondata_backend}/1942671/21ee0e4e2b05b4a7ec7dc41bfc2f5222bf683757/resource.tar.gz#test.test_pg_catalog-pg_type_syntax_pg-default.txt-Results_/results.txt"
+            "checksum": "b0ed9f922a8c9c665672975ad872eed3",
+            "size": 40711,
+            "uri": "https://{canondata_backend}/1937027/e4c43dd0a3435b6e080492799b1e73594f48a97d/resource.tar.gz#test.test_pg_catalog-pg_type_syntax_pg-default.txt-Results_/results.txt"
         }
     ],
     "test.test[pg_catalog-pg_type_syntax_yql-default.txt-Debug]": [
diff --git a/ydb/library/yql/tests/sql/yt_native_file/part4/canondata/result.json b/ydb/library/yql/tests/sql/yt_native_file/part4/canondata/result.json
index adab475bd9cf..3f409c37dd44 100644
--- a/ydb/library/yql/tests/sql/yt_native_file/part4/canondata/result.json
+++ b/ydb/library/yql/tests/sql/yt_native_file/part4/canondata/result.json
@@ -1820,9 +1820,9 @@
     ],
     "test.test[pg_catalog-pg_set_config-default.txt-Results]": [
         {
-            "checksum": "b536ee2489e572348ea35bda8c0ec0d4",
-            "size": 81034,
-            "uri": "https://{canondata_backend}/1031349/7b09580c71768591c522e0563c532a885c6a950b/resource.tar.gz#test.test_pg_catalog-pg_set_config-default.txt-Results_/results.txt"
+            "checksum": "34d9e7ccdc8bba742382ff43564d2a3f",
+            "size": 81420,
+            "uri": "https://{canondata_backend}/1923547/5c44f09f92b4654efde265edfb30dedf7811c9ed/resource.tar.gz#test.test_pg_catalog-pg_set_config-default.txt-Results_/results.txt"
         }
     ],
     "test.test[produce-reduce_all-default.txt-Debug]": [