Enable MemberNthOverFlatMap by default

commit_hash:5117342b91cba57f7c45d262b1c95aea6a65061a

Author: nepal

yql/essentials/core/common_opt/yql_co_simple1.cpp

@@ -3725,7 +3725,7 @@ TExprNode::TPtr MemberNthOverFlatMapWithOptional(const TExprNode::TPtr& node, TE
     YQL_ENSURE(node->IsCallable({"Member", "Nth"}));
     YQL_ENSURE(optCtx.Types);
     static const char optName[] = "MemberNthOverFlatMap";
-    if (!IsOptimizerEnabled<optName>(*optCtx.Types) || IsOptimizerDisabled<optName>(*optCtx.Types)) {
+    if (IsOptimizerDisabled<optName>(*optCtx.Types)) {
         return node;
     }
     if (auto maybeFlatMap = TMaybeNode<TCoFlatMapBase>(node->HeadPtr())) {

yql/essentials/tests/sql/minirun/part4/canondata/result.json

@@ -1074,9 +1074,9 @@
     ],
     "test.test[pg-join_brackets2-default.txt-Debug]": [
         {
-            "checksum": "411ff9e7cbcd6ae448899c02767b8cfd",
-            "size": 11821,
-            "uri": "https://{canondata_backend}/1881367/226940b6d391bb2a80e5edf7b4e5cb1acd6fe46c/resource.tar.gz#test.test_pg-join_brackets2-default.txt-Debug_/opt.yql"
+            "checksum": "762758513e739959f8275294a2dd1130",
+            "size": 11674,
+            "uri": "https://{canondata_backend}/1942100/9612d32b93424452bb3f40592b19e89f4235ecdc/resource.tar.gz#test.test_pg-join_brackets2-default.txt-Debug_/opt.yql"
         }
     ],
     "test.test[pg-join_brackets2-default.txt-Results]": [

yql/essentials/tests/sql/minirun/part9/canondata/result.json

@@ -767,9 +767,9 @@
     ],
     "test.test[join-left_join_with_self_aggr-default.txt-Debug]": [
         {
-            "checksum": "270003dd9cfab29ddd670dfc824c2915",
-            "size": 1938,
-            "uri": "https://{canondata_backend}/1784117/55def1f3663399bc5a3dcaf25f21903f7ce51918/resource.tar.gz#test.test_join-left_join_with_self_aggr-default.txt-Debug_/opt.yql"
+            "checksum": "ff7d2593dd011f79c32819748d958e79",
+            "size": 1857,
+            "uri": "https://{canondata_backend}/1881367/b447b7877567a6d1a91f839b5ff599806e6ee35f/resource.tar.gz#test.test_join-left_join_with_self_aggr-default.txt-Debug_/opt.yql"
         }
     ],
     "test.test[join-left_join_with_self_aggr-default.txt-Results]": [