don't return childrenExist prop for databases (ydb-platform#15297)

Author: adameat

ydb/core/tx/schemeshard/schemeshard_path_describer.cpp

@@ -176,7 +176,10 @@ void TPathDescriber::FillChildDescr(NKikimrSchemeOp::TDirEntry* descr, TPathElem
         descr->SetCreateStep(ui64(pathEl->StepCreated));
     }
 
-    descr->SetChildrenExist(pathEl->GetAliveChildren() > 0);
+    if (pathEl->PathType != NKikimrSchemeOp::EPathTypeSubDomain
+        && pathEl->PathType != NKikimrSchemeOp::EPathTypeExtSubDomain) {
+        descr->SetChildrenExist(pathEl->GetAliveChildren() > 0);
+    }
 
     if (pathEl->PathType == NKikimrSchemeOp::EPathTypePersQueueGroup) {
         auto it = Self->Topics.FindPtr(pathEl->PathId);

ydb/core/viewer/tests/canondata/result.json

@@ -1724,7 +1724,6 @@
                     },
                     {
                         "ACL": "",
-                        "ChildrenExist": false,
                         "CreateFinished": true,
                         "CreateStep": "not-zero-number-text",
                         "CreateTxId": "not-zero-number-text",
@@ -1738,7 +1737,6 @@
                     },
                     {
                         "ACL": "",
-                        "ChildrenExist": false,
                         "CreateFinished": true,
                         "CreateStep": "not-zero-number-text",
                         "CreateTxId": "not-zero-number-text",
@@ -1752,7 +1750,6 @@
                     },
                     {
                         "ACL": "",
-                        "ChildrenExist": false,
                         "CreateFinished": true,
                         "CreateStep": "not-zero-number-text",
                         "CreateTxId": "not-zero-number-text",
@@ -1980,7 +1977,6 @@
                 },
                 "Self": {
                     "ACL": "",
-                    "ChildrenExist": true,
                     "CreateFinished": true,
                     "CreateStep": "0",
                     "CreateTxId": "not-zero-number-text",
@@ -2061,7 +2057,6 @@
                 },
                 "Self": {
                     "ACL": "",
-                    "ChildrenExist": false,
                     "CreateFinished": true,
                     "CreateStep": "0",
                     "CreateTxId": "not-zero-number-text",
@@ -2158,7 +2153,6 @@
                 },
                 "Self": {
                     "ACL": "",
-                    "ChildrenExist": true,
                     "CreateFinished": true,
                     "CreateStep": "0",
                     "CreateTxId": "not-zero-number-text",