add special '[document]' fieldset

* specially handled like [all] and [docid]
* depends on the document type having a configured fieldset named '[document]'
* should make it possible to run vespa-visit -l '[document]' and get only the
  fields declared inside the document for any and all document types.

1 files changed, 9 insertions, 0 deletions

diff --git a/searchcore/src/vespa/searchcore/proton/server/documentretriever.cpp b/searchcore/src/vespa/searchcore/proton/server/documentretriever.cpp
index 6285f4ce70f..d3778b4d745 100644
--- a/searchcore/src/vespa/searchcore/proton/server/documentretriever.cpp
+++ b/searchcore/src/vespa/searchcore/proton/server/documentretriever.cpp
@@ -127,6 +127,7 @@ DocumentRetriever::needFetchFromDocStore(const FieldSet & fieldSet) const {
         case FieldSet::Type::NONE:
         case FieldSet::Type::DOCID:
             return false;
+        case FieldSet::Type::DOCUMENT_ONLY:
         case FieldSet::Type::ALL:
             return ! _areAllFieldsAttributes;
         case FieldSet::Type::FIELD: {
@@ -257,6 +258,14 @@ DocumentRetriever::getPartialDocument(search::DocumentIdT lid, const document::D
                 populate(lid, *doc, set.getFields());
                 break;
             }
+            case FieldSet::Type::DOCUMENT_ONLY: {
+                const auto * actual = getDocumentType().getFieldSet(document::DocumentOnly::NAME);
+                if (actual != nullptr) {
+                    const auto &set = actual->asCollection();
+                    populate(lid, *doc, set.getFields());
+                }
+                break;
+            }
             case FieldSet::Type::NONE:
             case FieldSet::Type::DOCID:
                 break;