nfsantos commented on code in PR #1398:
URL: https://github.com/apache/jackrabbit-oak/pull/1398#discussion_r1548987562


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oak-run-commons/src/main/java/org/apache/jackrabbit/oak/index/indexer/document/flatfile/pipelined/NodeDocumentCodec.java:
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@@ -81,7 +81,12 @@ public NodeDocument decode(BsonReader reader, DecoderContext 
decoderContext) {
         while (reader.readBsonType() != BsonType.END_OF_DOCUMENT) {
             String fieldName = reader.readName();
             Object value = readValue(reader, fieldName);
-            nodeDocument.put(fieldName, value);
+            // Ignore hidden properties (property name starting with :)
+            // Hidden properties are not indexed and also ignored during async 
index updates.
+            // So it's safe to ignore them while building the FlatFileStore as 
well.
+            if (fieldName.charAt(0) != ':') {

Review Comment:
   I wonder if `fieldName` can ever be empty? The docs of `readName()` do not 
exclude this possibility. If it is empty, this would fail with an exception and 
the whole download would fail. I suggest to had a check for empty, just to be 
sure we are not surprised by empty names. 



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