Why doesn't an attribute show up in an attribute list?

In the tree, and in certain dialogues (simple query builder, aggregation builder, etc) dbKoda will generate a list of attributes in a collection.  This list may not include all the attributes found in every collection. 

We sample a relatively small number of documents (a couple of hundred ) in a collection to find attributes.  If every collection has the same attributes then all will be well.  However, if there is a lot of variability in the collection then we can't guarantee that all attributes will be found.  You might therefore think of the list as "frequently found attributes".

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