google.appengine.datastore.datastore_index.MinimalCompositeIndexForQuery

Computes the minimal composite index for this query.

google.appengine.datastore.datastore_index.MinimalCompositeIndexForQuery(
    query, index_defs
)

Unlike datastore_index.CompositeIndexForQuery, this function takes into account indexes that already exist in the system.

Args
query	The datastore_pb.Query to compute suggestions for.
index_defs	A list of datastore_index.Index objects that already exist.

Returns

None if no index is needed, otherwise the minimal index in the form (is_most_efficient, kind, ancestor, properties). Where is_most_efficient is a boolean denoting if the suggested index is the most efficient (i.e., the one returned by datastore_index.CompositeIndexForQuery). kind and ancestor are the same variables returned by datastore_index.CompositeIndexForQuery. properties is a tuple consisting of the prefix and postfix properties returend by datastore_index.CompositeIndexForQuery.