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.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2022-09-30 UTC."],[[["This function, `MinimalCompositeIndexForQuery`, calculates the smallest composite index required for a given query."],["It differs from `CompositeIndexForQuery` by considering existing indexes in the system."],["The function accepts a `datastore_pb.Query` and a list of existing `datastore_index.Index` objects as arguments."],["It returns `None` if no additional index is needed, or a tuple representing the minimal index, which includes whether it's the most efficient, kind, ancestor, and properties."]]],[]]
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