Support predict on Aggregator model

Description

Currently predict not supported with `Aggregator` models:

results in NPE (pending fix PUBDEV-7572).

It does make sense though to associate seen (using save_mapping_frame: true) and unseen rows (using predict) with exemplars discovered by Aggregator model.

Discussed with https://h2oai.slack.com/archives/C446EEZMK/p1590608923063500

Assignee

Michal Kurka

Fix versions

Reporter

Gregory Kanevsky

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Affected Spark version

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Components

Affects versions

Priority

Major
Configure