Fix ambiguity check in explain's consolidate varimp

[exalate-issue-sync]

In very rare cases we can encode multiple categorical variables to new one hot encoded variables that have the same name. The part of code in explain that was supposed to check for the ambiguity was broken.

Consider the following data frame:

{code:none} a | a.b
----+-----
b.c | c
d | d{code}

when one hot encoding it we would end up with two variables named {{a.b.c}} which could cause issues in the consolidate varimp part of code.

[h2o-ops]

JIRA Issue Details

Jira Issue: PUBDEV-8682
Assignee: Tomas Fryda
Reporter: Tomas Fryda
State: Resolved
Fix Version: 3.36.1.2
Attachments: N/A
Development PRs: Available

[h2o-ops]

Linked PRs from JIRA

#6180