Michal Ostrowski 15d48c3205 IMPALA-6661 Make NaN values equal for grouping purposes. ...

Similar to the treatment of NULLs, we want to consider NaN values
as equal when grouping.

- When detecting a NaN in a set of row values, the NaN value must
  be converted to a canonical value - so that all NaN values have
  the same bit-pattern for hashing purposes.

- When doing equality evaluation, floating point types must have
  additional logic to consider NaN values as equal.

- Existing logic for handling NULLs in this way is appropriate for
  triggering this behavior for NaN values.

- Relabel "force null equality" as "inclusive equality" to expand
  the scope of the concept to a more generic form that includes NaN.

Change-Id: I996c4a2e1934fd887046ed0c55457b7285375086
Reviewed-on: http://gerrit.cloudera.org:8080/11535
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Reviewed-by: Michael Ho <kwho@cloudera.com>

2018-11-02 02:59:07 +00:00

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