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Commit cd48ca50 authored by Michael Armbrust's avatar Michael Armbrust
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[SPARK-6145][SQL] fix ORDER BY on nested fields

This PR is based on work by cloud-fan in #4904, but with two differences:
 - We isolate the logic for Sort's special handling into `ResolveSortReferences`
 - We avoid creating UnresolvedGetField expressions during resolution.  Instead we either resolve GetField or we return None.  This avoids us going down the wrong path early on.

Author: Michael Armbrust <michael@databricks.com>

Closes #5189 from marmbrus/nestedOrderBy and squashes the following commits:

b8cae45 [Michael Armbrust] fix another test
0f36a11 [Michael Armbrust] WIP
91820cd [Michael Armbrust] Fix bug.
parent 81020144
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