[SPARK-10534] [SQL] ORDER BY clause allows only columns that are present in...

[SPARK-10534] [SQL] ORDER BY clause allows only columns that are present in the select projection list

Find out the missing attributes by recursively looking
at the sort order expression and rest of the code
takes care of projecting them out.

Added description from cloud-fan

I wanna explain a bit more about this bug.

When we resolve sort ordering, we will use a special method, which only resolves UnresolvedAttributes and UnresolvedExtractValue. However, for something like Floor('a), even the 'a is resolved, the floor expression may still being unresolved as data type mismatch(for example, 'a is string type and Floor need double type), thus can't pass this filter, and we can't push down this missing attribute 'a

Author: Dilip Biswal <dbiswal@us.ibm.com>

Closes #9123 from dilipbiswal/SPARK-10534.