*NOT FOR MERGING* AdamContext.adamRecordsRegionParquetLoad method and failing test.

@fnothaft -- Frank, here's my and Carl's follow-up from our email discussion the other day.  This pull request isn't *actually* meant to be merged, it's an example of what we'd like to write but don't think we can.  

AdamContext.adamRecordsRegionParquetLoad contains an example of the kind of pushdown predicate we'd *like* to write, but can't (because of the way that Parquet is written).  In the end, it seems, all the parameters to a pushdown predicate need to be known at compile time.

Any advice you have for us would be appreciated...