[SPARK-18167][SQL] Also log all partitions when the SQLQuerySuite test flakes

## What changes were proposed in this pull request?

One possibility for this test flaking is that we have corrupted the partition schema somehow in the tests, which causes the cast to decimal to fail in the call. This should at least show us the actual partition values.

## How was this patch tested?

Run it locally, it prints out something like `ArrayBuffer(test(partcol=0), test(partcol=1), test(partcol=2), test(partcol=3), test(partcol=4))`.

Author: Eric Liang <ekl@databricks.com>

Closes #15701 from ericl/print-more-info.