Github user HyukjinKwon commented on the issue: https://github.com/apache/spark/pull/19389 > why the tests are all going into `ParquetPartitionDiscoverySuite` -- this doesn't seem specific to parquet, and in fact I wonder if it will be different in parquet since the non-partition columns have schemas specified in the data. I'm just surprised this isn't tested across more formats. Yea, I agree since this problem is not specific to Parquet. Here, such changes and test cases look added in this file so far and I simply just decided to follow it, rather than including changes here restructuing or moving the test cases, partly for the easy of backporting (we should backport this into branch-2.2 and 2.1) and partly to reduce reviewing cost.
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