Panic/dropped data when reading parquet files with incompatible shemas

[alamb]

@thinkharderdev added the ability to read from multiple parquet files that have different schemas in #1622

However, if some of the files have "incompatible" schemas (e.g. a different type), the data can be ignored from that file.

Expected behavior would be to have the plan actually return an error rather than silently ignored.

the issue is that the panic is on the reader thread. In effect it basically just causes the read on that partition to get dropped. We could test for a panic by calling read_partition directly from the test if you'd rather do it that way.

Originally posted by @thinkharderdev in #1622 (comment)