Correctly determine relation type of OSM chunk as standalone table

[akuzm]

Previously we only handled the case of OSM chunk expanded as a child of hypertable, so in the case of direct select it segfaulted while trying to access an fdw_private which is managed by OSM.

Disable-check: force-changelog-file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.87%. Comparing base (59f50f2) to head (e522b72).
Report is 113 commits behind head on main.

❗ Current head e522b72 differs from pull request most recent head cd6a741. Consider uploading reports for the commit cd6a741 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6840      +/-   ##
==========================================
+ Coverage   80.06%   80.87%   +0.81%     
==========================================
  Files         190      197       +7     
  Lines       37181    37026     -155     
  Branches     9450     9667     +217     
==========================================
+ Hits        29770    29946     +176     
- Misses       2997     3215     +218     
+ Partials     4414     3865     -549     

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[jnidzwetzki]

I am wondering if we could introduce a dummy entry in the catalog to get better test coverage for this kind of chunks. However, this might be out-of-scope of this PR.

[akuzm]

I am wondering if we could introduce a dummy entry in the catalog to get better test coverage for this kind of chunks. However, this might be out-of-scope of this PR.

We do have a test for this that uses postgres_fdw as a kind of OSM chunk replacement. Just added a couple of test cases there.