Fix some flakiness in transparent_decompression test

[akuzm]

Add ANALYZE after compression. The plan changes are expected, SeqScans are preferred over IndexScans and Sort over MergeAppend for small tables.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.49%. Comparing base (59f50f2) to head (fae1d37).
Report is 174 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6892      +/-   ##
==========================================
+ Coverage   80.06%   81.49%   +1.42%     
==========================================
  Files         190      198       +8     
  Lines       37181    36484     -697     
  Branches     9450     9528      +78     
==========================================
- Hits        29770    29731      -39     
+ Misses       2997     2820     -177     
+ Partials     4414     3933     -481     

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[antekresic]

Any reason not to merge this? Seems like it would improve things.

[akuzm]

Any reason not to merge this? Seems like it would improve things.

There's still some flakiness that I'm investigating in #6893

So this means this PR is probably going to have some more changes. I plan to merge it first, and then merge the above fix, so that it's more clear what it's changing.