fix(core): make table normalization 9.2-compatible

[deepyaman]

In response to breaking change (adding DropColumns) in ibis-project/ibis#9440

[jcrist]

Tiny nit, take it or leave it.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.93%. Comparing base (722c448) to head (5eb34fd).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #130   +/-   ##
=======================================
  Coverage   84.92%   84.93%           
=======================================
  Files          26       26           
  Lines        1917     1918    +1     
=======================================
+ Hits         1628     1629    +1     
  Misses        289      289           

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[deepyaman]

FYI @jitingxu1 I want to wait to see if ibis-project/ibis#9677 is accepted before merging; if not, I'll remove the comment around reverting to .equals down the road.

[jitingxu1]

FYI @jitingxu1 I want to wait to see if ibis-project/ibis#9677 is accepted; if not, I'll remove the comment around reverting to .equals down the road.

Thank you so much for your quick fix.