srowen opened a new pull request #26748: [SPARK-29392][CORE][SQL][FOLLOWUP] 
Avoid deprecated (in 2.13) Symbol syntax 'foo in favor of simpler expression, 
where it generated deprecation warnings
   ### What changes were proposed in this pull request?
   Where it generates a deprecation warning in Scala 2.13, replace Symbol 
shorthand syntax `'foo` with an equivalent.
   ### Why are the changes needed?
   Symbol syntax `'foo` is deprecated in Scala 2.13. The lines changed below 
otherwise generate about 440 warnings when building for 2.13.
   The previous PR directly replaced many usages with `Symbol("foo")`. But it's 
also used to specify Columns via implicit conversion (`.select('foo)`) or even 
where simple Strings are used (`.as('foo)`), as it's kind of an abstraction for 
interned Strings.
   While I find this syntax confusing and would like to deprecate it, here I 
just replaced it where it generates a build warning (not sure why all 
occurrences don't): `$"foo"` or just `"foo"`.
   ### Does this PR introduce any user-facing change?
   Should not change behavior.
   ### How was this patch tested?
   Existing tests.

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