clintropolis opened a new pull request, #18760:
URL: https://github.com/apache/druid/pull/18760

   ### Description
   changes:
   * added `DimensionSchema.canBeMultiValued()`, defaulting to false but true 
for `StringDimensionSchema` and `NewSpatialDimensionSchema`
   * `CompactionTask.identifyMultiValuedDimensions` now checks 
`DimensionSchema.canBeMultiValued()` instead of checking for 
`ColumnType.STRING` from `DimensionSchema.getColumnType()`
   * added test to confirm behavior using `AutoTypeColumnSchema` with a 
specified `castToType` of `ColumnType.STRING`, which prior to changes would 
identify as multi-valued despite auto never producing them
   


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