Commits on Jul 21, 2023

1. Remove the erroneous "empty level" short-circuit from ORC reader (#13722 …

   )
   
   Closes #13709
   
   ORC reader skips some decode steps in the corner case where a column hierarchy level contains no data (e.g. struct with no validity mask).
   However, some of the skipped steps might still be required; for example, null masks need to the propagated to the child columns.
   
   This PR removes the short-circuit in the corner case, allowing correct decode when null masks need to be propagated.
   This PR also moves creation of the time zone table out of the level-by-level loop, as it can just be reused at all levels.
   
   Authors:
     - Vukasin Milovanovic (https://github.com/vuule)
   
   Approvers:
     - Bradley Dice (https://github.com/bdice)
     - Divye Gala (https://github.com/divyegala)
   
   URL: #13722

   

   vuule authored Jul 21, 2023
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