- Update to 12.0.0
  * Run-End Encoded Arrays have been implemented and are accessible
    (GH-32104)
  * The FixedShapeTensor Logical value type has been implemented
    using ExtensionType (GH-15483, GH-34796)
  ## Compute
  * New kernel to convert timestamp with timezone to wall time
    (GH-33143)
  * Cast kernels are now built into libarrow by default (GH-34388)
  ## Acero
  * Acero has been moved out of libarrow into it’s own shared
    library, allowing for smaller builds of the core libarrow
    (GH-15280)
  * Exec nodes now can have a concept of “ordering” and will reject
    non-sensible plans (GH-34136)
  * New exec nodes: “pivot_longer” (GH-34266), “order_by”
    (GH-34248) and “fetch” (GH-34059)
  * Breaking Change: Reorder output fields of “group_by” node so
    that keys/segment keys come before aggregates (GH-33616)
  ## Substrait
  * Add support for the round function GH-33588
  * Add support for the cast expression element GH-31910
  * Added API reference documentation GH-34011
  * Added an extension relation to support segmented aggregation
    GH-34626
  * The output of the aggregate relation now conforms to the spec
    GH-34786
  ## Parquet
  * Added support for DeltaLengthByteArray encoding to the Parquet
    writer (GH-33024) (forwarded request 1087839 from bnavigator)

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