- 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)