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Benjamin KietzmanKrisztián Szűcs
200e3087a29
Benjamin Kietzman authored and Krisztián Szűcs committed b8ebc9d41b1
ARROW-6475: [C++] Don't try to dictionary encode dictionary arrays

With #5077 (or possibly #4949) behavior with dictionary arrays changed, leaving the explicit call to DictionaryEncode() redundant @wesm

Closes #5299 from bkietz/6434-Crossbow-Nightly-HDFS-int and squashes the following commits:

b29e6b732 <Benjamin Kietzman> don't try to dictionary encode dictionary arrays

Authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Signed-off-by: Krisztián Szűcs <szucs.krisztian@gmail.com>