HedgehogCode opened a new pull request #8363:
URL: https://github.com/apache/arrow/pull/8363
When translating between the memory FieldType and message FieldType for
dictionary encoded vectors the children of the dictionary field were not
handled correctly.
* When going from memory format to message format the Field must have the
children of the dictionary field.
* When going from message format to memory format the Field must have no
children but the dictionary must have the mapped children
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