Joris Van den Bossche created ARROW-14286:
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Summary: [Python][Parquet] Allow to select columns of a list field
without requiring the list component names
Key: ARROW-14286
URL: https://issues.apache.org/jira/browse/ARROW-14286
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: Joris Van den Bossche
Subtask for ARROW-14196.
Currently, if you have a list column, where the list elements itself are nested
items (eg a list of structs), selecting a subset of that list column requires
something like {{columns=["columnA.list.item.subfield"]}}. While this
"list.item" is superfluous, since a list always contains a single child. So
ideally we allow to specify this as {{columns=["columnA.subfield"]}}.
This also avoids relying on the exact name of the list item (item vs element),
for which the default differs between Parquet and Arrow.
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