westonpace opened a new pull request #12466:
URL: https://github.com/apache/arrow/pull/12466
New rules. This is somewhat of a short term fix until we address
ARROW-12311.
* If neither projection or projected_schema are given then fetch every
field in the dataset schema
* If projected_schema only is specified then the projection expression is a
field_ref to every field name in projected_schema
* If projection only is specified and bound and it is a make_struct with
simple field_ref's then we create a projected_schema which is just the
names/types from the bound projection expression.
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