don't use pin_subpackage(..., exact=True) in libarrow run-constraint

recipe/meta.yaml

@@ -208,14 +208,16 @@ outputs:
  run_constrained:
  - apache-arrow-proc =*={{ build_ext }}
  # avoid that libarrow-X & -Y get installed with different builds or even versions;
- # since everything else depends on libarrow, it's enough to enforce this here once
- - {{ pin_subpackage("libarrow-acero", exact=True) }}
- - {{ pin_subpackage("libarrow-dataset", exact=True) }}
- - {{ pin_subpackage("libarrow-flight", exact=True) }}
- - {{ pin_subpackage("libarrow-flight-sql", exact=True) }}
- - {{ pin_subpackage("libarrow-gandiva", exact=True) }}
- - {{ pin_subpackage("libarrow-substrait", exact=True) }}
- - {{ pin_subpackage("libparquet", exact=True) }}
+ # since everything else depends on libarrow, it's enough to enforce this here once;
+ # can't use `pin_subpackage(..., exact=True)` because when libarrow gets built first
+ # (and the metadata populated), the hashes for the other outputs aren't known yet.
+ - libarrow-acero ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
+ - libarrow-dataset ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
+ - libarrow-flight ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
+ - libarrow-flight-sql ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
+ - libarrow-gandiva ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
+ - libarrow-substrait ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
+ - libparquet ={{ version }}=*_{{ PKG_BUILDNUM }}_{{ build_ext }}
  # avoid installation with old naming of lib package
  - arrow-cpp <0.0a0
  # old parquet lib output, now part of this feedstock