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FIX: do not cast _FillValue/missing_value in CFMaskCoder if _Unsigned is provided #8852

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Merged
dcherian merged 3 commits into from
Mar 19, 2024
Merged

FIX: do not cast _FillValue/missing_value in CFMaskCoder if _Unsigned is provided #8852

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61a24f2
FIX: do not cast _FillValue/missing_value in CFMaskCoder if _Unsigned…
kmuehlbauer Mar 19, 2024
b0a7f2b
add whats-new.rst entry
kmuehlbauer Mar 19, 2024
82463fe
add comment on _Unsigned
kmuehlbauer Mar 19, 2024
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3 changes: 3 additions & 0 deletions doc/whats-new.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -57,6 +57,9 @@ Bug fixes
`CFMaskCoder`/`CFScaleOffsetCoder` (:issue:`2304`, :issue:`5597`,
:issue:`7691`, :pull:`8713`, see also discussion in :pull:`7654`).
By `Kai Mühlbauer <https://github.com/kmuehlbauer>`_.
- do not cast `_FillValue`/`missing_value` in `CFMaskCoder` if `_Unsigned` is provided
(:issue:`8844`, :pull:`8852`).
By `Kai Mühlbauer <https://github.com/kmuehlbauer>`_.

Documentation
~~~~~~~~~~~~~
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12 changes: 9 additions & 3 deletions xarray/coding/variables.py
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Expand Up @@ -309,6 +309,7 @@ def encode(self, variable: Variable, name: T_Name = None):
dtype = np.dtype(encoding.get("dtype", data.dtype))
fv = encoding.get("_FillValue")
mv = encoding.get("missing_value")
unsigned = encoding.get("_Unsigned") is not None

fv_exists = fv is not None
mv_exists = mv is not None
Expand All @@ -323,13 +324,19 @@ def encode(self, variable: Variable, name: T_Name = None):

if fv_exists:
# Ensure _FillValue is cast to same dtype as data's
encoding["_FillValue"] = dtype.type(fv)
# need to skip this if _Unsigned is available
if not unsigned:
encoding["_FillValue"] = dtype.type(fv)
fill_value = pop_to(encoding, attrs, "_FillValue", name=name)

if mv_exists:
# try to use _FillValue, if it exists to align both values
# or use missing_value and ensure it's cast to same dtype as data's
encoding["missing_value"] = attrs.get("_FillValue", dtype.type(mv))
# need to provide mv verbatim if _Unsigned is available
encoding["missing_value"] = attrs.get(
"_FillValue",
(dtype.type(mv) if not unsigned else mv),
)
fill_value = pop_to(encoding, attrs, "missing_value", name=name)

# apply fillna
Expand Down Expand Up @@ -522,7 +529,6 @@ def encode(self, variable: Variable, name: T_Name = None) -> Variable:
def decode(self, variable: Variable, name: T_Name = None) -> Variable:
if "_Unsigned" in variable.attrs:
dims, data, attrs, encoding = unpack_for_decoding(variable)

unsigned = pop_to(attrs, encoding, "_Unsigned")

if data.dtype.kind == "i":
Expand Down