compat: numpy 2.5.0 (#981)

Author: hoxbro

fastparquet/converted_types.py

@@ -34,7 +34,7 @@ def tobson(x):
 # Explicitly use numpy type in order to avoid promotion errors due to NEP 50 in numpy >= 2
 DAYS_TO_NANOS = np.int64(86400000000000)
 """Number of nanoseconds in a day. Used to convert a Date to a date"""
-nat = np.datetime64('NaT').view('int64')
+nat = np.int64(-9223372036854775808)  # np.datetime64('NaT').view('int64')
 
 simple = {
     parquet_thrift.Type.INT32: np.dtype('int32'),

fastparquet/writer.py

@@ -27,7 +27,7 @@
 MARKER = b'PAR1'
 ROW_GROUP_SIZE = 50_000_000
 NaT = np.timedelta64(None).tobytes()  # require numpy version >= 1.7
-nat = np.datetime64('NaT').view('int64')
+nat = np.int64(-9223372036854775808)  # np.datetime64('NaT').view('int64')
 
 typemap = {  # primitive type, converted type, bit width
     'boolean': (parquet_thrift.Type.BOOLEAN, None, 1),