CLN: remove unused algos_common_helper functions (#44207)

Author: jbrockmendel

pandas/_libs/algos_common_helper.pxi.in

@@ -36,19 +36,19 @@ def ensure_object(object arr):
 
 # name, c_type, dtype
 dtypes = [('float64', 'FLOAT64', 'float64'),
-          ('float32', 'FLOAT32', 'float32'),
+          # ('float32', 'FLOAT32', 'float32'),  # disabling bc unused
           ('int8', 'INT8', 'int8'),
           ('int16', 'INT16', 'int16'),
           ('int32', 'INT32', 'int32'),
           ('int64', 'INT64', 'int64'),
-          ('uint8', 'UINT8', 'uint8'),
-          ('uint16', 'UINT16', 'uint16'),
-          ('uint32', 'UINT32', 'uint32'),
-          ('uint64', 'UINT64', 'uint64'),
-          ('complex64', 'COMPLEX64', 'complex64'),
-          ('complex128', 'COMPLEX128', 'complex128')
-          # ('platform_int', 'INT', 'int_'),
-          # ('object', 'OBJECT', 'object_'),
+          # Disabling uint and complex dtypes because we do not use them
+          #  (and compiling them increases wheel size)
+          # ('uint8', 'UINT8', 'uint8'),
+          # ('uint16', 'UINT16', 'uint16'),
+          # ('uint32', 'UINT32', 'uint32'),
+          # ('uint64', 'UINT64', 'uint64'),
+          # ('complex64', 'COMPLEX64', 'complex64'),
+          # ('complex128', 'COMPLEX128', 'complex128')
 ]
 
 def get_dispatch(dtypes):

pandas/core/array_algos/take.py

@@ -284,6 +284,9 @@ def _get_take_nd_function_cached(
     if func is not None:
         return func
 
+    # We get here with string, uint, float16, and complex dtypes that could
+    #  potentially be handled in algos_take_helper.
+    #  Also a couple with (M8[ns], object) and (m8[ns], object)
     tup = (out_dtype.name, out_dtype.name)
     if ndim == 1:
         func = _take_1d_dict.get(tup, None)

pandas/core/dtypes/common.py

@@ -65,7 +65,6 @@
 _is_scipy_sparse = None
 
 ensure_float64 = algos.ensure_float64
-ensure_float32 = algos.ensure_float32
 
 
 def ensure_float(arr):
@@ -92,13 +91,10 @@ def ensure_float(arr):
     return arr
 
 
-ensure_uint64 = algos.ensure_uint64
 ensure_int64 = algos.ensure_int64
 ensure_int32 = algos.ensure_int32
 ensure_int16 = algos.ensure_int16
 ensure_int8 = algos.ensure_int8
-ensure_complex64 = algos.ensure_complex64
-ensure_complex128 = algos.ensure_complex128
 ensure_platform_int = algos.ensure_platform_int
 ensure_object = algos.ensure_object