felipecrv commented on code in PR #41373:
URL: https://github.com/apache/arrow/pull/41373#discussion_r1588599102


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cpp/src/arrow/compute/kernels/vector_selection_take_internal.cc:
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@@ -884,13 +756,11 @@ void 
PopulateTakeKernels(std::vector<SelectionKernelData>* out) {
   auto take_indices = match::Integer();
 
   *out = {
-      {InputType(match::Primitive()), take_indices, PrimitiveTakeExec},
+      {InputType(match::Primitive()), take_indices, FixedWidthTakeExec},
       {InputType(match::BinaryLike()), take_indices, VarBinaryTakeExec},
       {InputType(match::LargeBinaryLike()), take_indices, 
LargeVarBinaryTakeExec},
-      {InputType(Type::FIXED_SIZE_BINARY), take_indices, FSBTakeExec},
+      {InputType(match::FixedSizeBinaryLike()), take_indices, 
FixedWidthTakeExec},
       {InputType(null()), take_indices, NullTakeExec},
-      {InputType(Type::DECIMAL128), take_indices, PrimitiveTakeExec},
-      {InputType(Type::DECIMAL256), take_indices, PrimitiveTakeExec},

Review Comment:
   "FixedSizeBinaryLike" includes FSB and the Decimal types. Not to be confused 
with "fixed-WIDTH like" which includes special fixed-size lists (see 
`util/fixed_width_internal.h`). I wanted to name the latter "fixed-width modulo 
nesting" to be more upfront about the nesting aspect, but that turned out too 
obtuse and verbose.



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