bkmgit commented on a change in pull request #11882:
URL: https://github.com/apache/arrow/pull/11882#discussion_r767635769
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File path: cpp/src/arrow/compute/kernels/codegen_internal.h
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@@ -982,6 +1021,407 @@ template <typename OutType, typename ArgType, typename
Op>
using ScalarBinaryNotNullStatefulEqualTypes =
ScalarBinaryNotNullStateful<OutType, ArgType, ArgType, Op>;
+// A kernel exec generator for ternary functions that addresses both array and
+// scalar inputs and dispatches input iteration and output writing to other
+// templates
+//
+// This template executes the operator even on the data behind null values,
+// therefore it is generally only suitable for operators that are safe to apply
+// even on the null slot values.
+//
+// The "Op" functor should have the form
+//
+// struct Op {
+// template <typename OutValue, typename Arg0Value, typename Arg1Value,
typename
+// Arg2Value> static OutValue Call(KernelContext* ctx, Arg0Value arg0,
Arg1Value arg1,
+// Arg2Value arg2, Status *st) {
Review comment:
Reformatted.
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