pitrou commented on code in PR #51038:
URL: https://github.com/apache/arrow/pull/51038#discussion_r4081087789


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cpp/src/arrow/util/simdjson_internal.cc:
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@@ -581,4 +581,18 @@ Status ValidateJsonDocument(simdjson::ondemand::parser& 
parser,
   return ConsumeJsonValue(value);
 }
 
+/// Returns the number of leading whitespace characters when trailing is false,
+/// or the number of trailing whitespace characters when trailing is true.
+// XXX We could try to SIMD-accelerate this routine.

Review Comment:
   > I removed that part because the helper is now also used by the parser, 
where it may examine more bytes than the original chunker-only use case. If 
that assumption is still valid, I can restore the comment.
   
   Well, can you investigate to find out whether it still applies?



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