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GH-51471: [C++] Disable simdjson threading in chunker #51473

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Merged
pitrou merged 2 commits into from
Sep 29, 2026
Merged

GH-51471: [C++] Disable simdjson threading in chunker #51473

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[C++] Disable simdjson threading in chunker
taepper Sep 23, 2026
fb56ccb
Merge remote-tracking branch 'origin/main' into GH-51471
taepper Sep 28, 2026
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7 changes: 6 additions & 1 deletion cpp/src/arrow/json/chunker.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -46,7 +46,12 @@ int64_t ConsumeWhitespace(std::string_view view) {
// and uses the structural indexes computed by simdjson to delimit them.
class ParsingBoundaryFinder : public BoundaryFinder {
public:
explicit ParsingBoundaryFinder(MemoryPool* pool) : pool_(pool) {}
explicit ParsingBoundaryFinder(MemoryPool* pool) : pool_(pool) {
// A simdjson document stream may start a thread to index the next batch in the
// background. We do not want to do this eagerly as we might not need to parse
// the next block
parser_.threaded = false;
}

Status FindFirst(std::string_view partial, std::string_view block,
int64_t* out_pos) override {
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