pitrou commented on issue #47112:
URL: https://github.com/apache/arrow/issues/47112#issuecomment-3201273738
(sorry for the delay, I was on vacation!)
> With an event driven API, callers would pull either type of run, but would
need some bookkeeping to manage cases where the `n_values` they are asked to
pull will fall in the middle of a run. This logic need to be repeated for each
caller.
That, or the event driven API itself has a top-level Parse method that takes
a `n_values`, such that the parser does the bookkeeping by itself.
Something like:
```c++
struct RepeatedRun {
uint32_t value;
int32_t num_values;
};
struct LiteralRun {
const uint8_t* data;
int32_t num_values;
};
class RleBitPackedParser {
public:
// Snip constructor, etc.
template <typename Handler>
void ParseValues(int n_values, Handler&& handler);
};
// API expected of a handler
struct Handler {
void OnRepeatedRun(RepeatedRun run);
void OnLiteralRun(LiteralRun run);
void OnEnd();
};
```
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