R: Fix protection errors for relational API #6469
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krlmlr
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hannes
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Feb 27, 2023
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| [[cpp11::register]] SEXP rapi_rel_set_diff(duckdb::rel_extptr_t rel_a, duckdb::rel_extptr_t rel_b) { | ||
| auto res = std::make_shared<SetOpRelation>(rel_a->rel, rel_b->rel, SetOperationType::EXCEPT); | ||
| return make_external<RelationWrapper>("duckdb_relation", res); | ||
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| cpp11::writable::list prot = {rel_a, rel_b}; |
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Looks good, but can't we do the list wrapping in make_external_prot, too?
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Does this mean passing two arguments to make_external_prot(), or just inlining the prot variable?
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I was thinking of the latter but not sure if it still shows the desired behaviour
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I suspect it would, the temporary list won't be destroyed for the duration of the make_external()call, and hece will remain protected. We can try in a second iteration.
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Closes #6465.
This adds a tiny change to the vendored cpp11 code, we should eventually upstream it to take advantage of future updates.