jmalkin commented on code in PR #69:
URL:
https://github.com/apache/datasketches-bigquery/pull/69#discussion_r1797479544
##########
theta/sqlx/theta_sketch_agg_int64_lgk_seed_p.sqlx:
##########
@@ -89,18 +81,19 @@ export function serialize(state) {
}
} else if (state.sketch != null) {
state.serialized = state.sketch.serializeAsUint8ArrayCompressed();
+ state.sketch.delete();
+ delete state.sketch;
} else if (state.union != null) {
state.serialized = state.union.getResultAsUint8ArrayCompressed();
+ state.union.delete();
+ delete state.union;
}
- return {
- lg_k: state.lg_k,
- seed: state.seed,
- serialized: state.serialized
- };
+ return state;
} catch (e) {
throw new Error(Module.getExceptionMessage(e));
} finally {
- destroyState(state);
+ if (state.sketch != null) state.sketch.delete();
Review Comment:
I think here (and the next line) we need to explicitly delete `state.sketch`
and `state.union` from the struct. Otherwise multiple deserialize->aggregate
transitions might risk use-after-free errors. Not 100% sure, but I'd certainly
feel better ensuring it can't happen.
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