aokolnychyi opened a new pull request, #9194:
URL: https://github.com/apache/iceberg/pull/9194
This PR adds `PartitionMap`, a map that uses a pair of spec ID and partition
tuple as keys. It is similar to `PartitionSet`.
The class will simplify places like `DeleteFileIndex` that uses the
following code not related to the main logic.
```
private final Map<Integer, Types.StructType> partitionTypeById;
private final Map<Integer, ThreadLocal<StructLikeWrapper>> wrapperById;
private final Map<Pair<Integer, StructLikeWrapper>, DeleteFileGroup>
deletesByPartition;
// use HashMap with precomputed values instead of thread-safe collections
loaded on demand
// as the cache is being accessed for each data file and the lookup speed is
critical
private Map<Integer, ThreadLocal<StructLikeWrapper>> wrappers(Map<Integer,
PartitionSpec> specs) {
Map<Integer, ThreadLocal<StructLikeWrapper>> wrappers = Maps.newHashMap();
specs.forEach((specId, spec) -> wrappers.put(specId, newWrapper(specId)));
return wrappers;
}
private ThreadLocal<StructLikeWrapper> newWrapper(int specId) {
return ThreadLocal.withInitial(() ->
StructLikeWrapper.forType(partitionTypeById.get(specId)));
}
private Pair<Integer, StructLikeWrapper> partition(int specId, StructLike
struct) {
ThreadLocal<StructLikeWrapper> wrapper = wrapperById.get(specId);
return Pair.of(specId, wrapper.get().set(struct));
}
```
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