moon-fall edited a comment on issue #3909:
URL: https://github.com/apache/iceberg/issues/3909#issuecomment-1017062429
A large amount of memory is used because each datafile will read all the
data of the deletefile which seqNum is bigger than datafile in a hashSet for
filtering, But only those keys that are also in the datafile are necessary to
read , In the optimized version of my company , I use a Datafile bloom filter
to filter out unnecessary eq-deletefile keys (datafile hashset also works, but
using hashset usually consumes more memory) , if the datafile support storage
Bloom filter Such as using parquet format based on #2642 ，It's easier to read
bloom filters directly from a datafile.
maybe I can pull a request if need.
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