bryanck commented on issue #480: Don't group files with different partition specs in BaseRewriteManifests URL: https://github.com/apache/incubator-iceberg/issues/480#issuecomment-532221369 The downside is that this could potentially result in many small manifests. For example, we have a bucketed table with 10k buckets, which is additionally partitioned by date and hour. So for a week of data we'd have 10k * 24 * 7 = 1.68 million manifests. What we do with RewriteManifests today is combine files into groups of four buckets and ignore date and hour, which results in 10k/4 = 2.5k manifests for a week of data. Performance with file pruning is good even though the manifests have multiple partition specs.
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