yihua opened a new pull request, #709:
URL: https://github.com/apache/hudi-rs/pull/709
## Description
Two statements in `README.md` and `docs/reader-spec.md` no longer match the
code. Both say every `hoodie.read.*` config is dropped at table construction,
which stopped being true when read configs gained a scope in #660: only the
`ReadOnly` ones (query type, as-of/start/end timestamps) are dropped, while
`TableOrRead` ones survive on the table and are overridden per read. Both also
say a MOR slice with log files streams as a single merged batch, which now
describes file group reader version 1 only; version 2 has been the default
since #677 and streams a bounded merged chunk at a time.
The rest of the diff fills gaps those commits opened: a read config table in
the README (including `hoodie.read.file.group.reader.version` and the escape
hatch its CUSTOM merge mode error points at), the `spill-rocksdb` default
feature and what dropping it costs, Lance base files, and row-group pruning in
the spec's filter section.
## How are the changes test-covered
- [x] N/A
- [ ] Automated tests (unit and/or integration tests)
- [ ] Manual tests
- [ ] Details are described below
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