Stephen0421 opened a new pull request, #10720:
URL: https://github.com/apache/paimon/pull/10720
### Purpose
`docs/docs/pypaimon/system-tables.md` still describes behavior that PyPaimon
no longer has.
- `with_filter` is documented as always raising `NotImplementedError`.
System-table reads already apply equality, comparison, `in`, null checks, and
string predicates (`startswith`, `endswith`, `contains`, `like`) in memory,
before projection and limit. Value comparisons on nested columns such as
`$files.write_cols` still raise `NotImplementedError`.
- `$tags.create_time` and `time_retained` are documented as always `NULL`.
They are `NULL` only when the tag was created without retention. A tag created
with `time_retained` fills `create_time` and stores the duration as Java
`Duration` text (`1d` becomes `PT24H`).
- `$manifests.min_partition_stats` and `max_partition_stats` are documented
as always `NULL`. They now use the same `{v1, v2}` text as Java (`{}` for an
unpartitioned table). The value stays `NULL` only when a partition field is
`FLOAT`, `DOUBLE`, `TIMESTAMP_LTZ`, `BINARY`, `VARBINARY`, or `BYTES`.
### Tests
Documentation only. No runtime code changes. The behavior is already covered
by `system_string_filter_test.py`, `tags_table_test.py`, and
`manifests_table_test.py`.
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