Kefu Chai 3738fcbe05 keys: specialize fmt::formatter<partition_key> and friends ...

this is a part of a series to migrating from `operator<<(ostream&, ..)`
based formatting to fmtlib based formatting. the goal here is to enable
fmtlib to print following classes without the help of `operator<<`.

- partition_key_view
- partition_key
- partition_key::with_schema_wrapper
- key_with_schema
- clustering_key_prefix
- clustering_key_prefix::with_schema_wrapper

the corresponding `operator<<()` are dropped dropped in this change,
as all its callers are now using fmtlib for formatting now. the helper
of `print_key()` is removed, as its only caller is
`operator<<(std::ostream&, const
clustering_key_prefix::with_schema_wrapper&)`.

the reason why all these operators are replaced in one go is that
we have a template function of `key_to_str()` in `db/large_data_handler.cc`.
this template function is actually the caller of operator<< of
`partition_key::with_schema_wrapper` and
`clustering_key_prefix::with_schema_wrapper`.
so, in order to drop either of these two operator<<, we need to remove
both of them, so that we can switch over to `fmt::to_string()` in this
template function.

Refs scylladb#13245

Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>

2023-04-14 13:21:30 +08:00

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