## Summary
When performing cross-database JOINs with soft-delete, the schema name
parsed from `` `schema`.`table` `` format retains database-specific
quote characters. These quoted schema names break `information_schema`
WHERE clause queries in `TableFields` lookups.
This PR strips quote characters from `usedSchema` in
`Model.TableFields()`, matching the existing unquoting pattern used for
`usedTable` via `guessPrimaryTableName`.
## Changes
- `database/gdb/gdb_model_utility.go`: Add quote-stripping for
`usedSchema` using `gstr.Trim` with database-specific quote chars from
`GetChars()`
## Test
Existing `Test_Issue2338` in MySQL
(`contrib/drivers/mysql/mysql_z_unit_issue_test.go:685`) covers this
case. The MariaDB version exists in PR #4724 branch
(`contrib/drivers/mariadb/mariadb_z_unit_issue_test.go:688`), not yet
merged. Once both PRs are merged, the MariaDB test will also validate
this fix.
closes#4725
Co-authored-by: John Guo <claymore1986@gmail.com>
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