SEZ9 commented on issue #13079:
URL: https://github.com/apache/seatunnel/issues/13079#issuecomment-6567444007

   Thanks @sharpca for opening the PR rather than just confirming the analysis.
   
   Passing `Locale.ROOT` to every `toUpperCase()` / `toLowerCase()` in the ten 
converters from the report is exactly the fix I was after, and 
`JdbcTypeConverterLocaleTest` running under `tr-TR` with lower-case `integer` / 
`int` plus upper-case `INT4` for PostgreSQL is the right shape of guard. That 
it fails against the unpatched `DB2TypeConverter` with `Unsupported type 
integer` is good evidence the test actually bites.
   
   Two small asks on the test:
   
   1. You report it as 1 test covering ten converters. Could you split it per 
converter (parameterized over the converter instances, or one method each)? If 
a regression slips into a single dialect, the failure should name that 
converter directly.
   2. Please confirm the previous default locale is captured before it is 
switched to `tr-TR` and restored even if the converter call throws. You 
describe it as restored, so this is likely already fine; a leaked `tr-TR` 
default would make unrelated tests in the same JVM fail in confusing ways.
   
   On the scan results: the six `getQuery().toLowerCase()` dialect sites, 
`CollationBasedSplitter`, and the `JdbcSourceFactory` `where_condition` check 
are the same class of bug, so bundling them with the converter fix is fine with 
me, and keeping `JdbcDialect` / `CatalogUtils` and the MySQL / OceanBase / SQL 
Server converters in their separate PRs as you describe is the right call.
   
   Once the PR workflows have run, ping me here and I'll do the full review.
   
   <!-- streview-comment:2204 -->


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