wangyusheng1985 opened a new pull request, #9849:
URL: https://github.com/apache/paimon/pull/9849
### Purpose
String-to-MAP casting split entries first and then used a regex to separate
key from value, so quote state for the individual key or value was gone by the
time `parseValue` ran. `{"" -> a}` lost the empty key and `{k -> "null"}`
became a SQL NULL value.
This change splits entries and then key/value with `TokenSplitter.splitRaw`
so quotes survive, then parses each side through `TokenSplitter.split` the same
way ARRAY and ROW already do.
Fixes #9782
### Tests
`mvn -pl paimon-common -DwildcardSuites=none -Dtest=CastExecutorTest
spotless:check test` passed (46 tests). Coverage includes quoted empty
keys/values, quoted vs unquoted null, escaped null, quotes around `->` and `,`,
and the `MAP()` function form.
Validation observed for this change:
- `mvn -pl paimon-common -DwildcardSuites=none -Dtest=CastExecutorTest
spotless:check test`
Fixes #9782
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