rshdhere opened a new issue, #18475:
URL: https://github.com/apache/iceberg/issues/18475
### Apache Iceberg version
main (development)
### Query engine
None
### Please describe the bug 🐞
**Problem**
`NessieIcebergClient.listNamespaces` builds a CEL filter for child
namespaces by putting the parent's name inside a single-quoted string literal,
without escaping it:
```java
"size(entry.keyElements) == %d && entry.encodedKey.startsWith('%s.')"
```
So listing the children of a namespace whose name contains `'` or `\`
breaks, with both Nessie API v1 and v2:
- `catalog.listNamespaces(Namespace.of("o'brien"))` fails with
`NessieBadRequestException: Bad Request (HTTP/400): ... ScriptCreateException:
parse failed: ... Syntax error: mismatched input 'brien'`, because the quote
ends the literal early.
- `catalog.listNamespaces(Namespace.of("a\\b"))` returns an empty list
instead of `a\b.c`, because CEL reads `\b` as an escape sequence.
Creating, loading and dropping these namespaces works; only listing their
children is affected.
**Proposal**
Escape `\` and `'` in the name before formatting it into the filter, so it
stays a single CEL string literal. This is the only place in the repo that
builds a CEL filter.
**Related**
#18034 / #18035 touch the existence check earlier in the same method. This
fix is independent of that change.
I'll open a PR for this.
### Willingness to contribute
- [X] I can contribute a fix for this bug independently
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