laserninja opened a new issue, #18119:
URL: https://github.com/apache/iceberg/issues/18119
### Apache Iceberg version
main (development), commit `c4784768b`
### Query engine
Other: Java API
### Please describe the bug
A schema with a double default expressed as JSON `1` fails to parse, while
the equivalent `1.0` succeeds.
```java
SchemaParser.fromJson("{\"type\":\"struct\",\"schema-id\":0,\"fields\":["
+ "{\"id\":1,\"name\":\"score\",\"required\":false,"
+ "\"type\":\"double\",\"initial-default\":1}]}");
```
Actual: `IllegalArgumentException: Cannot parse default as a double value:
1`.
Expected: a double default of `1.0`. Appendix D specifies a JSON number for
float/double values, and `1` is a valid numeric representation.
`SingleValueParser` requires Jackson's `isFloatingPointNumber()` for
float/double, excluding integral numeric nodes. JSON producers may emit these
values without a decimal point.
Proposed fix: accept numeric nodes for float/double while retaining
rejection of strings and booleans. Cover both types and initial/write defaults
through the schema parser.
### Willingness to contribute
- [x] I can contribute a fix for this bug independently
This report and its reproduction were prepared with AI assistance and
verified locally.
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