xiangfu0 commented on PR #19035:
URL: https://github.com/apache/pinot/pull/19035#issuecomment-5230138032
**Major — `UUID_ARRAY` throws a self-contradictory error**
(`PinotResultSet.java` `getList` default, and the same in
`PinotGrpcResultSet.java` `getList`)
`ColumnDataType.UUID_ARRAY` is in `ARRAY_TYPES`, so `isArray()` returns
`true` and `getObject` dispatches it to `getList`, which has no `UUID_ARRAY`
case → `default: throw new SQLDataException("Data type is not an array:
UUID_ARRAY")`, which is factually wrong (it *is* an array). Meanwhile
`DriverUtils.isArrayDataType("UUID_ARRAY")` returns `true`, so metadata
advertises `Types.JAVA_OBJECT`/`List` while the accessor throws.
Fix: add a `case UUID_ARRAY:` (both decoders yield `String[]`, so treat like
`STRING_ARRAY`), or exclude it from `isArrayDataType` so metadata and accessor
agree. At minimum reword the default message to `"Unsupported array data type:
" + dataType`.
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