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Posted to issues@paimon.apache.org by "thswlsqls (via GitHub)" <gi...@apache.org> on 2026/08/06 06:58:33 UTC
[PR] [avro] Fix ClassCastException when writing MULTISET with non-string element type [paimon]
thswlsqls opened a new pull request, #9066:
URL: https://github.com/apache/paimon/pull/9066
### Purpose
fix #9064
- `AvroSchemaConverter` handles `MULTISET` and `MAP` in one branch, so a non-string element gets the array-of-record encoding.
- `AvroSchemaVisitor.visit()` recognized only `MapType` in its `ARRAY` branch and cast everything else to the `final` class `ArrayType`, so any `MULTISET` with a non-string element threw `ClassCastException` on write and read, even though `validateDataFields` passed. ORC and Parquet already accept that schema.
- Reuse the converter's `extractKeyTypeToAvroMap`/`extractValueTypeToAvroMap` there, keeping schema creation and visiting on one source. The converter is untouched, so the written encoding is unchanged.
- Correct the avro `MAP`/`MULTISET` rows in `fileformat.md`: the `MAP` row says the key must be a string type, but `FormatReadWriteTest`'s `nonStrKeyMap = MAP(INT, ...)` already passes on avro.
### Tests
- Added `AvroFormatReadWriteTest#testMultisetWithNonStringElement` (round trip; throws without the fix) and `#testMultisetWithStringElement` (regression guard).
- `mvn -pl paimon-format -DfailIfNoTests=false clean install` — 531 tests passed, 0 failures. No existing test used `MULTISET`.
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Re: [PR] [avro] Fix ClassCastException when writing MULTISET with non-string element type [paimon]
Posted by "JingsongLi (via GitHub)" <gi...@apache.org>.
JingsongLi commented on PR #9066:
URL: https://github.com/apache/paimon/pull/9066#issuecomment-5205870543
+1
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Re: [PR] [avro] Fix ClassCastException when writing MULTISET with non-string element type [paimon]
Posted by "JingsongLi (via GitHub)" <gi...@apache.org>.
JingsongLi merged PR #9066:
URL: https://github.com/apache/paimon/pull/9066
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