fix: serialize unbounded varchar as string - #730
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JingsongLi merged 3 commits intoAug 19, 2026
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Verified that unbounded VarChar serialization now matches Java Paimon's canonical STRING / STRING NOT NULL forms while bounded VARCHAR(n) remains unchanged. The parser already accepts both aliases, and the regression coverage covers nullable, non-null, and bounded cases. LGTM.
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* main: perf: vectorize raw vector search (apache#734) feat(file_index): add predicate evaluation foundation (apache#721) feat(go): add postpone fixed-bucket write bindings (apache#722) perf(vindex): split build timing logs by phase (apache#723) fix(avro): read TIME, BLOB, MULTISET and non-string-key map columns (apache#724) fix(datafusion): surface tag create-time and retention in $tags (apache#728) [core] Support multivalue global index (apache#731) feat: add Java-compatible array predicate pushdown (apache#732) fix: serialize unbounded varchar as string (apache#730) perf(vindex): decouple vector read threads and remove chunk barrier (apache#720) feat(vindex): add DiskANN and IVF-SQ/RQ support (apache#726) # Conflicts: # crates/paimon/src/table/data_file_reader.rs # crates/paimon/src/table/vindex_index_build_builder.rs
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Summary
VarCharTypewith Java'sSTRINGaliasSTRING NOT NULLand boundedVARCHAR(n)behaviorRoot cause
VarCharTypeuses display-based Serde serialization, but itsDisplayimplementation always emittedVARCHAR(length). As a result, the maximum length used to representSTRINGwas persisted asVARCHAR(2147483647)instead of Java's canonicalSTRINGform.Validation
cargo fmt --all -- --checkcargo test -p paimon --lib(2317 passed,2 ignored)