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Java Scalar and Table Functions (UDF)

The JDBC driver can register user-defined functions (UDFs) written in Java. This feature is documented in full on the DuckDB website:

That page covers building and registering scalar functions (the functional-interface overloads, variadic arguments, NULL handling, volatile functions, error handling, and the vectorized DuckDBScalarFunction interface), table functions (DuckDBTableFunction, resource cleanup via DuckDBTableFunctionState, parallel execution, and projection pushdown), inspecting the Java-side function registry, and type mapping.

Repo-specific reference

The exercised examples live in the driver's own test suite:

  • src/test/java/org/duckdb/TestScalarFunctions.java
  • src/test/java/org/duckdb/TestTableFunctions.java