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- Write User Defined Functions 9414
- Overview The JDBC driver can register user-defined functions (UDFs) written in Java, including scalar functions and table functions. This page covers building and registering both, from the simple functional-interface overloads to the vecto
...rized interface, along with type mapping and the function registry. Scalar Functions Build a scalar function with the DuckDBFunctions.scalarFunction() builder — which returns an org.duckdb.DuckDBScalarFunc...; import org.duckdb.DuckDBFunctions; try (Connection conn = DriverManager.getConnection("jdbc:duckdb:")) { DuckDBFunctions.scalarFunction() .withName("java_add_one") .withParameter(int.class) .withReturnType(int.class) .withIntFunction(x -> x + 1) .register(co...va_add_one(41); The binary overloads take two arguments of the same type, declared with withParameters() : DuckDBFunctions.scalarFunction() .withName("java_weighted_sum") .withParameters(double.class, double.class) .withReturnType(double.class) .withDoubleFunc... - https://man.mtool.work/duckdb/2.0/clients/java/functions.html
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