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- Write User Defined Functions 11576
- Overview The Rust client can register user-defined functions written in Rust: scalar functions with the vscalar feature and table functions with the vtab feature. Both operate on DuckDB's columnar data chunks, so a single call processes a b
...ia set_null ), LIST<BIGINT> , and STRUCT columns, showing how to write each vector kind. The Rust table function interface mirrors DuckDB's C API table functions as closely as possible. This feature requires features = ["vtab"] ; the vtab-arrow feature...n and the Arrow vector API shared with user-defined functions. C API — the table function interface that the Rust VTab API mirrors. Extensions — DuckDB's extension system that a loadable Rust extension plugs into. Run Queries — calling registered functi... - https://man.mtool.work/duckdb/2.0/clients/rust/functions.html
- Dutch Railway Datasets 10540
- Examples in this documentation often use datasets based on the Dutch Railway datasets . These high-quality datasets are maintained by the team behind the Rijden de Treinen (Are the trains running?) application . This page contains download
...links to our mirrors to the datasets. In 2024, we have published a blog post on the analysis of these datasets . Loading the Datasets You can l... - https://man.mtool.work/duckdb/2.0/guides/snippets/dutch_railway_datasets.html
- Profile and Monitor 7415
- Overview The Go client can observe query execution: it can retrieve per-operator profiling metrics after a query runs, and register a log storage that receives DuckDB's log messages. Both are described below. Profiling Profiling information
...ntext.Background(), `PRAGMA disable_profiling`) check(err) GetProfilingInfo() returns a duckdb.ProfilingInfo , a tree that mirrors DuckDB's query plan. Each node has a Metrics map of metric name to value and a Children slice of child nodes. Metrics are... - https://man.mtool.work/duckdb/2.0/clients/go/profiling.html
- Write User Defined Functions 7415
- 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
...ter and info objects, are valid only during callback execution and must not be retained. The Java table function interface mirrors DuckDB's C API table functions as closely as possible. Producing Rows in Chunks The example above writes every row in a si...ed function's inputs is shared with chunked results. C API — the table function interface that the Java table function API mirrors. Run Queries — calling registered functions from SQL. Configuration — the preserve_insertion_order option that parallel ta... - https://man.mtool.work/duckdb/2.0/clients/java/functions.html
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