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- Parquet Import 11924
- To read data from a Parquet file, use the read_parquet function in the FROM clause of a query: SELECT * FROM read_parquet('input.parquet'); Alternatively, you can omit the read_parquet function and let DuckDB infer it from the extension: SE
...he Schema on the Fly You can load a Parquet file into a slightly different schema (e.g., different number of columns, more relaxed types) using the following trick. Suppose you have a Parquet file with two columns, c1 and c2 : COPY (FROM (VALUES (42, 43... - https://man.mtool.work/duckdb/2.0/guides/file_formats/parquet_import.html
- Write User Defined Functions 7980
- 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
...vector's worth of rows. let capacity = output.flat_vector(0).capacity(); let start = cursor.fetch_add(capacity, Ordering::Relaxed); if start >= count { output.set_len(0); // no more rows: end the scan return Ok(()); } let rows = capacity.min(count - st... - https://man.mtool.work/duckdb/2.0/clients/rust/functions.html
- Load Extensions 7980
- Overview DuckDB-Wasm's (dynamic) extension loading is modeled after regular DuckDB's extension loading, with a few relevant differences due to the difference in platform. A growing subset of core, community, and external extensions is suppo
...mains a valid WebAssembly file. Currently, this custom section is required to be the last one, but this requirement may be relaxed in the future. INSTALL and LOAD The INSTALL semantic in native embeddings of DuckDB is to fetch, decompress from gzip and... - https://man.mtool.work/duckdb/2.0/clients/wasm/extensions.html
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