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- CREATE INDEX Statement 12777
- CREATE INDEX The CREATE INDEX statement constructs an index on the specified column(s) of the specified table. Examples Create a unique index films_id_idx on the column id of table films : CREATE UNIQUE INDEX films_id_idx ON films (id); Cre
...yet exist: CREATE INDEX IF NOT EXISTS s_idx ON films (revenue); The CREATE INDEX IF NOT EXISTS statement does not have an “early exit” at the moment, instead, it will attempt to create the index and only check its existence before committing it to sto...rage. Therefore, it may run for a longer time compared to other IF NOT EXISTS statements, which terminate early. Create compound index gy_idx on genre and year columns: CREATE INDEX gy_idx ON films (genre, year); Create index i_index... - https://man.mtool.work/duckdb/2.0/sql/statements/create_index.html
- Avro Extension 8824
- The avro extension enables DuckDB to read Apache Avro files. The avro extension was released as a community extension in late 2024 and became a core extension in early 2025. The read_avro Function The extension adds a single DuckDB function
... - https://man.mtool.work/duckdb/2.0/core_extensions/avro.html
- Execution Format 8512
- Vector is the container format used to store in-memory data during execution. DataChunk is a collection of Vectors, used for instance to represent a column list in a PhysicalProjection operator. Data Flow DuckDB uses a vectorized query exec
...o avoid having to call strlen and having to continuously check for null-pointers. The prefix is used for comparisons as an early out (when the prefix does not match, we know the strings are not equal and don't need to chase any pointers). List Vectors... - https://man.mtool.work/duckdb/2.0/internals/vector.html
- Create Synthetic Data 8218
- DuckDB lets you quickly generate synthetic datasets by combining a few building blocks: functions and clauses that generate rows , functions that generate values to fill those rows, and extensions that generate whole benchmark datasets. Thi
...age. │ Stay different gun according make large read… │ true │ │ 16510940941872865459 │ 2006-07-30 │ Ten quickly expect. │ Early race claim. Middle economy box nor. An… │ true │ │ 13285076694688170502 │ 2018-02-19 │ Spring writer onto. │ Lose painting... - https://man.mtool.work/duckdb/2.0/guides/snippets/create_synthetic_data.html
- Write User Defined Functions 7592
- 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
...source.close(); } } DuckDB calls close() after the function is exhausted, after a LIMIT , or on an error, cancellation, or early JDBC close. Cleanup may run on native worker threads with no ordering guarantees, so close() should be fast, idempotent, a... - https://man.mtool.work/duckdb/2.0/clients/java/functions.html
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