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- Vector Similarity Search Extension 12959
- The vss extension is an experimental extension for DuckDB that adds indexing support to accelerate vector similarity search queries using DuckDB's new fixed-size ARRAY type. See the announcement blog post and the “What's New in the Vector S
...28 The number of candidate vertices to consider during the construction of the index. A higher value will result in a more accurate index, but will also increase the time it takes to build the index. ef_search 64 The number of candidate vertices to consi...der during the search phase of the index. A higher value will result in a more accurate index, but will also increase the time it takes to perform a search. M 16 The maximum number of neighbors to keep for each...vertex in the graph. A higher value will result in a more accurate index, but will also increase the time it takes to build the index. M0 2 * M The base connectivity, or the number of neigh... - https://man.mtool.work/duckdb/2.0/core_extensions/vss.html
- Aggregate Functions 10103
- Examples Produce a single row containing the sum of the amount column: SELECT sum(amount) FROM sales; Produce one row per unique region, containing the sum of amount for each group: SELECT region, sum(amount) FROM sales GROUP BY region; Ret
...'s rounding, returning a DECIMAL with the same width and scale as the input. favg(arg) Calculates the average using a more accurate floating point summation (Kahan Sum). This function is affected by ordering . first(arg) Returns the first value (null or...non-null) from arg . This function is affected by ordering . fsum(arg) Calculates the sum using a more accurate floating point summation (Kahan Sum). This function is affected by ordering . geometric_mean(arg) Calculates the geometric...| New The decimal_average function was added in DuckDB 2.0. favg(arg) | Description | Calculates the average using a more accurate floating point summation (Kahan Sum). This function is affected by ordering . | | Example | favg(A) | first(arg) | Descrip... - https://man.mtool.work/duckdb/2.0/sql/functions/aggregates.html
- Spatial Functions 9742
- Function Index Scalar Functions Function Summary DuckDB_PROJ_Compiled_Version Returns a text description of the PROJ library version that this instance of DuckDB was compiled against. DuckDB_Proj_Version Returns a text description of the PR
...is function uses the GeographicLib library, calculating the area using an ellipsoidal model of the earth. This is a highly accurate method for calculating the area of a polygon taking the curvature of the earth into account, but is also the slowest. Retu...e geodesic problem , calculating the distance between two points using an ellipsoidal model of the earth. This is a highly accurate method for calculating the distance between two arbitrary points taking the curvature of the earths surface into account,...e geodesic problem , calculating the distance between two points using an ellipsoidal model of the earth. This is a highly accurate method for calculating the distance between two arbitrary points taking the curvature of the earths surface into account,... - https://man.mtool.work/duckdb/2.0/core_extensions/spatial/functions.html
- Parquet Tips 9037
- Below is a collection of tips to help when dealing with Parquet files. Tips for Reading Parquet Files Use union_by_name When Loading Files with Different Schemas The union_by_name option can be used to unify the schema of files that have di
...he behavior of FILE_SIZE_BYTES . However, if PER_THREAD_OUTPUT is set, only one thread writes to each file, and it becomes accurate again. Sorting Rows to Improve Row Group Pruning DuckDB writes per-column statistics, including min/max values, for every... - https://man.mtool.work/duckdb/2.0/data/parquet/tips.html
- Relational API 8314
- The Relational API builds a query one step at a time from Python. A relation, a DuckDBPyRelation , is a piece of SQL text: the methods of the Transformation and Functions sections return a new relation whose text extends the one they were c
...es the dense rank within the partition. favg Computes the average of all values present in a given expression using a more accurate floating point summation (Kahan Sum). first Returns the first value of a given expression. first_value Computes the first...value within the group or partition. fsum Computes the sum of all values present in a given expression using a more accurate floating point summation (Kahan Sum). geomean Computes the geometric mean over all values present in a given expression. h...ected_columns: str = '') -> DuckDBPyRelation Computes the average of all values present in a given expression using a more accurate floating point summation (Kahan Sum). Parameters expression : str The column or expression to calculate the average of. *... - https://man.mtool.work/duckdb/2.0/clients/python/relational_api.html
- Command Line Client 7591
- Installation To use the DuckDB CLI client, visit the CLI installation page . The latest stable version of the DuckDB command line client is 2.0.0. Installation The DuckDB CLI (Command Line Interface) is a single, dependency-free executable.
...d time remaining until completion. This feature employs advanced statistical modeling ( Kalman filtering ) to deliver more accurate predictions than simple linear extrapolation. How It Works DuckDB calculates the estimated time to completion through the... - https://man.mtool.work/duckdb/2.0/clients/cli/overview.html
- Python Client API 7229
- Connection class duckdb. Appender Bases: object append_row ( self , * args ) → None Buffer one row, one value per column, each converted as an executemany parameter would be append_rows ( self , rows : object ) → None Buffer each row of an
...cted_columns : str = '' ) → DuckDBPyRelation Computes the average of all values present in a given expression using a more accurate floating point summation (Kahan Sum). Detailed examples can be found at Relational API page . fetch_arrow_reader ( batch_s...rojected_columns : str = '' ) → DuckDBPyRelation Computes the sum of all values present in a given expression using a more accurate floating point summation (Kahan Sum). Detailed examples can be found at Relational API page . geomean ( expression : str ,... - https://man.mtool.work/duckdb/2.0/clients/python/reference/
- COPY Statement 7229
- Examples Read a CSV file into the lineitem table, using auto-detected CSV options: COPY lineitem FROM 'lineitem.csv'; Read a CSV file into the lineitem table, using manually specified CSV options: COPY lineitem FROM 'lineitem.csv' (DELIMITE
...he behavior of FILE_SIZE_BYTES . However, if per_thread_output is set, only one thread writes to each file, and it becomes accurate again. BIGINT (empty) PARQUET_VERSION The Parquet version to use ( V1 , V2 ). VARCHAR V1 CHUNK_SIZE Alias for ROW_GROUP_SI... - https://man.mtool.work/duckdb/2.0/sql/statements/copy.html
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