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- Vectors – DuckDB 16246
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...a value is NULL , the values contained within the primary array at that index is undefined (and can be uninitialized). The validity mask is a bitmask consisting of uint64_t elements. For every 64 values in the vector, one uint64_t element exists (roun...ded up). The validity mask has its bit set to 1 if the value is valid, or set to 0 if the value is invalid (i.e . NULL ). The bits of the bit...mask can be read directly, or the slower helper method duckdb_validity_row_is_valid can be used to check whether or not a value is NULL . The duckdb_vector_get_validity returns a pointer to... - https://man.mtool.work/duckdb/1.3/clients/c/vector.html
- Complete API – DuckDB 10429
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...column_type ( duckdb_vector vector ); void * duckdb_vector_get_data ( duckdb_vector vector ); uint64_t * duckdb_vector_get_validity ( duckdb_vector vector ); void duckdb_vector_ensure_validity_writable ( duckdb_vector vector ); void duckdb_vector_assi...ector , duckdb_value value ); void duckdb_vector_reference_vector ( duckdb_vector to_vector , duckdb_vector from_vector ); Validity Mask Functions bool duckdb_validity_row_is_valid ( uint64_t * validity , idx_t row ); void duckdb_validity_set_row_vali...dity ( uint64_t * validity , idx_t row , bool valid ); void duckdb_validity_set_row_invalid ( uint64_t * validity , idx_t row ); void duckdb_valid... - https://man.mtool.work/duckdb/1.3/clients/c/api.html
- JSON Processing Functions – DuckDB 9081
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...e following scalar JSON functions can be used to gain information about the stored JSON values. With the exception of json_valid(json) , all JSON functions produce an error when invalid JSON is supplied. We support two kinds of notations to describe l...s specified, return the type of the element at the given path . If path is a LIST , the result will be LIST of types. json_valid(json) Return whether json is valid JSON. json(json) Parse and minify json . The JSONPointer syntax separates each field wi...","goose","swan",null]} SELECT j.family FROM example ; "anatidae" SELECT j.species [ 0 ] FROM example ; "duck" SELECT json_valid ( j ) FROM example ; true SELECT json_valid ( '{' ); false SELECT json_array_length ( '["duck", "goose", "swan", null]' );... - https://man.mtool.work/duckdb/1.3/data/json/json_functions.html
- Directly Reading Files – DuckDB 8691
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...e_function, files, three.txt] 42 10 [test, sql, table_function, files, two.txt] Foo Bar\nFöö Bär The file content is first validated to be valid UTF-8. If read_text attempts to read a file with invalid UTF-8, an error is thrown suggesting to use read_...ses where the underlying filesystem is unable to provide some of this data due (e.g., because HTTPFS can't always return a valid timestamp), the cell is set to NULL instead. Support for Projection Pushdown The table functions also utilize projection p...table files content size text blob filename column functions DuckDB glob last reads selected parse path Hello World three valid instead Documentation Guides Formats 関連するページ Caveats Reading and Writing Parquet Files Reading Multiple Files Full... - https://man.mtool.work/duckdb/1.3/guides/file_formats/read_file.html
- Extensions – DuckDB 8041
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...ure is appended to the Wasm file as a WebAssembly custom section called duckdb_signature . This ensures the file remains a valid WebAssembly file. Currently, we require this custom section to be the last one, but this can be potentially relaxed in the...property of the binary itself, so copying a DuckDB extension (say to serve it from a different location) will still keep a valid signature (e.g., for local development). Fetching DuckDB-Wasm Extensions Official DuckDB extensions are served at extensio... - https://man.mtool.work/duckdb/1.3/clients/wasm/extensions.html
- Blob Functions – DuckDB 8041
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...ts, or blobs. NULL inputs are skipped. See also operator || . decode(blob) Converts blob to VARCHAR . Fails if blob is not valid UTF-8. encode(string) Converts the string to BLOB . Converts UTF-8 characters into literal encoding. from_base64(string) C...concat('Hello', ' ', 'World') Result Hello World decode(blob) Description Converts blob to VARCHAR . Fails if blob is not valid UTF-8. Example decode('\xC3\xBC'::BLOB) Result ü encode(string) Description Converts the string to BLOB . Converts UTF-8 c... - https://man.mtool.work/duckdb/1.3/sql/functions/blob.html
- Spatial Functions – DuckDB 7976
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...geometry "properly" contains the second geometry ST_ConvexHull Returns the convex hull enclosing the geometry ST_CoverageInvalidEdges Returns the invalid edges in a polygonal coverage, which are edges that are not shared by two polygons. ST_CoverageSi...true if the geometry is a ring (both ST_IsClosed and ST_IsSimple). ST_IsSimple Returns true if the geometry is simple ST_IsValid Returns true if the geometry is valid ST_Length Returns the length of the input line geometry ST_Length_Spheroid Returns t...akeLine Create a LINESTRING from a list of POINT geometries ST_MakePolygon Create a POLYGON from a LINESTRING shell ST_MakeValid Returns a valid representation of the geometry ST_MaximumInscribedCircle Returns the maximum inscribed circle of the input... - https://man.mtool.work/duckdb/1.3/core_extensions/spatial/functions.html
- SQL to/from JSON – DuckDB 7976
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..."tbl1"},"aggregate_handling":"STANDARD_HANDLING"}}]} Example with a syntax error: SELECT json_serialize_sql ( 'TOTALLY NOT VALID SQL' ); {"error":true,"error_type":"parser","error_message":"syntax error at or near \"TOTALLY\"","error_subtype":"SYNTAX_...l ( 'SELECT 1 + 2' )); 3 Example with error: SELECT * FROM json_execute_serialized_sql ( json_serialize_sql ( 'TOTALLY NOT VALID SQL' )); Parser Error: Error parsing json: parser: syntax error at or near "TOTALLY" 関連キーワード type json query locati... - https://man.mtool.work/duckdb/1.3/data/json/sql_to_and_from_json.html
- CSV Auto Detection – DuckDB 7895
- This page is for DuckDB 1.3, which is outdated. Switch to the current version . Search Shortcut cmd + k | ctrl + k Installation Documentation Getting Started Connect Overview Concurrency Data Import Overview Data Sources CSV Files Overview
...may be specified using the types option is not as limited as the types available for the auto_type_candidates option: any valid type definition is acceptable to the types -option. (To get a valid type definition, use the typeof() function, or use the... - https://man.mtool.work/duckdb/1.3/data/csv/auto_detection.html
- Query – DuckDB 7814
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...data_chunk_get_vector ( result , 0 ); int32_t * col1_data = ( int32_t * ) duckdb_vector_get_data ( col1 ); uint64_t * col1_validity = duckdb_vector_get_validity ( col1 ); // get the second column duckdb_vector col2 = duckdb_data_chunk_get_vector ( res...ult , 1 ); int32_t * col2_data = ( int32_t * ) duckdb_vector_get_data ( col2 ); uint64_t * col2_validity = duckdb_vector_get_validity ( col2 ); // iterate over the rows for ( idx_t row = 0 ; row < row_count ; row ++ ) { if (...duckdb_validity_row_is_valid ( col1_validity , row )) { printf ( "%d" , col1_data [ row ]); } else { printf ( "NULL" ); } printf ( ","... - https://man.mtool.work/duckdb/1.3/clients/c/query.html
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