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- Functions 11839
- Function Syntax Function Chaining via the Dot Operator DuckDB supports the dot syntax for function chaining. This allows the function call fn(arg1, arg2, arg3, ...) to be rewritten as arg1.fn(arg2, arg3, ...) . For example, take the followi
...name FROM unnest(['African goose', 'Faroese goose', 'Hungarian goose', 'Pomeranian goose']) breed(goose_name); This can be rewritten as follows: SELECT goose_name.replace('goose', 'duck') AS duck_name FROM unnest(['African goose', 'Faroese goose', 'Hungar... - https://man.mtool.work/duckdb/2.0/sql/functions/overview.html
- Indexes 10277
- Index Types DuckDB has two built-in index types. Indexes can also be defined via extensions . Min-Max Index (Zonemap) A min-max index (also known as zonemap or block range index) is automatically created for columns of all general-purpose d
...an INSERT of the updated row. This rewrite has performance implications, particularly for wide tables, as entire rows are rewritten instead of only the affected columns. Additionally, it causes the following constraint-checking limitation of UPDATE state...elow, note how the number of rows exceeds DuckDB's standard vector size, which is 2048 by default. The UPDATE statement is rewritten into a DELETE , followed by an INSERT . This rewrite happens per chunk of data (2048 rows) moving through DuckDB's process... - https://man.mtool.work/duckdb/2.0/sql/indexes.html
- Iceberg Functions 9486
- The iceberg extension provides the following functions: Function Description iceberg_scan(source) Reads an Iceberg table from a path. iceberg_metadata(source) Returns the manifest entries of an Iceberg table. iceberg_snapshots(source) Retur
...ve schema properties CALL remove_iceberg_schema_properties( iceberg_catalog.default, ['description'] ); Schema properties are written through the Iceberg REST Catalog, so any other Iceberg-aware engine attached to the same catalog will see the updates imm...files into files close to the target file size, applying any pending position and equality deletes. It returns the columns rewritten_data_files_count , added_data_files_count , rewritten_bytes_count , failed_data_files_count and removed_delete_files_count...et_file_size_bytes VARCHAR or integer The table's write.target-file-size-bytes property, or 512 MiB The target size of the rewritten files. min_file_size_bytes VARCHAR or integer 75% of the target file size Files smaller than this are candidates for rewri... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/iceberg_functions.html
- Troubleshoot 7537
- Overview This page collects common issues encountered when using DuckDB-Wasm, together with their workarounds. If you run into a problem that is not covered here, search the duckdb-wasm issue tracker on GitHub. Network Error When Querying R
...eading remote files has several other known limitations: Because every request is upgraded to HTTPS, an http:// URL can be rewritten incorrectly (for example to https://http//… ), which breaks reads against local or non-TLS endpoints (see duckdb-wasm issu... - https://man.mtool.work/duckdb/2.0/clients/wasm/troubleshoot.html
- Writing to Iceberg 6765
- The DuckDB iceberg extension supports writing to Iceberg tables when an Iceberg catalog is attached. Writing to a table read directly from storage with iceberg_scan is not supported: the catalog is required to commit the new table metadata.
...he next time they query the LoadTableInformation endpoint. Iceberg schema evolution is metadata-only, so no data files are rewritten. Partitioning Tables can be partitioned with the PARTITIONED BY clause using the Iceberg partition transforms : Transform... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/writing_to_iceberg.htm...
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