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- Building Configuration 11730
- Build Types DuckDB can be built in many different settings, most of these correspond directly to CMake but not all of them. release This build has been stripped of all the assertions and debug symbols and code, optimized for performance. de
...and then runs Clang-Tidy to check for issues or style violations through static analysis. The CI will also run this check, causing it to fail if this check fails. format-fix | format-changes | format-main This doesn't actually create a build, but uses t...format issues in the code. cmake-format to fix format issues in the CMakeLists.txt files. The CI will also run this check, causing it to fail if this check fails. Extension Selection Core DuckDB extensions are the ones maintained by the DuckDB team. The... - https://man.mtool.work/duckdb/2.0/dev/building/build_configuration.html
- Crashes 11314
- DuckDB is thoroughly tested via an extensive test suite. However, bugs can still occur and these can sometimes lead to crashes. This page contains practical information on how to troubleshoot DuckDB crashes. Types of Crashes There are a few
...ng the Query Optimizer Some crashes are caused by DuckDB's query optimizer component. To identify whether the optimizer is causing the crash, try to turn it off and re-run the query: PRAGMA disable_optimizer; If the query finishes successfully, then the...iginal query and observe which step reintroduces the error. In both cases, you will have a better understanding of what is causing the issue and potentially also a workaround that you can use right away. In any case, please consider submitting an issue... - https://man.mtool.work/duckdb/2.0/guides/troubleshooting/crashes.html
- TRY Expression 10501
- The TRY expression ensures that errors caused by the input rows in the child (scalar) expression result in NULL for those rows, instead of causing the query to throw an error. The TRY expression was inspired by the TRY_CAST expression . Exa
... - https://man.mtool.work/duckdb/2.0/sql/expressions/try.html
- Non-Deterministic Behavior 9290
- Several operators in DuckDB exhibit non-deterministic behavior. Most notably, SQL uses set semantics, which allows results to be returned in a different order. DuckDB exploits this to improve performance, particularly when performing multi-
...) due to floating-point inaccuracies. Working Around Non-Determinism For the majority of use cases, non-determinism is not causing any issues. However, there are some cases where deterministic results are desirable. In these cases, try the following wor... - https://man.mtool.work/duckdb/2.0/operations_manual/non-deterministic_behavior.h...
- R-Tree Indexes 7663
- The spatial extension provides support for spatial indexing through the R-tree extension index type. Why Should I Use an R-Tree Index? When working with geospatial datasets, it is very common that you want to filter rows based on their spat
...nce itself and perform a somewhat costly splitting operation when a node reaches max capacity after an insert, potentially causing additional splits to cascade up the tree. However, when the R-tree index is created on an already populated table, a speci... - https://man.mtool.work/duckdb/2.0/core_extensions/spatial/r-tree_indexes.html
- Command Line Client 7247
- 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.
...on ETA Completion time estimates may be less reliable under these conditions: System resource constraints: Memory pressure causing disk swapping High CPU load from competing processes Disk I/O bottlenecks Query execution characteristics: Variable execut... - https://man.mtool.work/duckdb/2.0/clients/cli/overview.html
- Azure Extension 7247
- The azure extension lets DuckDB read and write files in Azure Blob Storage and Azure Data Lake Storage (ADLS) Gen2. Installing and Loading The azure extension will be transparently autoloaded on first use from the official extension reposit
...underlying Azure SDK HTTP connection in the DuckDB connection context when performing queries. If you suspect that this is causing some side effect, you can try to disable it by setting it to false (not recommended). BOOLEAN true Since v1.5.4, azure_rea... - https://man.mtool.work/duckdb/2.0/core_extensions/azure.html
- Reading and Writing Parquet Files 7247
- Examples Read a single Parquet file: SELECT * FROM 'test.parquet'; Figure out which columns/types are in a Parquet file: DESCRIBE SELECT * FROM 'test.parquet'; Create a table from a Parquet file: CREATE TABLE test AS SELECT * FROM 'test.par
...2.0. BOOL false binary_as_string Parquet files generated by legacy writers do not correctly set the UTF8 flag for strings, causing string columns to be loaded as BLOB instead. Set this to true to load binary columns as strings. BOOL false bound_schema T... - https://man.mtool.work/duckdb/2.0/data/parquet/overview.html
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