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DuckDB 1.3 ドキュメント 全文検索
Results of 1 - 3 of about 3 for zonemaps (0.002 sec.)
- Indexing – DuckDB 11905
- This page is for DuckDB 1.3, which is outdated.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
...ormat Pivot Sitemap Live Demo Documentation / Guides / Performance Copy Markdown Indexing DuckDB has two types of indexes: zonemaps and ART indexes. Zonemaps DuckDB automatically creates zonemaps (also known as min-max indexes) for the columns of all gen...eral-purpose data types . Operations like predicate pushdown into scan operators and computing aggregations use zonemaps. If a filter criterion (like WHERE column1 = 123 ) is in use, DuckDB can skip any row group whose min-max range does not c...., it can omit a block with a min-max range of 1000 to 2000 when comparing for = 123 or < 400 ). The Effect of Ordering on Zonemaps The more ordered the data within a column, the more valuable the zonemap indexes will be. For example, a column could cont... - https://man.mtool.work/duckdb/1.3/guides/performance/indexing.html
- Reading and Writing Parquet Files – DuckDB 8203
- This page is for DuckDB 1.3, which is outdated.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
...quet file, the filter will be pushed down into the scan, and can even be used to skip parts of the file using the built-in zonemaps. Note that this will depend on whether or not your Parquet file contains zonemaps. Filter and projection pushdown provide... - https://man.mtool.work/duckdb/1.3/data/parquet/overview.html
- File Formats – DuckDB 7775
- This page is for DuckDB 1.3, which is outdated.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
...t Files Availability of basic statistics: Parquet files use a columnar storage format and contain basic statistics such as zonemaps . Thanks to these features, DuckDB can leverage optimizations such as projection and filter pushdown on Parquet files. The... - https://man.mtool.work/duckdb/1.3/guides/performance/file_formats.html
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DuckDB 1.3 Documentation / man.mtool.work