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- Overview of DuckDB Internals 11567
- Tip For a detailed explanation of DuckDB internals, see the Design and Implementation of DuckDB Internals ("DiDi") library entry. On this page is a brief description of the internals of the DuckDB engine. Parser The parser converts a query
...represents, e.g., a comparison is represented as a ComparisonExpression . ParsedExpressions do not have types, except for nodes with explicit types such as CAST statements. The types for expressions are resolved in the Binder, not in the Parser. Tabl...d into multiple SQL statements in case the original query string contains multiple queries. Binder The binder converts all nodes into their bound equivalents. In the binder phase: The tables and columns are resolved using the catalog Types are resolve...ryNode TableRef → BoundStatement ParsedExpression → Expression Logical Planner The logical planner creates LogicalOperator nodes from the bound statements. In this phase, the actual logical query tree is created. Optimizer After the logical planner ha... - https://man.mtool.work/duckdb/2.0/internals/overview.html
- macOS 11025
- Prerequisites Install Xcode and Homebrew . Then, install the required packages with: brew install git cmake ninja Building DuckDB Clone and build DuckDB as follows. git clone https://github.com/duckdb/duckdb cd duckdb GEN=ninja make Once th
...build fails on macOS with the following error: FAILED: third_party/libpg_query/CMakeFiles/duckdb_pg_query.dir/src_backend_nodes_list.cpp.o /Library/Developer/CommandLineTools/usr/bin/c++ -DDUCKDB_BUILD_LIBRARY -DEXT_VERSION_PARQUET=\"9cba6a2a03\" -I/...fPIC -fvisibility=hidden -fcolor-diagnostics -w -MD -MT third_party/libpg_query/CMakeFiles/duckdb_pg_query.dir/src_backend_nodes_list.cpp.o -MF third_party/libpg_query/CMakeFiles/duckdb_pg_query.dir/src_backend_nodes_list.cpp.o.d -o third_party/libpg_...query/CMakeFiles/duckdb_pg_query.dir/src_backend_nodes_list.cpp.o -c /Users/builder/external/duckdb/third_party/libpg_query/src_backend_nodes_list.cpp In file included from /Use... - https://man.mtool.work/duckdb/2.0/dev/building/macos.html
- R-Tree Indexes 10645
- 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
...res the approximate minimum bounding rectangle of each geometry (and the internal ID of the corresponding row) in the leaf nodes, and the bounding rectangle enclosing all of the child nodes in each internal node. The minimum bounding rectangle (MBR) o...rsect a specific region of interest, as you can skip searching entire sub-trees if the bounding rectangles of their parent nodes don't intersect the query region at all. Once the leaf nodes are reached, only the specific rows whose geometries intersec...hm" (Sort-Tile-Recursive) is used, which divides all entries into an already balanced tree as the total number of required nodes can be computed from the beginning. Additionally, using the bulk loading algorithm tends to create a R-tree with a better... - https://man.mtool.work/duckdb/2.0/core_extensions/spatial/r-tree_indexes.html
- WITH Clause 9724
- The WITH clause allows you to specify common table expressions (CTEs). Regular (non-recursive) common-table-expressions are essentially views that are limited in scope to a particular query. CTEs can reference each other and can be nested.
...5, 3), (5, 4), (5, 8), (6, 3), (6, 4), (7, 4), (8, 1), (9, 4); Note that the graph contains directed cycles, e.g., between nodes 1, 5 and 8. Enumerate All Paths from a Node The following query returns all paths starting in node 1: WITH RECURSIVE paths...id -- Prevent adding a node that was visited previously by any path. -- This ensures that (1) no cycles occur and (2) only nodes that -- were not visited by previous (shorter) paths are added to a path. WHERE NOT EXISTS ( FROM paths previous_paths WHE...1, 3] 1 5 [1, 5] 1 8 [1, 3, 8] 1 10 [1, 3, 10] 1 4 [1, 5, 4] 1 8 [1, 5, 8] Enumerate Unweighted Shortest Paths between Two Nodes WITH RECURSIVE can also be used to find all (unweighted) shortest paths between two nodes . To ensure that the recursive q... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/with.html
- Graph Queries 8079
- DuckDB supports graph queries via the DuckPGQ community extension , which implements the SQL/PGQ syntax from the SQL:2023 standard. Warning DuckPGQ is a community extension and is still under active development. It may not be available for
...ABLE ), run: SET active_grammar_extensions = ['duckpgq']; Creating a Property Graph A property graph consists of vertices (nodes) and edges (relationships). You create one as a layer on top of existing tables: CREATE TABLE Person (id BIGINT, name VARC...EFERENCES Person (id) ); Pattern Matching Use the GRAPH_TABLE function with MATCH to find patterns. The syntax uses () for nodes and [] for edges: FROM GRAPH_TABLE (social_network MATCH (a:Person)-[k:Knows]->(b:Person) COLUMNS (a.name AS person1, b.na... - https://man.mtool.work/duckdb/2.0/guides/sql_features/graph_queries.html
- Profile and Monitor 7247
- Overview The Go client can observe query execution: it can retrieve per-operator profiling metrics after a query runs, and register a log storage that receives DuckDB's log messages. Both are described below. Profiling Profiling information
...a tree that mirrors DuckDB's query plan. Each node has a Metrics map of metric name to value and a Children slice of child nodes. Metrics are grouped and named in lowercase: the root's children are the root plan operator, whose metrics include type an... - https://man.mtool.work/duckdb/2.0/clients/go/profiling.html
- Subqueries 7067
- Subqueries are parenthesized query expressions that appear as part of a larger, outer query. Subqueries are usually based on SELECT ... FROM , but in DuckDB other query constructs such as PIVOT can also appear as a subquery. Scalar Subquery
...operator is generally the most useful as a correlated subquery to express antijoin operations. For example, to find Person nodes without an interest: CREATE TABLE Person (id BIGINT, name VARCHAR); CREATE TABLE interest (PersonId BIGINT, topic VARCHAR)... - https://man.mtool.work/duckdb/2.0/sql/expressions/subqueries.html
- Spatial Functions 6868
- 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
...oints (polygon POLYGON_2D) UBIGINT ST_NPoints (box BOX_2D) Description Returns the number of vertices within a geometry ST_Node Signature GEOMETRY ST_Node (geom GEOMETRY) Description Returns a "noded" MultiLinestring, produced by combining a collectio...rotobuf parsing which makes it a lot faster than using the ST_Read() OSM driver, however it only outputs the raw OSM data (Nodes, Ways, Relations), without constructing any geometries. For simple node entities (like PoI's) you can trivially construct...POINT geometries, but it is also possible to construct LINESTRING and POLYGON geometries by manually joining refs and nodes together in SQL, although with available memory usually being a limiting factor. The ST_ReadOSM() function also provides a... - https://man.mtool.work/duckdb/2.0/core_extensions/spatial/functions.html
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