Results of 1 - 10 of about 17 for cardinality (0.004 sec.)
- Profiling – DuckDB 14794
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...e blocked EXTRA_INFO string Unique operator metrics LATENCY double seconds The total elapsed query execution time OPERATOR_CARDINALITY uint64 absolute The cardinality of each operator, i.e., the number of rows it returns to its parent. Operator equivalent o...B calculates the cumulative metric. Metric Unit Metric calculated cumulatively CPU_TIME seconds OPERATOR_TIMING CUMULATIVE_CARDINALITY absolute OPERATOR_CARDINALITY CUMULATIVE_ROWS_SCANNED absolute OPERATOR_ROWS_SCANNED CPU_TIME measures the cumulative oper...mat to json . In the first example, we enable profiling and set the output to a file. We only enable EXTRA_INFO , OPERATOR_CARDINALITY , and OPERATOR_TIMING . CREATE TABLE students ( name VARCHAR , sid INTEGER ); CREATE TABLE exams ( eid INTEGER , subject V... - https://man.mtool.work/duckdb/1.3/dev/profiling.html
- Table Functions – DuckDB 10569
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...b_bind_set_bind_data ( duckdb_bind_info info , void * bind_data , duckdb_delete_callback_t destroy ); void duckdb_bind_set_cardinality ( duckdb_bind_info info , idx_t cardinality , bool is_exact ); void duckdb_bind_set_error ( duckdb_bind_info info , const...able function. bind_data : The bind data object. destroy : The callback to destroy the bind data (if any). duckdb_bind_set_cardinality Sets the cardinality estimate for the table function, used for optimization. Syntax void duckdb_bind_set_cardinality ( duc...kdb_bind_info info , idx_t cardinality , bool is_exact ); Parameters info : The bind data object. is_exact : Whether or not the cardinality estimate is exact, or... - https://man.mtool.work/duckdb/1.3/clients/c/table_functions.html
- EXPLAIN ANALYZE: Profile Queries – DuckDB 9449
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...rints the query plan, and executes it, providing run-time performance numbers for every operator, as well as the estimated cardinality ( EC ) and the actual cardinality. EXPLAIN ANALYZE SELECT * FROM tbl ; Note that the cumulative wall-clock time that is sp...──┘ See Also For more information, see the ”Profiling” page . 関連キーワード ││ query students exams time Queries operator cardinality spent processing Documentation Guides Meta Copy Markdown Profile Prepending prints plan executes providing performance num... - https://man.mtool.work/duckdb/1.3/guides/meta/explain_analyze.html
- Map Functions – DuckDB 9207
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...rmat Execution Format Pivot Sitemap Live Demo Documentation / SQL / Functions Copy Markdown Map Functions Name Description cardinality(map) Return the size of the map (or the number of entries in the map). element_at(map, key) Return the value for a given k...map. The type of the key provided in the second parameter must match the type of the map's keys; else, an error is thrown. cardinality(map) Description Return the size of the map (or the number of entries in the map). Example cardinality(map([4, 2], ['a', '... - https://man.mtool.work/duckdb/1.3/sql/functions/map.html
- Configuration – DuckDB 8086
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...ET_SIZE": "true", "OPERATOR_TIMING": "true", "OPERATOR_ROWS_SCANNED": "true", "CUMULATIVE_ROWS_SCANNED": "true", "OPERATOR_CARDINALITY": "true", "OPERATOR_TYPE": "true", "OPERATOR_NAME": "true", "CPU_TIME": "true", "EXTRA_INFO": "true", "SYSTEM_PEAK_BUFFER_...MEMORY": "true", "BLOCKED_THREAD_TIME": "true", "CUMULATIVE_CARDINALITY": "true", "SYSTEM_PEAK_TEMP_DIR_SIZE": "true", "QUERY_NAME": "true"} disable_timestamptz_casts Disable casting from timest... - https://man.mtool.work/duckdb/1.3/configuration/overview.html
- Pragmas – DuckDB 8086
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...always use a default set of metrics. In the following example, the CPU_TIME metric is disabled. The EXTRA_INFO , OPERATOR_CARDINALITY , and OPERATOR_TIMING metrics are enabled. SET custom_profiling_settings = '{"CPU_TIME": "false", "EXTRA_INFO": "true", "O...PERATOR_CARDINALITY": "true", "OPERATOR_TIMING": "true"}' ; The profiling documentation contains an overview of the available metrics . Disabl... - https://man.mtool.work/duckdb/1.3/configuration/pragmas.html
- Join Operations – DuckDB 8086
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...d query optimizer, which uses statistics in the base tables (stored in a DuckDB database or Parquet files) to estimate the cardinality of operations. Turn off the Join Order Optimizer To turn off the join order optimizer, set the following PRAGMA s : SET di... - https://man.mtool.work/duckdb/1.3/guides/performance/join_operations.html
- EXPLAIN: Inspect Query Plans – DuckDB 7966
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...1 │ └───────────────────────────┘ Note that the query is not actually executed – therefore, we can only see the estimated cardinality ( EC ) for each operator, which is calculated by using the statistics of the base tables and applying heuristics for each... - https://man.mtool.work/duckdb/1.3/guides/meta/explain.html
- List Functions – DuckDB 7966
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...epeat the list count times. unnest(list) Unnests a list by one level. Note that this is a special function that alters the cardinality of the result. See the unnest page for more details. list[index] Description Bracket notation serves as an alias for list_...2, 1, 2, 1, 2] unnest(list) Description Unnests a list by one level. Note that this is a special function that alters the cardinality of the result. See the unnest page for more details. Example unnest([1, 2, 3]) Result 1 , 2 , 3 List Operators The followi... - https://man.mtool.work/duckdb/1.3/sql/functions/list.html
- Data Chunks – DuckDB 7845
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...hunk : The data chunk to destroy. duckdb_data_chunk_reset Resets a data chunk, clearing the validity masks and setting the cardinality of the data chunk to 0. After calling this method, you must call duckdb_vector_get_validity and duckdb_vector_get_data to... - https://man.mtool.work/duckdb/1.3/clients/c/data_chunk.html
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