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14
docs/en/operations/settings/settings.md
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@ -1592,19 +1592,19 @@ Default value: `default`.
## parallel_replicas_custom_key_range_lower {#parallel_replicas_custom_key_range_lower}
Allows the filter type `range` to split the work evenly between replicas based on the custom range `[parallel_replicas_custom_key_range_lower, INT_MAX]`.
Allows the filter type `range` to split the work evenly between replicas based on the custom range `[parallel_replicas_custom_key_range_lower, INT_MAX]`.
When used in conjuction with [parallel_replicas_custom_key_range_upper](#parallel_replicas_custom_key_range_upper), it lets the filter evenly split the work over replicas for the range `[parallel_replicas_custom_key_range_lower, parallel_replicas_custom_key_range_upper]`.
When used in conjuction with [parallel_replicas_custom_key_range_upper](#parallel_replicas_custom_key_range_upper), it lets the filter evenly split the work over replicas for the range `[parallel_replicas_custom_key_range_lower, parallel_replicas_custom_key_range_upper]`.
Note: This setting will not cause any additional data to be filtered during query processing, rather it changes the points at which the range filter breaks up the range `[0, INT_MAX]` for parallel processing.
Note: This setting will not cause any additional data to be filtered during query processing, rather it changes the points at which the range filter breaks up the range `[0, INT_MAX]` for parallel processing.
## parallel_replicas_custom_key_range_upper {#parallel_replicas_custom_key_range_upper}
Allows the filter type `range` to split the work evenly between replicas based on the custom range `[0, parallel_replicas_custom_key_range_upper]`. A value of 0 disables the upper bound, setting it the max value of the custom key expression.
When used in conjuction with [parallel_replicas_custom_key_range_lower](#parallel_replicas_custom_key_range_lower), it lets the filter evenly split the work over replicas for the range `[parallel_replicas_custom_key_range_lower, parallel_replicas_custom_key_range_upper]`.
When used in conjuction with [parallel_replicas_custom_key_range_lower](#parallel_replicas_custom_key_range_lower), it lets the filter evenly split the work over replicas for the range `[parallel_replicas_custom_key_range_lower, parallel_replicas_custom_key_range_upper]`.
Note: This setting will not cause any additional data to be filtered during query processing, rather it changes the points at which the range filter breaks up the range `[0, INT_MAX]` for parallel processing.
Note: This setting will not cause any additional data to be filtered during query processing, rather it changes the points at which the range filter breaks up the range `[0, INT_MAX]` for parallel processing.
## allow_experimental_parallel_reading_from_replicas
@ -3188,7 +3188,7 @@ Default value: `0`.
## lightweight_deletes_sync {#lightweight_deletes_sync}
The same as 'mutation_sync', but controls only execution of lightweight deletes.
The same as 'mutation_sync', but controls only execution of lightweight deletes.
Possible values:
@ -5150,7 +5150,7 @@ Allows using statistic to optimize the order of [prewhere conditions](../../sql-
## analyze_index_with_space_filling_curves
If a table has a space-filling curve in its index, e.g. `ORDER BY mortonEncode(x, y)`, and the query has conditions on its arguments, e.g. `x >= 10 AND x <= 20 AND y >= 20 AND y <= 30`, use the space-filling curve for index analysis.
If a table has a space-filling curve in its index, e.g. `ORDER BY mortonEncode(x, y)` or `ORDER BY hilbertEncode(x, y)`, and the query has conditions on its arguments, e.g. `x >= 10 AND x <= 20 AND y >= 20 AND y <= 30`, use the space-filling curve for index analysis.
## query_plan_enable_optimizations {#query_plan_enable_optimizations}

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tests/queries/0_stateless/03171_indexing_by_hilbert_curve.reference Normal file
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tests/queries/0_stateless/03171_indexing_by_hilbert_curve.sql Normal file
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DROP TABLE IF EXISTS test_hilbert_encode_hilbert_encode;
CREATE TABLE test_hilbert_encode (x UInt32, y UInt32) ENGINE = MergeTree ORDER BY hilbertEncode(x, y) SETTINGS index_granularity = 8192, index_granularity_bytes = '1Mi';
INSERT INTO test_hilbert_encode SELECT number DIV 1024, number % 1024 FROM numbers(1048576);
SET max_rows_to_read = 8192, force_primary_key = 1, analyze_index_with_space_filling_curves = 1;
SELECT count() FROM test_hilbert_encode WHERE x >= 10 AND x <= 20 AND y >= 20 AND y <= 30;
SET max_rows_to_read = 8192, force_primary_key = 1, analyze_index_with_space_filling_curves = 0;
SELECT count() FROM test_hilbert_encode WHERE x >= 10 AND x <= 20 AND y >= 20 AND y <= 30; -- { serverError 277 }
DROP TABLE test_hilbert_encode;
-- The same, but with more precise index
CREATE TABLE test_hilbert_encode (x UInt32, y UInt32) ENGINE = MergeTree ORDER BY hilbertEncode(x, y) SETTINGS index_granularity = 1;
SET max_rows_to_read = 0;
INSERT INTO test_hilbert_encode SELECT number DIV 32, number % 32 FROM numbers(1024);
SET max_rows_to_read = 200, force_primary_key = 1, analyze_index_with_space_filling_curves = 1;
SELECT count() FROM test_hilbert_encode WHERE x >= 10 AND x <= 20 AND y >= 20 AND y <= 30;
-- Various other conditions
SELECT count() FROM test_hilbert_encode WHERE x = 10 SETTINGS max_rows_to_read = 64;
SELECT count() FROM test_hilbert_encode WHERE x = 10 AND y > 10 SETTINGS max_rows_to_read = 42;
SELECT count() FROM test_hilbert_encode WHERE x = 10 AND y < 10 SETTINGS max_rows_to_read = 20;
SELECT count() FROM test_hilbert_encode WHERE y = 10 SETTINGS max_rows_to_read = 48;
SELECT count() FROM test_hilbert_encode WHERE x >= 10 AND y = 10 SETTINGS max_rows_to_read = 33;
SELECT count() FROM test_hilbert_encode WHERE y = 10 AND x <= 10 SETTINGS max_rows_to_read = 17;
SELECT count() FROM test_hilbert_encode PREWHERE x >= 10 WHERE x < 11 AND y = 10 SETTINGS max_rows_to_read = 3;
DROP TABLE test_hilbert_encode;