Add a test that exercises to_metrics_histogram when Min is smaller than
Precision.
The test verifies duplicate integer bounds are collapsed,
counts remain cumulative, and native histogram metadata is still present
with the expected schema and min id.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Add three test cases to verify the hybrid linear/exponential bucketing:
- test_histogram_min_1_bucket_limits: Validates bucket lower limits
- test_histogram_min_1_basic: Tests value insertion and bucket distribution
- test_histogram_min_1_statistics: Tests min(), max(), quantile(), and mean()
- test_histogram_min_2_precision_4: Test min == 2 and precision 4.
These tests cover the new Min<Precision mode with Precision=4, verifying both the
linear range and exponential range.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Now that the sum function in the histogram uses true values instead of
an estimate, the test should reflect that.
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
This patch adds tests for summary calculation. It adds two tests, the
first is a basic calculation for P50, P95, P99 by adding 100 elements
into 20 buckets.
The second test look that if elements are found in the infinite bucket,
the result would be the lower limit (33s) and not infinite.
Relates to #20255
Signed-off-by: Amnon Heiman <amnon@scylladb.com>
Instead of lengthy blurbs, switch to single-line, machine-readable
standardized (https://spdx.dev) license identifiers. The Linux kernel
switched long ago, so there is strong precedent.
Three cases are handled: AGPL-only, Apache-only, and dual licensed.
For the latter case, I chose (AGPL-3.0-or-later and Apache-2.0),
reasoning that our changes are extensive enough to apply our license.
The changes we applied mechanically with a script, except to
licenses/README.md.
Closes#9937
This patch aim to make the implementation and usage of the
approx_exponential_histogram clearer.
The approx_exponential_histogram Uses a combination of Min, Max,
Precision and number of buckets where the user needs to pick 3.
Most of the changes in the patch are about documenting the class and
method, but following the review there are two functionality changes:
1. The user would pick: Min, Max and Precision and the number of buckets
will be calculated from these values.
2. The template restrictions are now state in a requires so voiolation
will be stop at compile time.
