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Doc: improve documentation about width_bucket().

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Specify whether the bucket bounds are inclusive or exclusive,
and improve some other vague language.  Explain the behavior that
occurs when the "low" bound is greater than the "high" bound.
Make width_bucket_numeric's comment more like that for
width_bucket_float8, in particular noting that infinite
bounds are rejected (since they became possible in v14).

Reported-by: Ben Peachey Higdon <bpeacheyhigdon@gmail.com>
Author: Robert Treat <rob@xzilla.net>
Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Dean Rasheed <dean.a.rasheed@gmail.com>
Discussion: https://postgr.es/m/2BD74F86-5B89-4AC1-8F13-23CED3546AC1@gmail.com
Backpatch-through: 13
This commit is contained in:
Tom Lane
2025-06-21 12:52:37 -04:00
parent fdd8269223
commit 9575e540f6
3 changed files with 20 additions and 9 deletions
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7
src/backend/utils/adt/numeric.c
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@ -1836,9 +1836,10 @@ generate_series_step_numeric(PG_FUNCTION_ARGS)
* in the histogram. width_bucket() returns an integer indicating the
* bucket number that 'operand' belongs to in an equiwidth histogram
* with the specified characteristics. An operand smaller than the
* lower bound is assigned to bucket 0. An operand greater than the
* upper bound is assigned to an additional bucket (with number
* count+1). We don't allow "NaN" for any of the numeric arguments.
* lower bound is assigned to bucket 0. An operand greater than or equal
* to the upper bound is assigned to an additional bucket (with number
* count+1). We don't allow "NaN" for any of the numeric inputs, and we
* don't allow either of the histogram bounds to be +/- infinity.
*/
Datum
width_bucket_numeric(PG_FUNCTION_ARGS)