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Support RN (roman-numeral format) in to_number().

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We've long had roman-numeral output support in to_char(),
but lacked the reverse conversion.  Here it is.

Author: Hunaid Sohail <hunaidpgml@gmail.com>
Reviewed-by: Maciek Sakrejda <m.sakrejda@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Tomas Vondra <tomas@vondra.me>
Discussion: https://postgr.es/m/CAMWA6ybh4M1VQqpmnu2tfSwO+3gAPeA8YKnMHVADeB=XDEvT_A@mail.gmail.com
This commit is contained in:
Tom Lane
2025-01-22 15:18:40 -05:00
parent f0ee648527
commit 172e6b3adb
4 changed files with 350 additions and 53 deletions
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33
src/test/regress/sql/numeric.sql
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@@ -1085,6 +1085,39 @@ SELECT to_number('1234.56','L99,999.99');
SELECT to_number('1,234.56','L99,999.99');
SELECT to_number('42nd', '99th');
SELECT to_number('123456', '99999V99');
-- Test for correct conversion between numbers and Roman numerals
WITH rows AS
(SELECT i, to_char(i, 'RN') AS roman FROM generate_series(1, 3999) AS i)
SELECT
bool_and(to_number(roman, 'RN') = i) as valid
FROM rows;
-- Some additional tests for RN input
SELECT to_number('CvIiI', 'rn');
SELECT to_number('MMXX ', 'RN');
SELECT to_number(' XIV', ' RN');
SELECT to_number(' XIV ', ' RN');
SELECT to_number('M CC', 'RN');
-- error cases
SELECT to_number('viv', 'RN');
SELECT to_number('DCCCD', 'RN');
SELECT to_number('XIXL', 'RN');
SELECT to_number('MCCM', 'RN');
SELECT to_number('MMMM', 'RN');
SELECT to_number('VV', 'RN');
SELECT to_number('IL', 'RN');
SELECT to_number('VIX', 'RN');
SELECT to_number('LXC', 'RN');
SELECT to_number('DCM', 'RN');
SELECT to_number('MMMDCM', 'RN');
SELECT to_number('CLXC', 'RN');
SELECT to_number('CM', 'MIRN');
SELECT to_number('CM', 'RNRN');
SELECT to_number('qiv', 'RN');
SELECT to_number('', 'RN');
SELECT to_number(' ', 'RN');
RESET lc_numeric;
--