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Allow underscores in integer and numeric constants.

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This allows underscores to be used in integer and numeric literals,
and their corresponding type input functions, for visual grouping.
For example:

    1_500_000_000
    3.14159_26535_89793
    0xffff_ffff
    0b_1001_0001

A single underscore is allowed between any 2 digits, or immediately
after the base prefix indicator of non-decimal integers, per SQL:202x
draft.

Peter Eisentraut and Dean Rasheed

Discussion: https://postgr.es/m/84aae844-dc55-a4be-86d9-4f0fa405cc97%40enterprisedb.com
This commit is contained in:
Dean Rasheed
2023-02-04 09:48:51 +00:00
parent 1b6f632a35
commit faff8f8e47
22 changed files with 712 additions and 172 deletions
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1
src/backend/catalog/sql_features.txt
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@@ -528,6 +528,7 @@ T653 SQL-schema statements in external routines YES
T654 SQL-dynamic statements in external routines NO
T655 Cyclically dependent routines YES
T661 Non-decimal integer literals YES SQL:202x draft
T662 Underscores in integer literals YES SQL:202x draft
T811 Basic SQL/JSON constructor functions NO
T812 SQL/JSON: JSON_OBJECTAGG NO
T813 SQL/JSON: JSON_ARRAYAGG with ORDER BY NO