CREATE SEQUENCE START WITH has wrong initial value
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Key: CORE-6084
URL: http://tracker.firebirdsql.org/browse/CORE-6084
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 4.0 Beta 1, 3.0.4
Reporter: Mark Rotteveel
When using CREATE SEQUENCE seq_name START WITH n [INCREMENT BY x], then the
first value generated by the sequence is n + x (where x = 1 when the INCREMENT
BY clause is absent). This is wrong: the first value produced should be n. See
also "9.29 Generation of the next value of a sequence generator" in SQL:2016.
Examples
CREATE SEQUENCE seq_name START WITH 1;
SELECT NEXT VALUE FOR seq_name FROM rdb$database;
-- Result = 2
-- Expected = 1
CREATE SEQUENCE seq_name START WITH 1 INCREMENT BY 2;
SELECT NEXT VALUE FOR seq_name FROM rdb$database;
-- Result = 3
-- Expected = 1
This problem also affects ALTER SEQUENCE RESTART WITH n (see CORE-4349)
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