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Add section about sequences to README.incompatibilities.3to4.txt (CORE-6084 and CORE-6376).

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Adriano dos Santos Fernandes 2020-08-06 12:33:42 -03:00
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doc/README.incompatibilities.3to4.txt
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@ -54,3 +54,20 @@ Non-constant date/time/timestamp literals
"select timestamp 'now' from rdb$database" will give stalled results.
These strings will not be accepted with the literals syntax anymore.
Start value of sequences
------------------------
* Before v4 sequences were created with its current value set to its start value (or the default zero).
Then a sequence with a start value of 0 and increment 1 started at 1. This example has the same
result in v4 but internals are different, and that makes others cases different.
In v4 sequences are created (or restarted) with its current value set to its start value minus
its increment. And the default start value is changed to 1.
Then a sequence with start value 100 and increment 10 has its first NEXT VALUE equal to 100 in v4,
while it was 110 before.
Likewise this sequence has its first GEN_ID(SEQ, 1) equal 91 in v4, while it was 101 before.