computed field has null value inside BI trigger
-----------------------------------------------

                 Key: CORE-4201
                 URL: http://tracker.firebirdsql.org/browse/CORE-4201
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 3.0 Alpha 1, 2.5.3
            Reporter: Gorynich


CREATE TABLE NEW_TABLE (
    NEW_FIELD1  INTEGER NOT NULL,
    COMP_FIELD COMPUTED BY (NEW_FIELD1+1),
    NEW_FIELD2  INTEGER
);

SET TERM ^ ;

CREATE TRIGGER NEW_TABLE_BI0 FOR NEW_TABLE
ACTIVE BEFORE INSERT POSITION 0
as
begin
  new.New_Field2 = new.Comp_Field;
end
^
SET TERM ; ^


INSERT INTO NEW_TABLE (NEW_FIELD1)
VALUES (1);

NEW_FIELD1 - 1
COMP_FIELD - 2
NEW_FIELD2 - null ???????????  why ?

Firebird-2.5.2.26540

NEW_FIELD1 - 1
COMP_FIELD - 2
NEW_FIELD2 - 2   OK :)


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