Type of the object called several times Oracle constructor

I have an object of type with a custom constructor. In SQL, when I reference attributes the constructor is called several times in Oracle 11.2.0.4.

Why the constructor is called more than once?
How can I stop it?

My current job is about to reference attributes and use the / * + materialize * / tip.

Problem installation

    create or replace type Foo as object
    (
      Bar1 NUMBER,
      Bar2 NUMBER,
      Bar3 NUMBER,

      CONSTRUCTOR FUNCTION Foo(p_Bar1 NUMBER, p_Bar2 NUMBER, p_Bar3 NUMBER)
        RETURN SELF AS RESULT
        DETERMINISTIC
    )
/
    create or replace type body Foo is

      -- Member procedures and functions
      CONSTRUCTOR FUNCTION Foo(p_Bar1 NUMBER, p_Bar2 NUMBER, p_Bar3 NUMBER)
        RETURN SELF AS RESULT
        DETERMINISTIC
      AS
      BEGIN
        SELF.Bar1 := p_Bar1;
        SELF.Bar2 := p_Bar2;
        SELF.Bar3 := p_Bar3;
        dbms_output.put_line('Foo Constructor Called');
        RETURN;
      END;

    end;

Problem

    -- Constructor is called 6 times! 
    -- Once for each column and once for each predicate in the where clause.
    SELECT x.f.bar1 AS bar1, x.f.bar2 AS bar2, x.f.bar3 AS bar3, f
    FROM (
      SELECT foo(p_Bar1 => 1, p_Bar2 => 2, p_Bar3 => 3) f
      FROM dual d
    ) x
    WHERE x.f.bar1 = x.f.bar1 AND x.f.bar2 = x.f.bar2

Output

Foo constructor called

Workaround

    -- Work Around
    -- Constructor is called 3 times
    -- Once for each column in the inline view. 
    -- Note, I removed column f (the object type) because it's not compatible with the materialize hint.
    WITH y AS (
      SELECT /*+ materialize */ x.f.bar1 AS bar1, x.f.bar2 AS bar2, x.f.bar3 AS bar3
      FROM (
        SELECT foo(p_Bar1 => 1, p_Bar2 => 2, p_Bar3 => 3) f
        FROM dual d
      ) x
    )
    SELECT y.bar1, y.bar2, y.bar3
    FROM y
    WHERE y.bar1 = y.bar1 AND y.bar2 = y.bar2

Another solution is described in this thread... Access to the fields of an object custom type... which makes use of a type of collection combined with SCOREBOARD operator, like this...

create or replace type FooTable as table of Foo;

SELECT x.bar1 AS bar1, x.bar2 AS bar2, x.bar3 AS bar3, value(x) f
    FROM table(FooTable(
      foo(p_Bar1 => 1, p_Bar2 => 2, p_Bar3 => 3)
    )) x
    WHERE x.bar1 = x.bar1 AND x.bar2 = x.bar2
;

BAR1 BAR2 BAR2 F
1    2    3    (1, 2, 3)

Foo Constructor Called

Hope that helps...

Gerard

Tags: Database

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