[hibernate-issues] [Hibernate-JIRA] Created: (HHH-4495) postgres dialect maps java double to float8 which rounds to 12dp

[Paul Stanton (JIRA)]

postgres dialect maps java double to float8 which rounds to 12dp
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                 Key: HHH-4495
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4495
             Project: Hibernate Core
          Issue Type: Bug
          Components: core
    Affects Versions: 3.3.1
         Environment: hibernate 3.3.1, postgres 8.4
            Reporter: Paul Stanton
            Priority: Critical


pardon my lackluster description, more info can be found here:
https://forum.hibernate.org/viewtopic.php?f=1&t=1000364

CREATE TABLE tbl (col numeric);
insert into tbl values (151.33160591125488);
select col, cast (col as float8) from tbl;
=151.33160591125488,151.331605911255

^ therefore float8 will round, whereas numeric won't

org.hibernate.dialect.PostgreSQLDialect:
    registerColumnType( Types.DOUBLE, "float8" );

^ this leads to higher scale doubles being rounded

workarounds appreciated

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