[ http://issues.apache.org/jira/browse/OFBIZ-336?page=all ]
Si Chen updated OFBIZ-336:
--------------------------
Attachment: (was: complex-alias-default-value.patch)
> Improve complex-alias to handle nulls and defaults
> --------------------------------------------------
>
> Key: OFBIZ-336
> URL: http://issues.apache.org/jira/browse/OFBIZ-336
> Project: OFBiz (The Open for Business Project)
> Issue Type: Improvement
> Components: framework
> Reporter: Leon Torres
> Priority: Minor
> Attachments: complex-alias-default-value2.patch
>
>
> The idea behind complex-alias is useful for certain things, but the way it
> works now is not useful. Suppose you build a simple addition rule. If any
> variable in the equation is null, the entire alias resolves to null.
> For example, suppose you create a view entity to report quantities on
> OrderItem. The query would be:
> select product_id, (quantity - cancel_quantity) from order_item;
> However if you run this, you'll see that where quantity or cancel_quantity
> are null, the result is null. A solution in postgresql is to use the
> coalesce function to specify a default value:
> select product_id, (coalesce(quantity, 0) - coalesce(cancel_quantity, 0))
> from order_item;
> Now the query works.
> So the fix I think is to add another attribute default-value="something". If
> the default-value is present, then add the coalesce function. Not sure
> whether this is standard sql or not.
> I also encountered this issue for concatenation || operator, so I think it
> affects most operations.
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