Parse error does not return ORA error

Question

I had a query for a chart that would not parse and did not return an ORA- error to help me find the problem. After some trial and error I was able to identify the source of the error. I was passing a string to the TRUNC function and not a date. I would expect to receive and ORA-1722 with the parse error message but did not. This looks like a small bug to me. If not can someone explain why I would not get an ORA error with this?
test case:
select null link,
8 lbl,
trunc(:P1_DATE,'MONTH') val
from dual;
select null link,
8 lbl,
trunc(to_date(:P1_DATE,'DD-MM-YYYY'),'MONTH') val
from dual;
-Jonathan Stowell

Answer 1

What version of HTML DB? 1.5, but I just upgraded to 1.6, have not tested there yet.
What kind of chart (SVG or HTML and which one)?SVG bar chart
Where did the error occur (on the edit page or at runtime)? Edit page.
What is the exact error you saw? Unable to parse query (OK maybe this is not exact but it defintly did not display and ORA error).
Shouldn't the "val" value be numeric?That was just an example, a bad example aparently.