Generated SQL statement contains unnecessary cast

Question

I have a table containing a column of type decimal(10,0). Generated entity model maps this to a int32. When I perform a query on this field, for example
test.Where(p => p.id = 10)
the generated query contains the following
where (Cast(id as number (19,0)) = 10)
the prevents the server from using indexes on this column.
How can i prevent this unnecessary cast?

Answer 1

I follow your description but cannot reproduce the extra casting in the WHERE clause in the generated SQL.
Are you using the lastest ODAC production version (11.2.0.3) ?
When id column is defined as decimal(10, 0), it's indeed mapped to Int32 as you described.
That's because decimal(10, 0) is actually number(10).
10 is Int32 by default and ID column is already mapped to Int32. I don't see there is casting.
The only way I can reproduce the extra casting is explicitly adding decimal casting to 10. For example,
test.Where(p => p.id == (decimal) 10)
Then I got the following:
WHERE (10 = ( CAST( "Extent1"."ID" AS number(19,0))))
But I don't think that's what you did.
Would you please provide more details?