| Ticket Hash: | 3289ab045023f78a6553d7113c202413838ea122 | ||
| Title: | Bad performance of query generation for Contains | ||
| Status: | Deferred | Type: | Performance |
| Severity: | Important | Priority: | Medium |
| Subsystem: | LINQ | Resolution: | Open |
| Last Modified: |
2015-05-16 23:16:38 10.13 years ago |
Created: |
2015-04-19 18:03:20 10.20 years ago |
| Version Found In: | 1.0.93 | ||
| User Comments: | ||||
anonymous added on 2015-04-19 18:03:20:
The SQL query generation for Contains() is very bad for large arrays (it is actually much slower than the query itself). The problem is described here: https://entityframework.codeplex.com/workitem/245 Entity Framework 6.0 added support for explicit generation of DbInExpression. But as SQLite EF provider does not handle DbInExpression, the feature is not used. Instead, an OR-subtree is back-translated to IN again. Would it be possible to add proper support for DbInExpression to reduce the query generation time? It should not be too difficult (as far as I can see). Thank you. | ||||