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https://issues.apache.org/jira/browse/IGNITE-1630?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179821#comment-15179821
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Pavel Tupitsyn edited comment on IGNITE-1630 at 3/4/16 2:03 PM:
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1) Fixed
2) I agree with you, it just happens that only configuration property setters
call this method, so for all cases we need a warning.
I have renamed the method to indicate the purpose better, and updated the
warning text.
3) As I said, this concept is from Entity Framework, and is familiar to the
users.
Non-compiled query (expression tree parse overhead on each run):
{code}
var qry = cache.AsCacheQueryable().Where(x=>x.Key > 10);
var result = qry.ToArray();
{code}
Compiled query (zero overhead):
{code}
Func<int> compiledQry = CompiledQuery.Compile((int k) =>
cache.AsCacheQueryable().Where(x => x.Key > k));
var result = compiledQry(10).ToArray();
{code}
New versions of Entity Framework, as well as NHibernate, provide automatic
query plan caching to minimize expression tree parsing overhead. But the
problem is to generate proper cache key from the expression tree, which takes
some time.
We may try to do the same as a separate task. But CompiledQuery will always be
the fastest way to run LINQ queries. Users may want this.
4) Fixed.
was (Author: ptupitsyn):
1) Fixed
2) I agree with you, it just happens that only configuration property setters
call this method, so for all cases we need a warning.
I have renamed the method to indicate the purpose better, and updated the
warning text.
3) As I said, this concept is from Entity Framework, and is familiar to the
users.
Non-compiled query (expression tree parse overhead on each run):
{code}
var qry = cache.AsCacheQueryable().Where(x=>x.Key > 10);
var result = qry.ToArray();
{code}
Compiled query:
{code}
Func<int> compiledQry = CompiledQuery.Compile((int k) =>
cache.AsCacheQueryable().Where(x => x.Key > k));
var result = compiledQry(10).ToArray();
{code}
4) Fixed.
> .Net: Create LINQ adapter for queries.
> --------------------------------------
>
> Key: IGNITE-1630
> URL: https://issues.apache.org/jira/browse/IGNITE-1630
> Project: Ignite
> Issue Type: Task
> Components: platforms
> Affects Versions: ignite-1.4
> Reporter: Vladimir Ozerov
> Assignee: Pavel Tupitsyn
> Priority: Critical
> Fix For: 1.6
>
>
> SQL queries are one of the most frequently used features in data grids. And
> .Net comes with a very nice LINQ concept.
> * LINQ provider should come in a separate assembly
> * Make sure that assembly is included in binary distribution
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