Why do you need case classes?
It is possible to use usual classes?
Here my code that works:
import org.apache.ignite.cache.query.annotations.{QuerySqlField,
QueryTextField}
import scala.annotation.meta.field
/**
* Scala wrappers for java SQL annotations.
*/
object SqlAnnotations {
type ScalaCacheQueryTextField = QueryTextField @field
type ScalaCacheQuerySqlField = QuerySqlField @field
type ScalaCacheQuerySqlFieldGroup = QuerySqlField.Group @field
}
class Card(
@ScalaCacheQuerySqlField(index = true) val cardId: Long = 0L,
@ScalaCacheQuerySqlField(index = true) val cardNumber: String = null,
}
Could you try this approach?
On Fri, Apr 1, 2016 at 3:30 PM, F7753 <mabiao...@foxmail.com> wrote:
> Here are some details:
> I created the case class A which parameter is less than 22 and the case
> class B which has more than 22 parameters, I want to let ignite to create
> index on the fields , so the case class is like:
>
> ---------------------------------------------------------------------------------------------------------------------
> case class A (
> @ScalarCacheQuerySqlField field0: String,
> @ScalarCacheQuerySqlField field1: BigInt,
> @ScalarCacheQuerySqlField field2: String,
> ....
> @ScalarCacheQuerySqlField field15: String,
> )
> case class B (
> @ScalarCacheQuerySqlField field0: String,
> @ScalarCacheQuerySqlField field1: BigInt,
> @ScalarCacheQuerySqlField field2: String,
> ....
> @ScalarCacheQuerySqlField field50: String,
> )
>
> -------------------------------------------------------------------------------------------------------------------
> then I use maven to compile the project, it alert the error:
>
> error: Implementation restriction: case classes cannot have more than 22
> parameters.
>
> I found that in scala2.10 you can just create no more than 22 parameters in
> a case class, so I try to use StructType to see whether it can solve this,
> the code is like:
>
> --------------------------------------------------------------------------------------------------------------------
> object Schema{
> val A = StructType( Array(
> StructField("field0", StringType),
> StructField("field1", LongType),
> .....
> StructField("field15", StringType),
> )
> val B = StructType( Array(
> StructField("field0", StringType),
> StructField("field1", LongType),
> .....
> StructField("field50", StringType),
> )
> }
>
> --------------------------------------------------------------------------------------------------------------------
>
> How to add the annotation '@ScalarCacheQuerySqlField' ?
>
>
>
> --
> View this message in context:
> http://apache-ignite-users.70518.x6.nabble.com/How-to-solve-the-22-parameters-limit-under-scala-2-10-in-the-case-class-tp3847p3849.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>
--
Alexey Kuznetsov
GridGain Systems
www.gridgain.com
