[id='querying-protostream-common-types_{context}']
= Querying ProtoStream common types
Perform Ickle queries on caches that store data as ProtoStream common types such as `BigInteger` and `BigDecimal`.

.Procedure
. Add indexing annotations to your class, as in the following example:
+
[source,java]
----
@Indexed
public class CalculusIndexed {
    @Basic
    @ProtoField(value = 1)
    public BigInteger getPurchases() {
      return purchases;
    }

    @Decimal // the scale is 2 by default
    @ProtoField(value = 2)
    public BigDecimal getProspect() {
      return prospect;
    }
}
----

. Set the `dependsOn` attribute to `CommonTypes.class` to indicate that the generated Protobuf schema can reference and use `CommonTypes` types such as `BigInteger` and `BigDecimal`:
+
[source,java]
----
@ProtoSchema(includeClasses = CalculusIndexed.class, dependsOn = CommonTypes.class,
     schemaFilePath = "/protostream", schemaFileName = "calculus-indexed.proto",
     schemaPackageName = "lab.indexed")
public interface CalculusIndexedSchema extends GeneratedSchema {
}
----
+
. Perform queries:
+
[source]
----
Query<Product> query = cache.query("from lab.indexed.CalculusIndexed c where c.purchases > 9");
QueryResult<Product> result = query.execute();
// play with the result

query = cache.query("from lab.indexed.CalculusIndexed c where c.prospect = 2.2");
result = query.execute();
// play with the result
----

[role="_additional-resources"]
.Additional resources
* link:{encoding_docs}#protostream-types_marshalling[ProtoStream Types Marshalling]
