Add 'paged' support for reference attribute fields.

The memory usage of a reference attribute can be calculated as follows:
num_child_docs * 8 + num_parent_docs * 24 + num_child_docs_where_parent_reference_is_set * 4.

When using 'paged' the btrees used in the reverse mapping from parent lid to child lids are still memory allocated.
This is the num_child_docs_where_parent_reference_is_set part of the equation above.

1 files changed, 10 insertions, 4 deletions

diff --git a/config-model/src/test/java/com/yahoo/schema/processing/PagedAttributeValidatorTestCase.java b/config-model/src/test/java/com/yahoo/schema/processing/PagedAttributeValidatorTestCase.java
index 2a3a3ff93e9..719db2ffdcc 100644
--- a/config-model/src/test/java/com/yahoo/schema/processing/PagedAttributeValidatorTestCase.java
+++ b/config-model/src/test/java/com/yahoo/schema/processing/PagedAttributeValidatorTestCase.java
@@ -59,8 +59,14 @@ public class PagedAttributeValidatorTestCase {
     }
 
     private void assertPagedSupported(String fieldType) throws ParseException {
-        var appBuilder = createFromString(getSd(fieldType));
-        var attribute = appBuilder.getSchema().getAttribute("foo");
+        assertPagedSupported(fieldType, Optional.empty());
+    }
+
+    private void assertPagedSupported(String fieldType, Optional<String> parentSd) throws ParseException {
+        var appBuilder = parentSd.isPresent() ?
+                createFromStrings(new BaseDeployLogger(), parentSd.get(), getSd(fieldType)) :
+                createFromString(getSd(fieldType));
+        var attribute = appBuilder.getSchema("test").getAttribute("foo");
         assertTrue(attribute.isPaged());
     }
 
@@ -75,8 +81,8 @@ public class PagedAttributeValidatorTestCase {
     }
 
     @Test
-    void reference_attribute_does_not_support_paged_setting() throws ParseException {
-        assertPagedSettingNotSupported("reference<parent>", Optional.of(getSd("parent", "int")));
+    void reference_attribute_support_paged_setting() throws ParseException {
+        assertPagedSupported("reference<parent>", Optional.of(getSd("parent", "int")));
     }
 
     private void assertPagedSettingNotSupported(String fieldType) throws ParseException {