[NO ISSUE][COMP] Align SecondaryCorrelatedBTreeOperationsHelper with SecondaryBTreeOperationsHelper

- user model changes: no
- storage format changes: no
- interface changes: no

Details:
Align SecondaryCorrelatedBTreeOperationsHelper with SecondaryBTreeOperationsHelper
in terms of handling CAST modifier. Cast only the indexed fields and
remove casting the whole dataset record similar to SecondaryBTreeOperationsHelper.
Similarly, Handle INCLUDE/EXCLUDE UNKNOWN KEY when bulk loading secondary indexes on
correlated datasets.

- Refactor methods for sharing:
  createFieldAccessor(), createFieldCast(), createConstructorFunction(), excludeUnknownKeys()
- Make the built type for the overridden fields with CAST modifier nullable

Change-Id: Ieff55b1a3e3dbc965f7108f7e2ca86f92d5a8a55
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/14385
Integration-Tests: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Ali Alsuliman <ali.al.solaiman@gmail.com>
Reviewed-by: Dmitry Lychagin <dmitry.lychagin@couchbase.com>
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
index 8801ce7..edd3418 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
@@ -4316,6 +4316,11 @@
       </compilation-unit>
     </test-case>
     <test-case FilePath="ddl">
+      <compilation-unit name="index-cast-null-correlated">
+        <output-dir compare="Text">index-cast-null-correlated</output-dir>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="ddl">
       <compilation-unit name="index-cast-null-negative">
         <output-dir compare="Text">index-cast-null-negative</output-dir>
         <expected-error>CAST modifier is only allowed for B-Tree indexes</expected-error>
@@ -6535,6 +6540,11 @@
         <output-dir compare="Text">cast-default-null</output-dir>
       </compilation-unit>
     </test-case>
+    <test-case FilePath="index-selection">
+      <compilation-unit name="cast-default-null-correlated">
+        <output-dir compare="Text">cast-default-null-correlated</output-dir>
+      </compilation-unit>
+    </test-case>
   </test-group>
   <test-group name="inverted-index-join-noeqjoin">
     <test-case FilePath="inverted-index-join-noeqjoin">