SERVER-125617 Enable path arrayness for calibration suite (#52748)

GitOrigin-RevId: fe0e214a00a15bb6992bda16a21a022a65fb2401

buildscripts/cost_model/join_calibration_settings.py

@@ -108,7 +108,10 @@ def create_join_collection_template(
                 indexed=False,
             ),
         ],
-        compound_indexes=[],
+        # Need an index for multikeyness info
+        compound_indexes=[
+            ["dummy", "unique", "random", "uniform_16", "uniform_256", "uniform_4k", "uniform_64k"]
+        ],
         cardinalities=[COLLECTION_CARDINALITY],
     )
 

buildscripts/cost_model/join_start.py

@@ -488,6 +488,8 @@ async def main():
             "internalMeasureQueryExecutionTimeInNanoseconds=true",
             "--setParameter",
             "internalEnableJoinOptimization=true",
+            "--setParameter",
+            "featureFlagPathArrayness=true",
         ],
     ) as manager:
         generator = DataGenerator(manager.database, join_data_generator)