Remove unused session property pushdown_subfields_for_map_subset

Author: hantangwangd

presto-main-base/src/main/java/com/facebook/presto/SystemSessionProperties.java

@@ -337,7 +337,6 @@ public final class SystemSessionProperties
     public static final String QUERY_CLIENT_TIMEOUT = "query_client_timeout";
     public static final String REWRITE_MIN_MAX_BY_TO_TOP_N = "rewrite_min_max_by_to_top_n";
     public static final String ADD_DISTINCT_BELOW_SEMI_JOIN_BUILD = "add_distinct_below_semi_join_build";
-    public static final String PUSHDOWN_SUBFIELDS_FOR_MAP_SUBSET = "pushdown_subfields_for_map_subset";
     public static final String PUSHDOWN_SUBFIELDS_FOR_MAP_FUNCTIONS = "pushdown_subfields_for_map_functions";
     public static final String MAX_SERIALIZABLE_OBJECT_SIZE = "max_serializable_object_size";
 
@@ -1929,10 +1928,6 @@ public SystemSessionProperties(
                         "Optimize out APPROX_DISTINCT operations over constant conditionals",
                         featuresConfig.isOptimizeConditionalApproxDistinct(),
                         false),
-                booleanProperty(PUSHDOWN_SUBFIELDS_FOR_MAP_SUBSET,
-                        "Enable subfield pruning for map_subset function",
-                        featuresConfig.isPushdownSubfieldForMapFunctions(),
-                        false),
                 booleanProperty(PUSHDOWN_SUBFIELDS_FOR_MAP_FUNCTIONS,
                         "Enable subfield pruning for map functions, currently include map_subset and map_filter",
                         featuresConfig.isPushdownSubfieldForMapFunctions(),
@@ -3300,11 +3295,6 @@ public static boolean isEnabledAddExchangeBelowGroupId(Session session)
         return session.getSystemProperty(ADD_EXCHANGE_BELOW_PARTIAL_AGGREGATION_OVER_GROUP_ID, Boolean.class);
     }
 
-    public static boolean isPushSubfieldsForMapSubsetEnabled(Session session)
-    {
-        return session.getSystemProperty(PUSHDOWN_SUBFIELDS_FOR_MAP_SUBSET, Boolean.class);
-    }
-
     public static boolean isPushSubfieldsForMapFunctionsEnabled(Session session)
     {
         return session.getSystemProperty(PUSHDOWN_SUBFIELDS_FOR_MAP_FUNCTIONS, Boolean.class);