andygrove commented on code in PR #1900:
URL: 
https://github.com/apache/datafusion-ballista/pull/1900#discussion_r3488163771


##########
ballista/core/src/extension.rs:
##########
@@ -760,18 +760,15 @@ impl SessionConfigHelperExt for SessionConfig {
             // same like previous comment
             .set_bool("datafusion.sql_parser.map_string_types_to_utf8view", 
false)
             //
-            // As mentioned in 
https://github.com/apache/datafusion-ballista/issues/1055
-            // "Left/full outer join incorrect for CollectLeft / broadcast"
-            //
-            // In order to make correct results (decreasing performance) 
CollectLeft
-            // has been disabled until fixed
+            // A build side smaller than these thresholds is collected into a
+            // CollectLeft (broadcast) hash join rather than being 
repartitioned.
             .set_u64(
                 "datafusion.optimizer.hash_join_single_partition_threshold",
-                0,
+                10 * 1024 * 1024,

Review Comment:
   https://github.com/apache/datafusion-ballista/issues/1055 is fixed now, so 
we can revert the workaround



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