mingmwang commented on code in PR #4219:
URL: https://github.com/apache/arrow-datafusion/pull/4219#discussion_r1028975418
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datafusion/core/src/execution/context.rs:
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@@ -1228,6 +1228,11 @@ pub struct SessionConfig {
pub collect_statistics: bool,
/// Should DataFusion optimizer run a top down process to reorder the join
keys
pub top_down_join_key_reordering: bool,
+ /// Should DataFusion optimizer prefer HashJoin over SortMergeJoin.
+ /// HashJoin can work more efficently than SortMergeJoin but consumes more
memory.
+ pub prefer_hash_join: bool,
+ /// The maximum estimated size in bytes for the left input a hash join
will be collected into one partition
+ pub hash_join_collect_left_threshold: usize,
Review Comment:
Sure.
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