Dandandan commented on code in PR #24456:
URL: https://github.com/apache/datafusion/pull/24456#discussion_r3824504729
##########
datafusion/common/src/config.rs:
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@@ -1672,6 +1672,22 @@ config_namespace! {
/// query is used.
pub join_reordering: bool, default = true
+ /// When set to true, the physical plan optimizer enumerates join
orders for
+ /// subtrees of joins and picks the cheapest from cardinality
estimates,
+ /// considering bushy shapes as well as left-deep ones. Subtrees whose
inputs
+ /// lack row count statistics are left untouched.
+ pub join_enumeration: bool, default = true
+
+ /// How much cheaper an enumerated join order must be, in percent,
before it
Review Comment:
Yeah - my goal would be to mostly bring this down as well (i.e. remove or
accept the regression).
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