andygrove commented on code in PR #1906:
URL:
https://github.com/apache/datafusion-ballista/pull/1906#discussion_r3488107332
##########
ballista/core/src/extension.rs:
##########
@@ -789,6 +789,22 @@ impl SessionConfigHelperExt for SessionConfig {
//
// See https://github.com/apache/datafusion-ballista/issues/1648
.set_bool("datafusion.optimizer.prefer_hash_join", false)
+ //
+ // DataFusion 54 plans uncorrelated scalar subqueries as a physical
+ // `ScalarSubqueryExec` wrapping a `ScalarSubqueryExpr` that reads
an
+ // in-process shared results container. That container cannot cross
+ // process or stage boundaries, and `datafusion-proto` can only
+ // deserialize the expr inside its surrounding exec, so when
Ballista
+ // splits a plan into stages the expr is serialized without its
exec
+ // and the executor fails to decode it. Disabling this option makes
+ // the optimizer rewrite uncorrelated scalar subqueries to joins,
+ // which Ballista distributes correctly.
+ //
+ // See https://github.com/apache/datafusion-ballista/issues/1909
+ .set_bool(
+
"datafusion.optimizer.enable_physical_uncorrelated_scalar_subquery",
+ false,
+ )
Review Comment:
I filed follow on issue
https://github.com/apache/datafusion-ballista/issues/1910 to optimize this
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