kosiew commented on code in PR #18842:
URL: https://github.com/apache/datafusion/pull/18842#discussion_r2548695901
##########
datafusion/substrait/src/logical_plan/consumer/rel/read_rel.rs:
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@@ -121,57 +121,50 @@ pub async fn from_read_rel(
}));
}
+ // Check for produce_one_row pattern in both old (values) and new
(expressions) formats.
+ // A VirtualTable with exactly one row containing only
empty/default fields represents
+ // an EmptyRelation with produce_one_row=true. This pattern is
used for queries without
Review Comment:
Added a reference to the dual table concept - figured it might help folks
coming FROM DUAL backgrounds 😉 Thanks for the nudge!
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