cpcloud commented on a change in pull request #11243:
URL: https://github.com/apache/arrow/pull/11243#discussion_r717040533
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File path: experimental/computeir/Relation.fbs
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@@ -120,10 +120,10 @@ table Join {
left: Relation (required);
/// Right relation
right: Relation (required);
- /// The expression which will be evaluated against rows from each
+ /// Conjunction of expressions that will be evaluated against rows from each
/// input to determine whether they should be included in the
/// join relation's output.
- on_expression: Expression (required);
+ predicates: [Expression] (required);
Review comment:
> This may be a foolish question but what do we gain from allowing a
list of expressions
Not foolish at all, thanks for asking. The goal is to mainly to make it a
less annoying to deal with predicates that are already in list form, such as
here
https://github.com/duckdb/duckdb/pull/2331/files#diff-5ad901777f48a6ceb50fe357b6b76fbca1b512fe079a97576cb6c1c1a5f7b951R418-R425.
> combined by an implicit conjunction (AND? OR?)
Conjunction is `AND`, disjunction is `OR`. Here it's an implicit
conjunction, so `AND`.
> Couldn't the conjunction just be supplied explicitly by the producer?
The question is whether most consumers/producers will be bringing a list of
predicates or will have them already `AND`ed together and how they want to work
with those predicates.
FWIW I'm fine not merging this PR, since it just makes code a little uglier
and as of now doesn't prevent any functionality from working.
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