Add Expr::InSubquery and Expr::ScalarSubquery
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andygrove
changed the title
Expr::InSubquery and Expr::ScalarSubqueryExpr::InSubquery and Expr::ScalarSubquery
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alamb
approved these changes
Apr 26, 2022
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Looking very nice @andygrove
All aboard the subquery 🚂 !
I had a few stylistic / corner case comments but nothing that can't be addressed after merge as a follow on PR
datafusion/expr/src/expr_schema.rs
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| Expr::IsNull(_) | ||
| | Expr::IsNotNull(_) | ||
| | Expr::Exists { .. } | ||
| | Expr::InSubquery { .. } => Ok(false), |
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I think aIN can be nullable if its exprs are nullable:
alamb=# select null IN (select * from a);
?column?
----------
(1 row)So maybe Expr::InSubquery should return expr.nullable(input_schema) too
| subquery, | ||
| negated, | ||
| } => Ok(Expr::InSubquery { | ||
| expr: Box::new(clone_with_replacement(&**nested_expr, replacement_fn)?), |
| | Expr::Exists(_) | ||
| | Expr::Exists { .. } | ||
| | Expr::InSubquery { .. } | ||
| | Expr::ScalarSubquery(_) |
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at some point it would be cool to be able to evaluate scalar subqueries at plan time, "but not now" 😆
Co-authored-by: Andrew Lamb <[email protected]>
Co-authored-by: Andrew Lamb <[email protected]>
alamb
approved these changes
Apr 26, 2022
datafusion/expr/src/expr.rs
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Comment on lines
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| Expr::InSubquery { | ||
| expr, | ||
| subquery, | ||
| negated, | ||
| } => { | ||
| if *negated { | ||
| write!(f, "{:?} NOT IN ({:?})", expr, subquery) | ||
| } else { | ||
| write!(f, "{:?} IN ({:?})", expr, subquery) | ||
| } | ||
| } |
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The same negated: true / negated: false could be applied to Expr::InSubquery as was applied to Expr::Exists
|
🎉 |
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Which issue does this PR close?
Part of #2248
Rationale for this change
Add
InSubqueryandScalarSubquerytoExpras a step towards supporting SQL queries that use these expressions.What changes are included in this PR?
InSubqueryandScalarSubquerytoExprAre there any user-facing changes?
Yes, API change