eejbyfeldt commented on code in PR #13249:
URL: https://github.com/apache/datafusion/pull/13249#discussion_r1834443482
##########
datafusion/optimizer/src/simplify_expressions/expr_simplifier.rs:
##########
@@ -1675,12 +1675,34 @@ impl<'a, S: SimplifyInfo> TreeNodeRewriter for
Simplifier<'a, S> {
}
}
+ // null <op> A --> null,
+ Expr::BinaryExpr(BinaryExpr {
+ left,
+ op: Eq | NotEq | Gt | GtEq | Lt | LtEq,
+ right: _,
+ }) if always_null(&left, info) =>
Transformed::yes(lit_bool_null()),
+
+ // A <op> null --> null,
+ Expr::BinaryExpr(BinaryExpr {
+ left: _,
+ op: Eq | NotEq | Gt | GtEq | Lt | LtEq,
+ right,
+ }) if always_null(&right, info) =>
Transformed::yes(lit_bool_null()),
+
// no additional rewrites possible
expr => Transformed::no(expr),
})
}
}
+fn always_null<S: SimplifyInfo>(expr: &Expr, info: &S) -> bool {
+ is_null(expr)
Review Comment:
Do we still need these change now that we produce use null columns of the
correct type instead of `DataType::Null`?
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
---------------------------------------------------------------------
To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org
For additional commands, e-mail: github-h...@datafusion.apache.org
