waynexia commented on code in PR #8105:
URL: https://github.com/apache/arrow-datafusion/pull/8105#discussion_r1388067070
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datafusion/expr/src/expr_fn.rs:
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@@ -99,6 +99,19 @@ pub fn placeholder(id: impl Into<String>) -> Expr {
})
}
+/// Create an '*' [`Expr::Wildcard`] expression that matches all columns
+///
+/// # Example
+///
+/// ```rust
+/// # use datafusion_expr::{wildcard};
+/// let p = wildcard();
+/// assert_eq!(p.to_string(), "*")
+/// ```
+pub fn wildcard() -> Expr {
+ Expr::Wildcard { qualifier: None }
+}
Review Comment:
Do we need a `fn wildcard_with_qualifier()` or `fn wildcard(qualifier:
None)`? Though it's not used in our examples.
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