NGA-TRAN commented on code in PR #4490:
URL: https://github.com/apache/arrow-datafusion/pull/4490#discussion_r1042198569
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datafusion/expr/src/expr.rs:
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@@ -244,6 +244,8 @@ pub enum Expr {
/// List of grouping set expressions. Only valid in the context of an
aggregate
/// GROUP BY expression list
GroupingSet(GroupingSet),
+ /// A place holder for parameters in a prepared statement.
+ Placeholder(String),
Review Comment:
I think this is a good idea. This way, we won't miss to get data type of any
params
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