avantgardnerio commented on code in PR #4701:
URL: https://github.com/apache/arrow-datafusion/pull/4701#discussion_r1054714984
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datafusion/expr/src/expr.rs:
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@@ -218,7 +218,7 @@ pub enum Expr {
/// The identifier of the parameter (e.g, $1 or $foo)
id: String,
/// The type the parameter will be filled in with
- data_type: DataType,
+ data_type: Option<DataType>,
Review Comment:
Make the data type optional, since we might not know it during initial
conversion from SQL ast.
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