mingmwang commented on code in PR #4490:
URL: https://github.com/apache/arrow-datafusion/pull/4490#discussion_r1043122807
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datafusion/expr/src/logical_plan/plan.rs:
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@@ -1360,6 +1370,18 @@ pub struct CreateExternalTable {
pub options: HashMap<String, String>,
}
+/// Prepare a statement but do not execute it. Prepare statements can have 0
or more
+/// `Expr::Placeholder` expressions that are filled in during execution
+#[derive(Clone)]
+pub struct Prepare {
+ /// The name of the statement
+ pub name: String,
+ /// Data types of the parameters ([`Expr::Placeholder`])
+ pub data_types: Vec<DataType>,
+ /// The logical plan of the statements
+ pub input: Arc<LogicalPlan>,
+}
+
Review Comment:
I assume the data types Vec size is the same with the place holders in the
input plan, but is there any check for this?
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