Method create_named_struct_expr

datafusion/sql/src/expr/mod.rs:812–848

Handles a call to struct(...) where the arguments are named. For example `struct (v as foo, v2 as bar)` by creating a call to the `named_struct` function

(
        &self,
        values: Vec<SQLExpr>,
        input_schema: &DFSchema,
        planner_context: &mut PlannerContext,
    )

    // Handles a call to struct(...) where the arguments are named. For example
    // `struct (v as foo, v2 as bar)` by creating a call to the `named_struct` function
    fn create_named_struct_expr(
        &self,
        values: Vec<SQLExpr>,
        input_schema: &DFSchema,
        planner_context: &mut PlannerContext,
    ) -> Result<Vec<Expr>> {
        Ok(values
            .into_iter()
            .enumerate()
            .map(|(i, value)| {
                let args = if let SQLExpr::Named { expr, name } = value {
                    [
                        name.value.lit(),
                        self.sql_expr_to_logical_expr(
                            *expr,
                            input_schema,
                            planner_context,
                        )?,
                    ]
                } else {
                    [
                        format!("c{i}").lit(),
                        self.sql_expr_to_logical_expr(
                            value,
                            input_schema,
                            planner_context,
                        )?,
                    ]
                };

                Ok(args)
            })
            .collect::<Result<Vec<_>>>()?
            .into_iter()
            .flatten()
            .collect())
    }

    // Handles a call to struct(...) where the arguments are not named. For example
    // `struct (v, v2)` by creating a call to the `struct` function