Method parse_struct

datafusion/sql/src/expr/mod.rs:688–715

Parses a struct(..) expression and plans it creation

(
        &self,
        schema: &DFSchema,
        planner_context: &mut PlannerContext,
        values: Vec<SQLExpr>,
        fields: &[StructField],
    )

    /// Parses a struct(..) expression and plans it creation
    fn parse_struct(
        &self,
        schema: &DFSchema,
        planner_context: &mut PlannerContext,
        values: Vec<SQLExpr>,
        fields: &[StructField],
    ) -> Result<Expr> {
        if !fields.is_empty() {
            return not_impl_err!("Struct fields are not supported yet");
        }
        let is_named_struct = values
            .iter()
            .any(|value| matches!(value, SQLExpr::Named { .. }));

        let mut create_struct_args = if is_named_struct {
            self.create_named_struct_expr(values, schema, planner_context)?
        } else {
            self.create_struct_expr(values, schema, planner_context)?
        };

        for planner in self.context_provider.get_expr_planners() {
            match planner.plan_struct_literal(create_struct_args, is_named_struct)? {
                PlannerResult::Planned(expr) => return Ok(expr),
                PlannerResult::Original(args) => create_struct_args = args,
            }
        }
        not_impl_err!("Struct not supported by ExprPlanner: {create_struct_args:?}")
    }

    fn parse_tuple(
        &self,