should be it

external/duckdb/tools/swift/duckdb-swift/Sources/DuckDB/CodingUserInfoKeys.swift

@@ -0,0 +1,52 @@
+//
+//  DuckDB
+//  https://github.com/duckdb/duckdb-swift
+//
+//  Copyright © 2018-2024 Stichting DuckDB Foundation
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to
+//  deal in the Software without restriction, including without limitation the
+//  rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+//  sell copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+//  IN THE SOFTWARE.
+
+public struct CodingUserInfoKeys {
+  /// This key is set on the `userInfo` dictionary of the `Decoder` that is
+  /// used when transforming data into a `Decodable`. The value is the ``LogicalType``
+  /// of the element being decoded. This can be used to implement dynamic decoding
+  /// behavior based on the underlying database type.
+  ///
+  /// For example:
+  /// ```swift
+  ///  struct DynamicDecodable: Decodable {
+  ///   init(from decoder: Decoder) throws {
+  ///      guard let logicalType = decoder.userInfo[CodingUserInfoKeys.logicalType] as? LogicalType else {
+  ///       throw Error.expectedLogicalType
+  ///      }
+  ///      switch logicalType.dataType {
+  ///        case .list:
+  ///          let unkeyedContainer = try decoder.unkeyedContainer()
+  ///          ...
+  ///        case .map, .struct:
+  ///          let keyedContainer = try decoder.container(keyedBy: AnyCodingKey.self)
+  ///          ...
+  ///      }
+  ///    }
+  ///  }
+  ///
+  ///  let column = result[0].cast(to: DynamicDecodable.self)
+  ///  ```
+  public static let logicalTypeCodingUserInfoKey = CodingUserInfoKey(rawValue: "logicalType")!
+}