apache/iceberg

Docs: Clarify Spark branch write precedence over WAP branch

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#15,916 建立於 2026年4月9日

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 (1 留言) (0 反應) (0 負責人)Java (5,146 star) (1,915 fork)batch import
docsgood first issueimprovement

描述

Feature Request / Improvement

After https://github.com/apache/iceberg/pull/15288, Spark Writing to Branches doc (docs/docs/spark-writes.md) no longer matches that in codes.

   * <p>The target branch can be specified via table identifier, write option, or in SQL:
   *
   * <ul>
   *   <li>The identifier and option branches can't conflict. If both are set, they must match.
   *   <li>Identifier and option branches take priority over the session WAP branch.
   *   <li>If neither the option nor the identifier branch is set and WAP is enabled for this table,
   *       use the WAP branch from the session SQL config.
   * </ul>
   *
   * <p>Note: WAP ID and WAP branch cannot be set at the same time.
   *
   * <p>Note: The target branch may be created during the write operation if it does not exist.

Query engine

Spark

Willingness to contribute

  • I can contribute this improvement/feature independently
  • I would be willing to contribute this improvement/feature with guidance from the Iceberg community
  • I cannot contribute this improvement/feature at this time

貢獻者指南

技術棧
java
領域
documentation
議題類型
documentation
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
2
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Review linked PR #15288 for contextUnderstand current branch precedence logic
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
80
研究方向
Start by reading the current documentation at docs/docs/spark writes.md and compare it with the code comments, especially those updated in PR #15288. The key point is that identifier and option branches take priority over the WAP branch. Identify where the documentation diverges and rewrite the relevant section to match the code. Ensure the updated doc explains the precedence clearly and concisely.