delta-io/delta

[Kernel][Defaults] Support `COALESCE` for all data types in the `DefaultExpressionHandler`

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#2,416 建立於 2023年12月28日

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 (2 留言) (0 反應) (0 負責人)Scala (8,807 star) (2,100 fork)batch import
enhancementgood first issuekernel

描述

Feature request

Which Delta project/connector is this regarding?

  • Spark
  • Standalone
  • Flink
  • Kernel
  • Other (fill in here)

Overview

#2415 adds support for COALESCE for boolean type expressions. We should support all data types.

Further details

#2415 already adds the needed changes. To support more data types we just need to add tests and remove the check that allows only boolean type in DefaultExpressionEvaluator.

貢獻者指南

技術棧
scala
領域
database
議題類型
feature
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。
half day
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
Familiarity with Delta KernelUnderstanding of PR #2415
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。
70
研究方向
Examine the changes in PR #2415 that added COALESCE support for boolean types. Identify the check in DefaultExpressionEvaluator that restricts COALESCE to boolean types. Add tests for other data types (e.g., integer, string) and remove the boolean only check. Refer to the existing test patterns in the Kernel module.