Convert a MAP to ARRAY with ENTRIES() · confluentinc/ksql#5452

(2 评论) (0 反应) (0 负责人)Java (5,739 star) (1,048 fork)batch import

enhancementhelp wanted

描述

I have data in the style of {"a":1, "b":{"b1": {"c":"aaa", "d":"bbb"}, "b2": {"c":"ccc", "d":"ddd"}}}

With schema defined as

a INT,
b MAP<STRING, STRUCT<
  c STRING,
  d STRING
>>

I would like to convert it to

a INT,
b ARRAY<STRUCT<
  c STRING,
  d STRING
>>

To look like this {"a":1, "b":[{"c":"aaa", "d":"bbb"},{"c":"ccc", "d":"ddd"}]}

Currently using ENTRIES() returns

Function 'ENTRIES' does not accept parameters (MAP<STRING, STRUCT<C STRING, D STRING>>).
Valid alternatives are:
ENTRIES(MAP<STRING, DOUBLE> map, BOOLEAN sorted)
ENTRIES(MAP<STRING, BOOLEAN> map, BOOLEAN sorted)
ENTRIES(MAP<STRING, VARCHAR> map, BOOLEAN sorted)
ENTRIES(MAP<STRING, BIGINT> map, BOOLEAN sorted)
ENTRIES(MAP<STRING, INT> map, BOOLEAN sorted)

Could ENTRIES() be extended to support this scenario?

贡献者指南

技术栈: javasql
领域: database
议题类型: feature
难度: 3
预计时间: 1-2 days
活动状态: stale
清晰度: clear
前置要求: Java programmingksql function developmentSQL data types
新手友好度: 40
研究方向: Start by examining the current implementation of the ENTRIES function in the ksql codebase, likely in the `ksql functions` module. Look for existing overloads that accept `MAP<STRING, DOUBLE>` etc. The error message shows the supported types. Extend by adding a new overload that accepts `MAP<STRING, STRUCT<...>>` and returns an array of structs. Check the comments on the issue for any additional context or guidance from maintainers.