taosdata/TDengine

can't change table schema after subscribing to a column

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#23,483 opened on Oct 31, 2023

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Description

目前我们的需求是，需要订阅超级表的全部数据变更，但不能影响表结构的改变且变更数据需要包含tag数据及子表信息。但当前数据订阅使用过程中，遇到按列方式订阅后，无法修改表结构，即不可以删除已经订阅的列且新增加了列，该列数据也不会被订阅到；换成订阅超级表后，超级表又没有tag信息及子表信息；极大的限制了可用性。不知道有没有后续计划支持。

Contributor guide

Research direction
Investigate the subscription mechanism in TDengine that locks schema changes after column subscription. Look for relevant code in the subscription module and schema alteration functions.
Tech stack
c
Domain
database
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
database conceptsSQL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30