taosdata/TDengine

does TDengine support stream processing on a specified subtable?

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#24,346 opened on Jan 5, 2024

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Description

CREATE STABLE IF NOT EXISTS point_data (
    time timestamp,
    val BINARY(64)
) TAGS  (point_id bigint);

CREATE STREAM stream1 
INTO point_data subtable('p10') 
as 
SELECT p1.time, p1.val+p2.val 
FROM p1, p2 WHERE p1.time=p2.time;

例如这样，想要实时计算两个子表的和，存在另一个子表里，tdengine支持吗？ 应该怎么写？ 现在的写法报错：DB error: Unsupported stream query

Contributor guide

Research direction
Investigate the error 'Unsupported stream query' in TDengine. Determine if stream queries can write to a specified subtable using the syntax shown. Check documentation for stream creation and write syntax. If not supported, consider proposing a feature request or alternative workaround like using a trigger or separate insertion after stream results.
Tech stack
csql
Domain
databasebackend
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
SQL
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60