vesoft-inc/nebula

DML(update) after pipeline

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#2,938 opened on Sep 27, 2021

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Description

Is your feature request related to a problem? Please describe.

  • To batch update tag after certain index scan.
  • To support update conditionally

Describe the solution you'd like Support this:

(root@nebula) [basketballplayer]> LOOKUP ON player | UPDATE VERTEX ON player $-.VertexID SET age = age + 0
[ERROR (-1004)]: SyntaxError: syntax error near `UPDATE'

Mon, 27 Sep 2021 10:23:58 CST

(root@nebula) [basketballplayer]> LOOKUP ON player WHERE player.name == "Tim Duncan" YIELD id(vertex) AS id | UPDATE VERTEX ON player $-.id SET age=1 YIELD age
[ERROR (-1004)]: SyntaxError: syntax error near `UPDATE'

Tue, 23 May 2023 14:03:33 CST

(root@nebula) [basketballplayer]> $var = YIELD "player999" AS vid;UPDATE VERTEX ON player $var.id SET age=1 YIELD age
[ERROR (-1004)]: SyntaxError: Variable is not supported in vid near `$var'

Describe alternatives you've considered Or so other expressions which make more sense than I wasn't aware of?

Additional context

https://discuss.nebula-graph.com.cn/t/topic/5911

Contributor guide

Research direction
Investigate the query parser and executor to understand how to chain LOOKUP and UPDATE operations; focus on the intermediate result passing mechanism.
Tech stack
cpp
Domain
database
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Over 1 week
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
GitC++
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30