vesoft-inc/nebula

feat: query to get all schema of the space

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#5,568 opened on May 31, 2023

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help wantedtype/feature req

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Description

This is needed in some cases i.e. support nebulagraph query in Langchain.

From the application layer, sometimes we could leverage meta-client to do so but it's not applicable for all cases.

Possible options:

  • introduce a query to show all schemas in one go
  • support variable/pipeline on desc query like:
(root@nebula) [basketballplayer]> show edges AS e| desc edge $-.e
[ERROR (-1004)]: SyntaxError: syntax error near `AS'

Wed, 31 May 2023 15:27:30 CST

Contributor guide

Research direction
Investigate the NebulaGraph query parser and execution engine to add a new 'SHOW ALL SCHEMAS' query or extend the DESC query to support pipeline operations like 'SHOW EDGES | DESC $ .e'. Look at existing implementations of SHOW statements and the pipeline syntax in the codebase.
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.
3
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.
Stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
Graph database conceptsQuery language design
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40