Add a Presto dialect

未关闭
#2,611 0 条评论 0 个 reaction 已指派 0 人 在 GitHub 查看

维护者通常 1 天内回复

还没有人认领这个 Issue。

评估

难度
4/5
预计耗时
3-5 天
新手友好度
55/100
Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
rust, sql

调研方向

Start by reading the existing dialect implementations and the Dialect flags for FILTER, grouping sets, and lambdas; compare identifier rules with Presto's linked SqlBase.g4 grammar. Then locate how the lexer handles identifier characters and quote delimiters. Done means a PrestoDialect supports the proposed identifier rules and shared syntax; time travel and CREATE FUNCTION are explicitly out of scope.

由索引模型根据 Issue 内容生成。

描述

BigQuery Hive MySQL

Presto is a distributed SQL query engine created at Facebook in 2012 and governed since 2019 by the Presto Foundation under the Linux Foundation, with members including Uber, Alibaba and IBM (which ships it in watsonx.data).

Differences in Presto's grammar (SqlBase.g4) from the existing dialects:

  • Unquoted identifiers may contain @ and : after the first character, so events:analytics is a single identifier. No existing dialect lexes this. (#2604 covers dialects that need such names split into parts.)
  • Only double quotes delimit identifiers. Backquotes, which MySQL, Hive and BigQuery accept, are rejected.
  • Time travel accepts FOR {SYSTEM_TIME | SYSTEM_VERSION | TIMESTAMP | VERSION} {AS OF | BEFORE} expr. Today the parser models only FOR SYSTEM_TIME AS OF from this family.

Proposal: a PrestoDialect with these identifier rules, plus the existing Dialect flags for syntax Presto shares with other engines (FILTER (WHERE ...), GROUPING SETS/CUBE/ROLLUP, lambdas). Time travel and CREATE FUNCTION need AST changes and can follow separately.

主要语言
Rust
星标
3.5k
派生
805
平均合并
2 天 3 小时
30 天内合并 PR
116

环境准备

  • 没有 Dockerfile 或 Docker Compose 文件
  • 有 Pull Request 模板
  • 没有贡献指南

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

apache/datafusion-sqlparser-rs 的其他 Issue

查看 apache/datafusion-sqlparser-rs 的全部 Issue

相似的 Issue

更多 Rust Issue

把新 issue 发到你的邮箱

精选适合新手参与的 GitHub issue 摘要。