https://github.com/slaclab/lacquer

SQL Parser derived from Presto, written in Python with the PLY framework
https://github.com/slaclab/lacquer

presto presto-parser python sql sql-parser

Last synced: about 1 month ago
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SQL Parser derived from Presto, written in Python with the PLY framework

• Host: GitHub
• URL: https://github.com/slaclab/lacquer
• Owner: slaclab
• License: apache-2.0
• Created: 2017-01-12T18:36:43.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2017-08-18T03:12:54.000Z (over 7 years ago)
• Last Synced: 2024-11-11T01:42:28.311Z (2 months ago)
• Topics: presto, presto-parser, python, sql, sql-parser
• Language: Python
• Size: 241 KB
• Stars: 30
• Watchers: 12
• Forks: 18
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# lacquer [![Build Status](https://travis-ci.org/slaclab/lacquer.svg?branch=master)](https://travis-ci.org/slaclab/lacquer)

lacquer is a python port of Presto's SQL Parser.

Currently, it doesn't support all the same features as Presto's parser,

but it can parse most SELECT queries and produce the python-equivalent

syntax tree, as well as write the tree back out to SQL.

It was written for [LSST](http://lsst.org) to support the Astronomical 

Data Query Language, which is roughly equivalent to SQL-92.

## Advantages

* Only two dependencies, PLY and future. Runs on Python 2 and 3 (tested on 2.7 and 3.5).

* Uses the Presto AST IR and Visitor patterns

  * Code can easily be ported to lacquer from Python

## Known issues

**Only SELECT statements are currently supported.** This is mostly the case with

Presto as well.

In the porting, the grammar was ported from LL (ANTLRv4) to LALR (PLY).

There's a few shift/reduce errors, but most queries parse just fine, but you 

may run across a few errors, for example:

```sql

select 1 from foo where bar in ((select 1 from baz), 2)

```

### License

This work is licensed under Apache 2.0, the same as Presto.