Zhengqiang Duan created COMDEV-441:
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Summary: Apache ShardingSphere: Solve unsupported Postgres sql
about alter statement for ShardingSphere Parser
Key: COMDEV-441
URL: https://issues.apache.org/jira/browse/COMDEV-441
Project: Community Development
Issue Type: Improvement
Components: GSoC/Mentoring ideas
Reporter: Zhengqiang Duan
Apache ShardingSphere
Apache ShardingSphere is a distributed database middleware ecosystem, including
2 independent products, ShardingSphere JDBC and ShardingSphere Proxy presently.
They all provide functions of data sharding, distributed transaction, and
database orchestration.
Page: https://shardingsphere.apache.org
Github: https://github.com/apache/shardingsphere
Background
ShardingSphere parser engine helps users parse a SQL to get the AST (Abstract
Syntax Tree) and visit this tree to get SQLStatement (Java Object). At present,
this parser engine can handle SQLs for `MySQL`, `PostgreSQL`, `SQLServer`,
`openGauss` and `Oracle`, which means we have to understand different database
dialect SQLs.
More details:
https://shardingsphere.apache.org/document/current/en/reference/sharding/parse/
Task
This issue is to solve the unsupported postgres sql about alter in this file .
- ALTER OPERATOR
- ALTER POLICY
- ALTER PUBLICATION
- ALTER ROUTINE
- ALTER RULE
- ALTER SCHEMA
- ALTER SEQUENCE
- ALTER SERVER
- ALTER STATISTICS
- ALTER SUBSCRIPTION
- ALTER TABLE
- ALTER TEXT SEARCH
- ALTER TRIGGER
- ALTER TYPE
- ALTER VIEW
You can learn more here.
- You may need to try to get why it's not supported.(antlr4 grammar? or not
implement visit method) You can use antlr4 plugins to help you to analyze. You
may need to visit an official doc to check the grammar.
- After you fix it, remember to add a new corresponding SQL case in SQL Cases
and expected parsed result in Expected Statment XML.
- Run SQLParserParameterizedTest and UnsupportedSQLParserParameterizedTest to
make sure no exceptions.
Notice, these issues can be a good example.
support alter foreign table for pg/og
support alter materialized view for pg/og.
Relevant Skills
1. Master JAVA language
2. Have a basic understanding of Antlr g4 file
3. Be familiar with Postgres SQLs
Targets files
1. Postgres SQLs g4 file:
https://github.com/apache/shardingsphere/blob/master/shardingsphere-sql-parser/shardingsphere-sql-parser-dialect/shardingsphere-sql-parser-postgresql/src/main/antlr4/org/apache/shardingsphere/sql/parser/autogen/PostgreSQLStatement.g4
Mentor
Zhengqiang Duan, Committer of Apache ShardingSphere, duanzhengqi...@apache.org
Haoran Meng, PMC of Apache ShardingSphere, menghao...@apache.org
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