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https://issues.apache.org/jira/browse/COMDEV-468?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chuxin Chen updated COMDEV-468:
-------------------------------
difficulty-level: (was: Easy)
> Apache ShardingSphere: Solve unsupported Postgres sql about statements that
> start with 'd', 'e', 'f', 'i' for ShardingSphere Parser
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Key: COMDEV-468
> URL: https://issues.apache.org/jira/browse/COMDEV-468
> Project: Community Development
> Issue Type: Improvement
> Components: GSoC/Mentoring ideas
> Reporter: Chuxin Chen
> Priority: Major
> Labels: Mentor, ShardingSphere, gsoc2022
>
> h2. Apache ShardingSphere
> Apache ShardingSphere is positioned as a Database Plus, and aims at building
> a standard layer and ecosystem above heterogeneous databases. It focuses on
> how to reuse existing databases and their respective upper layer, rather than
> creating a new database. The goal is to minimize or eliminate the challenges
> caused by underlying databases fragmentation.
> {*}Page{*}:
> [https://shardingsphere.apache.org|https://shardingsphere.apache.org/]
> {*}Github{*}: [https://github.com/apache/shardingsphere]
> h2. 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/]
>
> h2. Task
> This issue is to solve the unsupported postgres sql about alter in [this
> file|https://github.com/apache/shardingsphere/blob/master/shardingsphere-test/shardingsphere-parser-test/src/main/resources/sql/unsupported/unsupported.xml]
> . * CALL
> * DO
> * DROP FUNCTION
> * DROP INDEX
> * DROP INSTANCE RULE
> * DROP REWRITE RULE
> * EXECUTE
> * EXPLAIN
> * FETCH
> * FETCH ABSOLUTE
> * FETCH ALL
> * FETCH BACKWARD
> * FETCH FIRST
> * FETCH LAST
> * FETCH NEXT
> * FETCH PRIOR
> * FETCH RELATIVE
> * IMPORT FOREIGN SCHEMA
>
> You can *learn more*
> [here|https://www.postgresql.org/docs/current/sql-commands.html]. *
> You may need to try to get why it's not supported.(antlr4 grammar? or not
> implement visit method) You can use [antlr4
> plugins|https://plugins.jetbrains.com/plugin/7358-antlr-v4] to help you to
> analyze. You may need to visit [an official
> doc|https://www.postgresql.org/docs/current/sql-commands.html] to check the
> grammar.
> * After you fix it, remember to add a new corresponding SQL case in [SQL
> Cases|https://github.com/apache/shardingsphere/tree/master/shardingsphere-test/shardingsphere-parser-test/src/main/resources/sql/supported]
> and expected parsed result in [Expected Statment
> XML|https://github.com/apache/shardingsphere/tree/master/shardingsphere-test/shardingsphere-parser-test/src/main/resources/case].
> * Run
> [SQLParserParameterizedTest|https://github.com/apache/shardingsphere/blob/master/shardingsphere-test/shardingsphere-parser-test/src/main/java/org/apache/shardingsphere/test/sql/parser/parameterized/engine/SQLParserParameterizedTest.java]
> and
> [UnsupportedSQLParserParameterizedTest|https://github.com/apache/shardingsphere/blob/master/shardingsphere-test/shardingsphere-parser-test/src/main/java/org/apache/shardingsphere/test/sql/parser/parameterized/engine/UnsupportedSQLParserParameterizedTest.java]
> to make sure no exceptions.
>
> {*}Notice{*}, these issues can be a good example.
> [support alter foreign table for
> pg/og|https://github.com/apache/shardingsphere/pull/14944]
> [support alter materialized view for
> pg/og.|https://github.com/apache/shardingsphere/pull/15331]
> h2. Relevant Skills
>
> 1. Master JAVA language
> 2. Have a basic understanding of Antlr g4 file
> 3. Be familiar with Postgres SQLs
> h2. 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]
> h3. Mentor
> Chuxin Chen, Committer of Apache ShardingSphere, [email protected]
> Zhengqiang Duan, Committer of Apache ShardingSphere, [email protected]
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