feat: add Apache Doris parser with official grammar (#43)

* docs: add design for separating StarRocks and Doris parsers

Document the plan to rename existing doris/ to starrocks/ and create
a new doris/ directory using the official Apache Doris grammar.

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Co-Authored-By: Claude <[email protected]>

* docs: add implementation plan for StarRocks/Doris separation

Detailed step-by-step plan covering:
- Renaming existing doris/ to starrocks/
- Creating new doris/ with Apache Doris grammar
- Adding test examples from Doris documentation
- Updating CI workflow

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Co-Authored-By: Claude <[email protected]>

* refactor: rename doris parser to starrocks

The existing doris/ directory actually contains StarRocks SQL grammar.
Rename to accurately reflect the parser source.

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Co-Authored-By: Claude <[email protected]>

* feat: add Apache Doris parser with official grammar

Add new doris/ directory using the official Apache Doris grammar from:
https://github.com/apache/doris/tree/master/fe/fe-core/src/main/antlr4/org/apache/doris/nereids

Modified grammar files to be compatible with ANTLR Go target:
- Removed Java @members sections from DorisLexer.g4 and DorisParser.g4
- Removed Java predicates (isValidDecimal, isNoBackslashEscapes, ansiSQLSyntax)
- Simplified lexer rules for STRING_LITERAL, DECIMAL_VALUE, EXPONENT_VALUE, and BIGDECIMAL_LITERAL
- Made queryOrganization optional in querySpecification rule

Includes test examples from Doris documentation for:
- SELECT statements
- INSERT statements
- CREATE TABLE statements

All tests passing.

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Co-Authored-By: Claude <[email protected]>

* ci: add starrocks parser to test matrix

* test(doris): add comprehensive SQL examples from Doris documentation

Add 17 SQL test files covering all major statement categories:
- Data Query: SELECT statements
- DML: INSERT, INSERT OVERWRITE, UPDATE, DELETE
- DDL: CREATE/ALTER/DROP TABLE, DATABASE, VIEW, INDEX
- Account Management: CREATE USER
- Transaction: BEGIN, COMMIT
- Materialized Views
- SHOW statements

Each file corresponds to one documentation page from:
https://doris.apache.org/docs/3.x/sql-manual/sql-statements/

Total: 153 SQL statements across 17 test files

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Co-Authored-By: Claude <[email protected]>

* test(doris): add session and account management SQL examples

Add 4 new test files:
- session_variable.sql: SET/SHOW variable statements
- session_context.sql: USE DATABASE, SWITCH CATALOG
- account_grant.sql: GRANT privilege statements
- account_revoke.sql: REVOKE privilege statements

Total: 21 test files, 185 SQL statements

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Co-Authored-By: Claude <[email protected]>

* test(doris): expand SQL test coverage with additional examples

Add 29 new SQL test files and update existing ones to provide comprehensive
test coverage across multiple Doris SQL feature categories:

- Account management: alter user, drop user, roles, set password, show grants
- Catalog operations: alter, create, drop, show catalogs
- Cluster management: backend, broker, frontend, resource, storage, workload
- Table operations: alter table (property, rename, replace, rollup)
- Index operations: create, drop, build index
- Async materialized views
- Functions and plugins
- Statistics, recovery, and security

Total test files: 50 (up from 21)

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Co-Authored-By: Claude <[email protected]>

* test(doris): add regression test folder for user scripts

- Create examples/regression/ folder for user-reported SQL scripts
- Update parser_test.go to recursively test subdirectories
- Add first regression test: SHOW CREATE ROUTINE LOAD FOR

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Co-Authored-By: Claude <[email protected]>

* refactor(doris): use recursive directory walking for tests

Use filepath.WalkDir to recursively find all .sql test files in the
examples directory, allowing for arbitrarily nested subdirectories.

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Co-Authored-By: Claude <[email protected]>

* chore: update

* chore: remove implementation plan docs

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Co-Authored-By: Claude <[email protected]>

---------

Co-authored-by: Claude <[email protected]>

Author: h3n4l

.github/workflows/tests.yml

@@ -34,7 +34,7 @@ jobs:
         id: set-matrix
         run: |
           # List of all available parsers
-          ALL_PARSERS="redshift postgresql cql snowflake tsql doris trino plsql googlesql mysql partiql tidb mariadb cosmosdb"
+          ALL_PARSERS="redshift postgresql cql snowflake tsql doris starrocks trino plsql googlesql mysql partiql tidb mariadb cosmosdb"
           # Add more parsers here as they are added to the repository
           # ALL_PARSERS="redshift mysql postgresql"