mchades opened a new pull request, #9566:
URL: https://github.com/apache/gravitino/pull/9566
### What changes were proposed in this pull request?
This PR implements the server-side REST API for User-Defined Functions
(UDFs), including:
- **DTO classes**: `FunctionDTO`, `FunctionDefinitionDTO`,
`FunctionParamDTO`, `FunctionColumnDTO`, `FunctionImplDTO` (with `JavaImplDTO`,
`PythonImplDTO`, `SQLImplDTO` subclasses), `FunctionResourcesDTO`
- **Request/Response classes**: `FunctionRegisterRequest`,
`FunctionUpdateRequest`, `FunctionUpdatesRequest`, `FunctionResponse`
- **REST endpoint**: `FunctionOperations` with register, get (with optional
version), update, and delete operations
- **Exception handlers**: Added function-related exception handlers
- **Utility methods**: Added namespace and identifier validation for
functions
### Why are the changes needed?
To provide server-side REST API support for managing UDFs in Gravitino.
Fix: #9529
### Does this PR introduce _any_ user-facing change?
Yes, this PR adds new REST API endpoints for UDF management:
- `POST /metalakes/{metalake}/catalogs/{catalog}/schemas/{schema}/functions`
- Register a function
- `GET
/metalakes/{metalake}/catalogs/{catalog}/schemas/{schema}/functions/{function}`
- Get a function (with optional version query param)
- `PUT
/metalakes/{metalake}/catalogs/{catalog}/schemas/{schema}/functions/{function}`
- Update a function
- `DELETE
/metalakes/{metalake}/catalogs/{catalog}/schemas/{schema}/functions/{function}`
- Delete a function
### How was this patch tested?
- Added comprehensive unit tests for all DTO classes (`TestFunctionDTO`)
- Added comprehensive unit tests for REST endpoint (`TestFunctionOperations`)
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