[core][flink] Support view operations in JDBC Catalog

[tchivs]

Purpose

Add view support for JDBC Catalog to enable CREATE VIEW, DROP VIEW, SHOW VIEWS and other view operations.

Changes

• Add view method delegation to CachingCatalog for proper wrapping
• Implement view operations in JdbcCatalog (createView, getView, listViews, dropView, renameView, alterView)
• Add view-related SQL utilities in JdbcUtils
• Add integration tests in JdbcCatalogViewITCase
• Add SQLite JDBC dependency for tests

Tests

All 7 integration tests pass:

• testCreateAndQueryView
• testShowViews
• testDropView
• testViewWithAggregation
• testCreateViewIfNotExists
• testDropViewIfExists
• testShowCreateView

[github-actions]

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[JingsongLi]

Nice feature adding view support to JDBC Catalog (+716 lines). Review:

1. Completeness: Implements all view operations (create, get, list, drop, rename, alter) - this is a complete feature.

2. CachingCatalog delegation: Adding view method delegation ensures views work correctly when the catalog is wrapped. Good.

3. JdbcUtils SQL: The view metadata is stored in JDBC tables alongside table metadata. Key questions:

   • What's the schema for the view storage table? Is it created automatically (schema migration)?
   • Is the view SQL text stored as-is, or is there any parsing/validation?
   • How are cross-database view references handled?

4. Testing: 7 integration tests is good coverage for the basic operations. Consider adding:

   • View referencing a non-existent table (should this fail at create time or query time?)
   • Rename view across databases
   • Concurrent view creation

5. Flink integration test: Good that there's a dedicated JdbcCatalogViewITCase testing end-to-end with Flink SQL.

6. SQLite test dependency: Reasonable for unit tests, but ensure it doesn't leak into production classpath.

Looks well-structured. Would be good to confirm the DDL for the views table in the JDBC schema.