Description

This PR implements support for the IF EXISTS clause in TRUNCATE TABLE statements, addressing issue #5763.

Changes

• ✅ Added parsing for TRUNCATE TABLE IF EXISTS table_name syntax
• ✅ Implemented graceful handling of non-existent tables when IF EXISTS is used
• ✅ Maintained full backward compatibility with existing TRUNCATE TABLE functionality
• ✅ Added comprehensive test coverage

Examples

-- New syntax that succeeds silently if table doesn't exist
TRUNCATE TABLE IF EXISTS my_table;

-- Works with multiple tables
TRUNCATE TABLE IF EXISTS table1, table2, table3;

-- Compatible with all existing options
TRUNCATE TABLE IF EXISTS my_table KEEP SYMBOL MAPS;

Note

CI/CD pipeline shows infrastructure errors unrelated to this change:

• Rust test failures (this is a Java-only change)
• Missing log files (build system issue)
• Artifact publishing problems (infrastructure issue)

Local testing shows all functionality works correctly.