ShashidharM0118 opened a new pull request, #19401:
URL: https://github.com/apache/datafusion/pull/19401

   ## Which issue does this PR close?
   
   Closes #19396.
   
   ## Rationale for this change
   
   Previously, when a `DefaultListFilesCache` was created with a TTL (e.g., 
`DefaultListFilesCache::new(1024, Some(Duration::from_secs(1)))`) and passed to 
`CacheManagerConfig` without explicitly setting `list_files_cache_ttl`, the 
cache's TTL would be unexpectedly unset (overwritten to `None`).
   
   This happened because `CacheManager::try_new()` always called 
`update_cache_ttl(config.list_files_cache_ttl)`, even when the config value was 
`None`. 
   
   ## What changes are included in this PR?
   
   - Modified `CacheManager::try_new()` to only update the cache's TTL if 
`config.list_files_cache_ttl` is explicitly set (`Some(value)`). If the config 
TTL is `None`, the cache's existing TTL is preserved.
   - Added two test cases:
     - `test_ttl_preserved_when_not_set_in_config`: Verifies that TTL is 
preserved when not set in config
     - `test_ttl_overridden_when_set_in_config`: Verifies that TTL can still be 
overridden when explicitly set in config
   
   ## Are these changes tested?
   
   Yes
   
   ## Are there any user-facing changes?
   
   Yes


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