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Previously, mmap settings configured at the collection or field level were not being applied during segment loading in segcore. This was caused by: 1. A typo in the key name: "mmap.enable" instead of "mmap.enabled" 2. Missing logic to parse and apply mmap settings from schema This commit fixes the issue by: - Correcting the key name to "mmap.enabled" to match the standard - Adding Schema::MmapEnabled() method to retrieve field/collection level mmap settings with proper fallback logic - Parsing mmap settings from field type_params and collection properties during schema parsing - Applying computed mmap settings in LoadColumnGroup() and Load() methods instead of hardcoded false values - Using global MmapConfig as fallback when no explicit setting exists The mmap setting priority is now: 1. Field-level mmap setting (from type_params) 2. Collection-level mmap setting (from properties) 3. Global mmap config (from MmapManager) For column groups, if any field has mmap enabled, the entire group uses mmap (since they are loaded together). Related issue: #45060 Signed-off-by: Congqi Xia <congqi.xia@zilliz.com>