Function decode_sst_meta 

pub(crate) async fn decode_sst_meta(
    file_path: &str,
    parquet_metadata: ParquetMetaData,
    region_metadata: Option<RegionMetadataRef>,
    page_index_policy: PageIndexPolicy,
) -> Result<Arc<CachedSstMeta>>

Decodes SST metadata without preparing a compact cache entry.