Commits on Nov 6, 2024

1. [Opt](TabletSchema) reuse TabletColumn info to reduce mem (apache#42448) …

   1. When there are a large number of identical TabletColumns in the
   cluster, which usually occurs when VARIANT type columns are modified and
   added, each Rowset has an individual TabletSchema. Excessive
   TabletSchemas can lead to significant memory overhead. Reusing memory
   for identical TabletColumns would greatly reduce this memory
   consumption.
   2. Serialized TabletSchema as LRU cache key could also increase memusage
   when large sets of schemas are in LRU cache, so inorder to reduce the
   memory footprint we just record the key signature caculated by
   generating an UUID by hash algorithm， and lookup the key signature in
   LRU cache， and check the key in case of hash collision

   

   eldenmoon committed Nov 6, 2024
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