aru-d-at commented on issue #852:
URL: https://github.com/apache/age/issues/852#issuecomment-1524225164

   Stepping through the code, it seems the Id is calculated through Postgres 
using the `stdlib-bsearch` library and calling function `bsearch()`.
   
   With the `ExecEvalStepOp` from 
_postgres/src/backend/executor/execExprInterp.c_ calling the function in 
multiple iterations to go through the existing Id's and evaluate the new Id's 
viability.
   
   The operation occurs similarly with the label_id's. Besides calling the 
previously mentioned function, it also calls the following (to name a few):
   * `_hash_any_` at _postgres/src/backend/utils/hashfn.c_
   * `_calc_bucket_` at _postgres/src/backend/utils/dynahash.c_


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