Ecto.Adapters.SQL.Connection.prepare_execute

You're seeing just the callback prepare_execute, go back to Ecto.Adapters.SQL.Connection module for more information.
Link to this callback

prepare_execute(connection, name, statement, params, options)

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Specs

prepare_execute(
  connection(),
  name(),
  statement(),
  params(),
  options :: Keyword.t()
) :: {:ok, cached(), term()} | {:error, Exception.t()}

Prepares and executes the given query with DBConnection.