The class manages both text and binary protocol prepared statement ID to
type mapping. The text protocol statements are mapped by their plaintext
name and the binary protocol statements are mapped by the session command
ID of the prepared statement.
By mapping the binary protocol prepared statement type to the session
command identifier, we can store the types for both styles of prepared
statements in a very similar manner. When the prepared statement handle is
received from the backend and is sent to the client, the client handle to
session command ID mapping can be done. This allows the mapping of both
client and backend PS handles to internal session command IDs.
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