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Fixes: #1327
Commit 5b14653 (#1245) switched the introspection query in
copy_records_to_table()from_prepare(..., use_cache=True)toprepare(), which never uses the statement cache. As a result everycall re-prepares
SELECT ... LIMIT 1, adding a network round-trip perCOPY and a ~20% slowdown with non-trivial latency.
Restore the cache lookup. Named statements are still not used when
the statement cache is disabled, since
_prepare()derives the namefrom
_stmt_cache_enabled.