Method _clone

lib/sqlalchemy/sql/elements.py:2143–2158

(self, maintain_key: bool = False, **kw: Any)

        return c

    def _clone(self, maintain_key: bool = False, **kw: Any) -> Self:
        c = ClauseElement._clone(self, **kw)
        # ensure all the BindParameter objects stay in cloned set.
        # in #7823, we changed "clone" so that a clone only keeps a reference
        # to the "original" element, since for column correspondence, that's
        # all we need.   However, for BindParam, _cloned_set is used by
        # the "cache key bind match" lookup, which means if any of those
        # interim BindParameter objects became part of a cache key in the
        # cache, we need it.  So here, make sure all clones keep carrying
        # forward.
        c._cloned_set.update(self._cloned_set)
        if not maintain_key and self.unique:
            c.key = _anonymous_label.safe_construct(
                id(c), c._orig_key or "param", sanitize_key=True
            )
        return c

    def _gen_cache_key(self, anon_map, bindparams):
        _gen_cache_ok = self.__class__.__dict__.get("inherit_cache", False)