@API(since="1.24", status=INTERNAL) public interface RelDigest
The digest is the exact representation of the corresponding
RelNode, at anytime, anywhere. The only difference is that digest is compared using
#hashCode, which are prohibited to override for RelNode, for legacy reasons.
INTERNAL USE ONLY.
clearvoid clear()Reset state, possibly cache of hash code.
getRelRelNode getRel()Returns the relnode that this digest is associated with.