risingwave_frontend::optimizer::rule::stream

Module bushy_tree_join_ordering_rule

Source

Structs§

BushyTreeJoinOrderingRule
Reorders a multi join into a bushy tree shape join tree with a minimal height.

Constants§

BUSHY_TREE_JOIN_LOWER_LIMIT 🔒
To construct a bushy tree with a height lower than the left deep tree, we need tt least four inputs.
BUSHY_TREE_JOIN_UPPER_LIMIT 🔒
If inputs of a multi join reach the limit, fallback to a left deep tree, because the search space could be too large to search.