Package com.apple.foundationdb.record.query.plan.temp.explain

Interface InternalPlannerGraphRewritable

All Known Implementing Classes:

ExplodeExpression, LogicalIntersectionExpression, LogicalSortExpression, MatchableSortExpression, SelectExpression

public interface InternalPlannerGraphRewritable

Interface to allow RelationalExpressions to rewrite their own internal graph representation. Please see PlannerGraphRewritable for a more comprehensive explanation. This particular class allows RelationalExpressions to specify how a PlannerGraph is modified when we compute the PlannerGraphProperty for developers working on the query planner.

See Also:

for a more comprehensive explanation of graph rewriting.

Method Summary

Modifier and Type	Method	Description
PlannerGraph	rewriteInternalPlannerGraph(List<? extends PlannerGraph> childGraphs)	Method to rewrite the planner graph.

Method Detail

rewriteInternalPlannerGraph

@Nonnull
PlannerGraph rewriteInternalPlannerGraph(@Nonnull
                                         List<? extends PlannerGraph> childGraphs)

Method to rewrite the planner graph.

Parameters:

childGraphs - planner graphs of children expression that already have been computed

Returns:

a new planner graph that can combine the childGraphs in a meaningful way. Note that there is no obligation to use the childGraphs at all, this method can create a new independent planner graph completely from scratch.