Examples of com.facebook.presto.sql.planner.EqualityInference.generateEqualitiesPartitionedBy()

com.facebook.presto.sql.planner.EqualityInference.generateEqualitiesPartitionedBy()

Dumps the inference equalities as equality expressions that are partitioned by the symbolScope. All stored equalities are returned in a compact set and will be classified into three groups as determined by the symbol scope:

equalities that fit entirely within the symbol scope
equalities that fit entirely outside of the symbol scope
equalities that straddle the symbol scope

 Example: Stored Equalities: a = b = c d = e = f = g Symbol Scope: a, b, d, e Output EqualityPartition: Scope Equalities: a = b d = e Complement Scope Equalities f = g Scope Straddling Equalities a = c d = f

                    postAggregationConjuncts.add(conjunct);
                }
            }


            // Add the equality predicates back in
            EqualityInference.EqualityPartition equalityPartition = equalityInference.generateEqualitiesPartitionedBy(in(node.getGroupBy()));
            pushdownConjuncts.addAll(equalityPartition.getScopeEqualities());
            postAggregationConjuncts.addAll(equalityPartition.getScopeComplementEqualities());
            postAggregationConjuncts.addAll(equalityPartition.getScopeStraddlingEqualities());


            PlanNode rewrittenSource = planRewriter.rewrite(node.getSource(), combineConjuncts(pushdownConjuncts));

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