[GitHub] [incubator-doris] zhengshiJ commented on a change in pull request #7357: [feature] (planner) InferPredicate (#7096)

[GitBox <gi...@apache.org>]

zhengshiJ commented on a change in pull request #7357:
URL: https://github.com/apache/incubator-doris/pull/7357#discussion_r767485846



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File path: fe/fe-core/src/main/java/org/apache/doris/rewrite/InferFiltersRule.java
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@@ -0,0 +1,302 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.apache.doris.rewrite;
+
+import org.apache.doris.analysis.Analyzer;
+import org.apache.doris.analysis.BinaryPredicate;
+import org.apache.doris.analysis.CompoundPredicate;
+import org.apache.doris.analysis.Expr;
+import org.apache.doris.analysis.IsNullPredicate;
+import org.apache.doris.analysis.JoinOperator;
+import org.apache.doris.analysis.LiteralExpr;
+import org.apache.doris.analysis.SlotRef;
+import org.apache.doris.common.AnalysisException;
+import org.apache.doris.common.Pair;
+
+import com.google.common.collect.Sets;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+
+import java.util.ArrayList;
+import java.util.Set;
+
+/**
+ * The function of this rule is to derive a new predicate based on the current predicate.
+ * eg.
+ * t1.id = t2.id and t2.id = t3.id and t3.id = 100;
+ * -->
+ * t1.id = 100 and t2.id = 100 and t3.id = 100;
+ *
+ * 1. Register a new rule InferFiltersRule and add it to GlobalState.
+ * 2. Traverse Conjunct to construct on/where equivalence connection, numerical connection and isNullPredicate.
+ * 3. Use Warshall to infer all equivalence connections
+ * 4. Construct additional numerical connections and isNullPredicate
+ */
+public class InferFiltersRule implements ExprRewriteRule {
+    private final static Logger LOG = LogManager.getLogger(InferFiltersRule.class);
+    public static InferFiltersRule INSTANCE = new InferFiltersRule();
+
+    @Override
+    public Expr apply(Expr expr, Analyzer analyzer) throws AnalysisException {
+        if (expr == null) {
+            return null;
+        } else if (!analyzer.enableInferPredicate()) {
+            return expr;
+        } else {
+            ArrayList<Expr> slotEqSlotPredicatesList = new ArrayList<>();
+            Set<Pair<Expr, Expr>> slotEqSlotPredicatesSet = Sets.newHashSet();
+            ArrayList<Expr> slotToLiteralPredicatesList = new ArrayList<>();
+            Set<Pair<Expr, Expr>> slotToLiteralPredicatesSet = Sets.newHashSet();
+            ArrayList<Expr> newPredicatesList = new ArrayList<>();
+            ArrayList<Expr> isNullPredicatesList = new ArrayList<>();
+            Set<Expr> isNullPredicatesSet = Sets.newHashSet();
+
+            initAllStructure(expr, slotEqSlotPredicatesList, slotEqSlotPredicatesSet,
+                    slotToLiteralPredicatesList, slotToLiteralPredicatesSet,
+                    isNullPredicatesList, isNullPredicatesSet);
+
+            inferSlotPredicates(slotEqSlotPredicatesList, slotToLiteralPredicatesSet,
+                    slotToLiteralPredicatesList, newPredicatesList, analyzer);
+
+            inferIsNullPredicates(slotEqSlotPredicatesList, isNullPredicatesList,
+                    isNullPredicatesSet, newPredicatesList, analyzer);
+            
+            if (!newPredicatesList.isEmpty()) {
+                Expr rewriteExpr = new CompoundPredicate(CompoundPredicate.Operator.AND, expr, newPredicatesList.get(0));

Review comment:
       done




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