[fix](Planner): don't push down isNull predicate into view (#26288)

We can't push down `isNull` predicate into view

fe/fe-core/src/main/java/org/apache/doris/analysis/BinaryPredicate.java

@@ -799,8 +799,8 @@ public class BinaryPredicate extends Predicate implements Writable {
     }
 
     @Override
-    public Expr getResultValue(boolean inView) throws AnalysisException {
-        recursiveResetChildrenResult(inView);
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
+        recursiveResetChildrenResult(forPushDownPredicatesToView);
         final Expr leftChildValue = getChild(0);
         final Expr rightChildValue = getChild(1);
         if (!(leftChildValue instanceof LiteralExpr)

fe/fe-core/src/main/java/org/apache/doris/analysis/CastExpr.java

@@ -399,8 +399,8 @@ public class CastExpr extends Expr {
     }
 
     @Override
-    public Expr getResultValue(boolean inView) throws AnalysisException {
-        recursiveResetChildrenResult(inView);
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
+        recursiveResetChildrenResult(forPushDownPredicatesToView);
         final Expr value = children.get(0);
         if (!(value instanceof LiteralExpr)) {
             return this;

fe/fe-core/src/main/java/org/apache/doris/analysis/CompoundPredicate.java

@@ -230,8 +230,8 @@ public class CompoundPredicate extends Predicate {
     }
 
     @Override
-    public Expr getResultValue(boolean inView) throws AnalysisException {
-        recursiveResetChildrenResult(inView);
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
+        recursiveResetChildrenResult(forPushDownPredicatesToView);
         boolean compoundResult = false;
         if (op == Operator.NOT) {
             final Expr childValue = getChild(0);

fe/fe-core/src/main/java/org/apache/doris/analysis/Expr.java

@@ -2190,10 +2190,10 @@ public abstract class Expr extends TreeNode<Expr> implements ParseNode, Cloneabl
     }
 
 
-    protected void recursiveResetChildrenResult(boolean inView) throws AnalysisException {
+    protected void recursiveResetChildrenResult(boolean forPushDownPredicatesToView) throws AnalysisException {
         for (int i = 0; i < children.size(); i++) {
             final Expr child = children.get(i);
-            final Expr newChild = child.getResultValue(inView);
+            final Expr newChild = child.getResultValue(forPushDownPredicatesToView);
             if (newChild != child) {
                 setChild(i, newChild);
             }

fe/fe-core/src/main/java/org/apache/doris/analysis/InPredicate.java

@@ -308,8 +308,8 @@ public class InPredicate extends Predicate {
     }
 
     @Override
-    public Expr getResultValue(boolean inView) throws AnalysisException {
-        recursiveResetChildrenResult(inView);
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
+        recursiveResetChildrenResult(forPushDownPredicatesToView);
         final Expr leftChildValue = getChild(0);
         if (!(leftChildValue instanceof LiteralExpr) || !isLiteralChildren()) {
             return this;

fe/fe-core/src/main/java/org/apache/doris/analysis/IsNullPredicate.java

@@ -155,8 +155,10 @@ public class IsNullPredicate extends Predicate {
      * fix issue 6390
      */
     @Override
-    public Expr getResultValue(boolean inView) throws AnalysisException {
-        recursiveResetChildrenResult(inView);
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
+        // Don't push down predicate to view for is null predicate because the value can contain null
+        // after outer join
+        recursiveResetChildrenResult(!forPushDownPredicatesToView);
         final Expr childValue = getChild(0);
         if (!(childValue instanceof LiteralExpr)) {
             return this;

fe/fe-core/src/main/java/org/apache/doris/analysis/SlotRef.java

@@ -613,8 +613,8 @@ public class SlotRef extends Expr {
     }
 
     @Override
-    public Expr getResultValue(boolean foldSlot) throws AnalysisException {
-        if (!foldSlot) {
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
+        if (!forPushDownPredicatesToView) {
             return this;
         }
         if (!isConstant() || desc == null) {
@@ -626,7 +626,7 @@ public class SlotRef extends Expr {
         }
         Expr expr = exprs.get(0);
         if (expr instanceof SlotRef) {
-            return expr.getResultValue(foldSlot);
+            return expr.getResultValue(forPushDownPredicatesToView);
         }
         if (expr.isConstant()) {
             return expr;

fe/fe-core/src/main/java/org/apache/doris/analysis/VariableExpr.java

@@ -137,7 +137,7 @@ public class VariableExpr extends Expr {
     }
 
     @Override
-    public Expr getResultValue(boolean inView) throws AnalysisException {
+    public Expr getResultValue(boolean forPushDownPredicatesToView) throws AnalysisException {
         if (!Strings.isNullOrEmpty(name) && VariableVarConverters.hasConverter(name)) {
             // Return the string type here so that it can correctly match the subsequent function signature.
             // And we also set `beConverted` to session variable name in StringLiteral, so that it can be cast back

regression-test/data/query_p0/literal_view/lietral_test.out

@@ -1,5 +1,10 @@
 -- This file is automatically generated. You should know what you did if you want to edit this
 -- !sql --
 
+-- !left --
+1	doris	10	\N
+2	spark	2	\N
+3	flink	20	\N
+
 -- !sql1 --
 

regression-test/suites/query_p0/literal_view/lietral_test.groovy

@@ -106,6 +106,15 @@ suite("literal_view_test") {
         insert into test_insert values (1,'doris',10),(2,'spark',2),(3,'flink',20);
     """
 
+    sql "set enable_nereids_planner=false"
+    order_qt_left """select * 
+        from test_insert 
+        left join (select 1 as v1) t1 
+        on false 
+        where t1.v1 is null
+    """
+    sql "set enable_nereids_planner=true"
+
     qt_sql1 """
         select id, name
         from (