Add a separate addNestedJoin() method

h2/src/main/org/h2/command/Parser.java

@@ -1733,7 +1733,7 @@ public class Parser {
                     on = readExpression();
                 }
                 top = getNested(top);
-                join.addJoin(top, true, false, on);
+                join.addJoin(top, true, on);
                 top = join;
             } else if (readIf("LEFT")) {
                 readIf("OUTER");
@@ -1744,7 +1744,7 @@ public class Parser {
                 if (readIf("ON")) {
                     on = readExpression();
                 }
-                top.addJoin(join, true, false, on);
+                top.addJoin(join, true, on);
             } else if (readIf("FULL")) {
                 throw getSyntaxError();
             } else if (readIf("INNER")) {
@@ -1755,7 +1755,7 @@ public class Parser {
                 if (readIf("ON")) {
                     on = readExpression();
                 }
-                top.addJoin(join, false, false, on);
+                top.addJoin(join, false, on);
             } else if (readIf("JOIN")) {
                 join = readTableFilter();
                 top = readJoin(top, false);
@@ -1763,11 +1763,11 @@ public class Parser {
                 if (readIf("ON")) {
                     on = readExpression();
                 }
-                top.addJoin(join, false, false, on);
+                top.addJoin(join, false, on);
             } else if (readIf("CROSS")) {
                 read("JOIN");
                 join = readTableFilter();
-                top.addJoin(join, false, false, null);
+                top.addJoin(join, false, null);
             } else if (readIf("NATURAL")) {
                 read("JOIN");
                 join = readTableFilter();
@@ -1799,7 +1799,7 @@ public class Parser {
                         }
                     }
                 }
-                top.addJoin(join, false, false, on);
+                top.addJoin(join, false, on);
             } else {
                 break;
             }
@@ -1817,7 +1817,7 @@ public class Parser {
         TableFilter top = new TableFilter(session, getDualTable(true),
                 joinTable, rightsChecked, currentSelect, n.getOrderInFrom(),
                 null);
-        top.addJoin(n, false, true, null);
+        top.addNestedJoin(n);
         return top;
     }
 
@@ -2490,7 +2490,7 @@ public class Parser {
                                 int idx = filters.indexOf(rightFilter);
                                 if (idx >= 0) {
                                     filters.remove(idx);
-                                    leftFilter.addJoin(rightFilter, true, false, r);
+                                    leftFilter.addJoin(rightFilter, true, r);
                                 } else {
                                     rightFilter.mapAndAddFilter(r);
                                 }

h2/src/main/org/h2/command/dml/Optimizer.java

@@ -247,7 +247,7 @@ class Optimizer {
         TableFilter[] f2 = bestPlan.getFilters();
         topFilter = f2[0];
         for (int i = 0; i < f2.length - 1; i++) {
-            f2[i].addJoin(f2[i + 1], false, false, null);
+            f2[i].addJoin(f2[i + 1], false, null);
         }
         if (parse) {
             return;

h2/src/main/org/h2/table/TableFilter.java

@@ -637,44 +637,39 @@ public class TableFilter implements ColumnResolver {
      *
      * @param filter the joined table filter
      * @param outer if this is an outer join
-     * @param nested if this is a nested join
      * @param on the join condition
      */
-    public void addJoin(TableFilter filter, boolean outer, boolean nested, Expression on) {
+    public void addJoin(TableFilter filter, boolean outer, Expression on) {
         if (on != null) {
             on.mapColumns(this, 0);
             TableFilterVisitor visitor = new MapColumnsVisitor(on);
             visit(visitor);
             filter.visit(visitor);
         }
-        if (nested) {
-            if (nestedJoin != null) {
-                throw DbException.throwInternalError();
-            }
-            nestedJoin = filter;
+        if (join == null) {
+            join = filter;
             filter.joinOuter = outer;
             if (outer) {
-                visit(new JOIVisitor());
+                filter.visit(new JOIVisitor());
             }
             if (on != null) {
                 filter.mapAndAddFilter(on);
             }
         } else {
-            if (join == null) {
-                join = filter;
-                filter.joinOuter = outer;
-                if (outer) {
-                    filter.visit(new JOIVisitor());
-                }
-                if (on != null) {
-                    filter.mapAndAddFilter(on);
-                }
-            } else {
-                join.addJoin(filter, outer, false, on);
-            }
+            join.addJoin(filter, outer, on);
         }
     }
 
+    /**
+     * Add a nested joined table.
+     *
+     * @param filter the joined table filter
+     */
+    public void addNestedJoin(TableFilter filter) {
+        nestedJoin = filter;
+        filter.joinOuter = false;
+    }
+
     /**
      * Map the columns and add the join condition.
      *