fix memory leaks

src/parser/bison_parser.y

@@ -478,7 +478,12 @@ select_no_paren:
 		select_clause opt_order opt_limit {
 			$$ = $1;
 			$$->order = $2;
-			$$->limit = $3;
+
+			// Limit could have been set by TOP.
+			if ($3 != NULL) {
+				delete $$->limit;
+				$$->limit = $3;
+			}
 		}
 	|	select_clause set_operator select_clause opt_order opt_limit {
 			// TODO: allow multiple unions (through linked list)
@@ -487,13 +492,23 @@ select_no_paren:
 			$$ = $1;
 			$$->unionSelect = $3;
 			$$->order = $4;
-			$$->limit = $5;
+
+			// Limit could have been set by TOP.
+			if ($5 != NULL) {
+				delete $$->limit;
+				$$->limit = $5;
+			}
 		}
 	|	select_clause set_operator select_with_paren opt_order opt_limit {
 			$$ = $1;
 			$$->unionSelect = $3;
 			$$->order = $4;
-			$$->limit = $5;
+
+			// Limit could have been set by TOP.
+			if ($5 != NULL) {
+				delete $$->limit;
+				$$->limit = $5;
+			}
 		}
 	;
 

src/sql/Expr.cpp

@@ -2,6 +2,7 @@
 #include "Expr.h"
 #include <stdio.h>
 #include <string.h>
+#include "SelectStatement.h"
 
 namespace hsql {
 
@@ -9,6 +10,8 @@ namespace hsql {
     type(type),
     expr(NULL),
     expr2(NULL),
+    exprList(NULL),
+    select(NULL),
     name(NULL),
     table(NULL),
     alias(NULL) {};
@@ -16,9 +19,17 @@ namespace hsql {
   Expr::~Expr() {
     delete expr;
     delete expr2;
+    delete select;
     free(name);
     free(table);
     free(alias);
+
+    if (exprList != NULL) {
+      for (Expr* e : *exprList) {
+        delete e;
+      }
+      delete exprList;
+    }
   }
 
   Expr* Expr::makeOpUnary(OperatorType op, Expr* expr) {

src/sql/statements.cpp

@@ -193,7 +193,6 @@ namespace hsql {
     delete whereClause;
     delete groupBy;
     delete unionSelect;
-    delete order;
     delete limit;
 
     // Delete each element in the select list.
@@ -203,6 +202,13 @@ namespace hsql {
       }
       delete selectList;
     }
+
+    if (order != NULL) {
+      for (OrderDescription* desc : *order) {
+        delete desc;
+      }
+      delete order;
+    }
   }
 
   // UpdateStatement

test/tpc_h_tests.cpp

@@ -38,6 +38,7 @@ TEST(TPCHQueryTests) {
     } else {
       mt::printOk(file_path.c_str());
     }
+    delete result;
   }
   ASSERT_EQ(testsFailed, 0);
 }