bug fixed for mysql parser, for issue #2718

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -2270,6 +2270,8 @@ public class SQLExprParser extends SQLParser {
                     }
 
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.Equality, rightExp, dbType);
+                } else {
+                    return expr;
                 }
                 break;
             case TILDE:
@@ -2281,6 +2283,8 @@ public class SQLExprParser extends SQLParser {
                     rightExp = relationalRest(rightExp);
 
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.POSIX_Regular_Match, rightExp, getDbType());
+                } else {
+                    return expr;
                 }
                 break;
             case TILDE_STAR:
@@ -2288,6 +2292,8 @@ public class SQLExprParser extends SQLParser {
                     lexer.nextToken();
                     rightExp = relational();
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.POSIX_Regular_Match_Insensitive, rightExp, getDbType());
+                } else {
+                    return expr;
                 }
                 break;
             case BANG_TILDE:
@@ -2295,6 +2301,8 @@ public class SQLExprParser extends SQLParser {
                     lexer.nextToken();
                     rightExp = relational();
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.POSIX_Regular_Not_Match, rightExp, getDbType());
+                } else {
+                    return expr;
                 }
                 break;
             case BANG_TILDE_STAR:
@@ -2302,6 +2310,8 @@ public class SQLExprParser extends SQLParser {
                     lexer.nextToken();
                     rightExp = relational();
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.POSIX_Regular_Not_Match_POSIX_Regular_Match_Insensitive, rightExp, getDbType());
+                } else {
+                    return expr;
                 }
                 break;
             case TILDE_EQ:
@@ -2309,6 +2319,8 @@ public class SQLExprParser extends SQLParser {
                     lexer.nextToken();
                     rightExp = relational();
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.SAME_AS, rightExp, getDbType());
+                } else {
+                    return expr;
                 }
                 break;
             case RLIKE:
@@ -2338,6 +2350,8 @@ public class SQLExprParser extends SQLParser {
                     rightExp = relational();
 
                     expr = new SQLBinaryOpExpr(expr, SQLBinaryOperator.SIMILAR_TO, rightExp, getDbType());
+                } else {
+                    return expr;
                 }
                 break;
             default:

src/test/java/com/alibaba/druid/bvt/sql/mysql/select/MySqlSelectTest_196_wall.java

@@ -0,0 +1,25 @@
+package com.alibaba.druid.bvt.sql.mysql.select;
+
+import com.alibaba.druid.sql.MysqlTest;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.parser.ParserException;
+
+import java.util.List;
+
+public class MySqlSelectTest_196_wall extends MysqlTest {
+
+    public void test_0() throws Exception {
+        String sql = "update task_info set priority = 1, content = 'x渓螼h\u0013[\u0014\u0006饆蜭�)漉=灔�\u000B\u0011\u0011u�\uE06A圥Z[\u0017殞c怈﹝櫃&c摍0\u007Fj璟\u0004]JWRb峌膮埜\u0014譢\"瓺\\\\塼!.D牡玕\"邥\t� 佥篼緖.W=Rw4�\u001E3\t玭YF螭�\u0004�);\u0011�I\u0017�%\u0017谦漜f*\bm梄恀拒t)/�I�\"uSP蟉�\u0006I3\\\"�\u0016敐\f\\Z殷觀n\\\"餭讖;祵Y換g\uE5B7&柋\u0017�\u0011﹗A欍媞(I=\u0010�x鐹�\u000B!蜿\u0006\u0013�lQw�(33毳圳倀!\uE324=&释烃襲�&b\uE1EF�\u0013mm孺L\u0014嚍_MS7湏痘笫滴;y鶲\b爱骤求秩G-\u001By~殿揀\uE222�\u0003鮝[�Dqo:蟎'~=裼�\u001F垴蟵\\rY�\u0013.\uE3F9R\u000E�\u0012滂燶n鑲�\u0002贛龎=\u0010ミ�\u0007/%�\u001C癳c�\u000E\\Z旊\u001B�\u000B2栣玄岜�#cc吜\uE6C5�\u001B嚮醽nx�\u001B巘肅輕4E鎊\u0018E\u0018跴欱貯i\u0007蘉渚秘\u0007c\u00129狓\u0004F\u001F\f\u0013�觠3\u000B��-XS8�\u0010�\u0019V\u001E諭餸�\u000Fk\\r|\u0014V\u0005躒_A彙?E�*�\u0015琔�\u001Ep共\u000B�\u0006Z\u001F�%楳�\u001D\u001C玾郳\"\uE26B\u0011�\u0006Jｊ\u0016h\u0005�\u001C�\u0002�\u0002�\u0004j貌`.�\u0001�\u0005韁\"�\u0006z佉\u0012�\u001CxQ�\u0007\u0017@呃-斵曼\\0k砛0k\u0003鬨Z\uE5E9\u007F\u0006^�\u000Es\u0005欳B�\f\\0\\0��+僜'�', attribute = 0, create_time = from_unixtime(1531714297) where id = 2726633030";
+
+        Exception error = null;
+        try {
+            MySqlStatementParser parser = new MySqlStatementParser(sql);
+            List<SQLStatement> statementList = parser.parseStatementList();
+        } catch (ParserException ex) {
+            error = ex;
+        }
+
+        assertNotNull(error);
+    }
+}