bug fixed for sql parser, for issue #3080

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

@@ -721,6 +721,7 @@ public class SQLExprParser extends SQLParser {
                         sqlExpr = new SQLUnaryExpr(SQLUnaryOperator.Negative, sqlExpr);
                         break;
                     case BANG:
+                    case CAST:
                         sqlExpr = expr();
                         sqlExpr = new SQLUnaryExpr(SQLUnaryOperator.Negative, sqlExpr);
                         break;
@@ -753,6 +754,7 @@ public class SQLExprParser extends SQLParser {
                         sqlExpr = new SQLUnaryExpr(SQLUnaryOperator.Plus, sqlExpr);
                         break;
                     case SUB:
+                    case CAST:
                         sqlExpr = expr();
                         sqlExpr = new SQLUnaryExpr(SQLUnaryOperator.Plus, sqlExpr);
                         break;

src/test/java/com/alibaba/druid/bvt/sql/mysql/select/MySqlSelectTest_246.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 1999-2017 Alibaba Group Holding Ltd.
+ *
+ * Licensed 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 com.alibaba.druid.bvt.sql.mysql.select;
+
+import com.alibaba.druid.sql.MysqlTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+import com.alibaba.druid.util.JdbcConstants;
+
+
+public class MySqlSelectTest_246 extends MysqlTest {
+
+    public void test_0() throws Exception {
+        String sql = "SELECT -CAST(10 AS decimal(10, 2)), +CAST(10 AS decimal(10, 2))";
+
+
+        SQLSelectStatement stmt = (SQLSelectStatement) SQLUtils.parseSingleStatement(sql, JdbcConstants.MYSQL);
+
+        assertEquals("SELECT -CAST(10 AS decimal(10, 2)), +CAST(10 AS decimal(10, 2))", stmt.toString());
+
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+    }
+
+
+
+}