补充测试用例 alibaba#5847

补充测试用例 alibaba#5847

core/src/test/java/com/alibaba/druid/bvt/sql/postgresql/issues/Issue5847.java

@@ -0,0 +1,51 @@
+package com.alibaba.druid.bvt.sql.postgresql.issues;
+
+import java.util.List;
+
+import com.alibaba.druid.DbType;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.parser.SQLParserUtils;
+import com.alibaba.druid.sql.parser.SQLStatementParser;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * 优化括号解析之后的sql验证
+ *
+ * @author lizongbo
+ * @see <a href="https://github.com/alibaba/druid/issues/5847">Issue来源</a>
+ */
+public class Issue5847 {
+
+    @Test
+    public void test_parse() {
+        for (String sql : new String[]{
+            "select * from tb_test limit 10 offset ( (2 - 1) * 1 );",
+        }) {
+            SQLStatementParser parser1 = SQLParserUtils.createSQLStatementParser(sql, DbType.postgresql);
+            List<SQLStatement> statementList1 = parser1.parseStatementList();
+            System.out.println("原始的sql===" + sql);
+            String sqleNew = statementList1.get(0).toString();
+            System.out.println("生成的sql===" + sqleNew);
+            SQLStatementParser parser2 = SQLParserUtils.createSQLStatementParser(sqleNew, DbType.postgresql);
+            List<SQLStatement> statementList2 = parser2.parseStatementList();
+            String sqleNew2 = statementList2.get(0).toString();
+            System.out.println("再次解析生成的sql===" + sqleNew);
+            assertEquals(sqleNew, sqleNew2);
+
+            assertEquals("SELECT *\n"
+                + "FROM tb_test\n"
+                + "LIMIT 10 OFFSET ((2 - 1) * 1);", sqleNew2);
+
+            String formattedSql = SQLUtils.format(sql, DbType.dm);
+            System.out.println(formattedSql);
+            assertEquals("SELECT *\n"
+                + "FROM tb_test\n"
+                + "LIMIT 10 OFFSET ((2 - 1) * 1);", formattedSql);
+
+        }
+    }
+}