public void test_1() throws Exception {
String sql = "(select * from a) union select * from b";
PGSQLStatementParser parser = new PGSQLStatementParser(sql);
List<SQLStatement> statementList = parser.parseStatementList();
SQLStatement statemen = statementList.get(0);
// print(statementList);
Assert.assertEquals(1, statementList.size());
assertTrue(statemen instanceof PGSelectStatement);
PGSelectStatement select = (PGSelectStatement) statemen;
assertTrue(select.getSelect().getQuery() instanceof SQLUnionQuery);
SQLUnionQuery unionQuery = (SQLUnionQuery) select.getSelect().getQuery();
assertTrue(unionQuery.getLeft() instanceof SQLSelectQueryBlock);
assertTrue(unionQuery.getRight() instanceof SQLSelectQueryBlock);
SQLSelectQueryBlock leftQueryBlock = (SQLSelectQueryBlock) unionQuery.getLeft();
assertTrue(leftQueryBlock.isParenthesized());
}
