3次select及以上的Union操作报错

[fruitSandwich]

SELECT * FROM test union SELECT * FROM test 正常转换为 INFO org.elasticsearch.plugin.nlpcn.QueryActionElasticExecutor - Multi Query Explain: performing UNION on : left query: { "from" : 0, "size" : 2 } right query: { "from" : 0, "size" : 2 }

三个select union SELECT * FROM test union SELECT * FROM test union SELECT * FROM test

报异常: Caused by: java.lang.ClassCastException: class com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery cannot be cast to class com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock (com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery and com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock are in unnamed module of loader 'app') at org.nlpcn.es4sql.parse.SqlParser.parseMultiSelect(SqlParser.java:77) at org.nlpcn.es4sql.query.ESActionFactory.create(ESActionFactory.java:49) at org.nlpcn.es4sql.SearchDao.explain(SearchDao.java:46) at com.alibaba.druid.pool.ElasticSearchDruidPooledPreparedStatement.getObjectResult(ElasticSearchDruidPooledPreparedStatement.java:68) at com.alibaba.druid.pool.ElasticSearchDruidPooledPreparedStatement.executeQuery(ElasticSearchDruidPooledPreparedStatement.java:45) ... 9 more

[shi-yuan]

目前不支持3个及以上的