并发问题

select 字段1 + '#'+字段2 from table_1

我要表达的意思是不支持并发，根本原因是 ExpressionTranslator这个类的 marksList与funcsList 是static对象，这边能优化这个地方么？

java.sql.SQLException: String index out of range: -1
at com.esproc.jdbc.InternalStatement.executeJDBC(InternalStatement.java:286)
at com.esproc.jdbc.InternalStatement$1.run(InternalStatement.java:148)
Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: -1
at java.lang.AbstractStringBuilder.replace(AbstractStringBuilder.java:851)
at java.lang.StringBuffer.replace(StringBuffer.java:452)
at com.scudata.dm.query.utils.ExpressionTranslator.moveInMarks(ExpressionTranslator.java:257)
at com.scudata.dm.query.utils.ExpressionTranslator.translateExp(ExpressionTranslator.java:115)
at com.scudata.dm.query.SimpleSelect.execute(SimpleSelect.java:6298)
at com.scudata.dm.query.SimpleSelect.query(SimpleSelect.java:3007)
at com.scudata.dm.query.SimpleJoin.query(SimpleJoin.java:5129)
at com.scudata.dm.query.SimpleUnion.query(SimpleUnion.java:84)
at com.scudata.dm.query.SimpleSQL.execute(SimpleSQL.java:140)
at com.scudata.app.common.AppUtil.executeSql(AppUtil.java:198)
at com.esproc.jdbc.JDBCUtil.execute(JDBCUtil.java:398)
at com.esproc.jdbc.InternalStatement.executeJDBC(InternalStatement.java:267)
... 1 common frames omitted

Start in ExpressionTranslator.java at translateExp and moveInMarks, then inspect how the static marksList and funcsList are used during the failing SQL execution. Reproduce the reported query with concurrent executions and trace the String index error. Done means concurrent queries no longer produce the reported SQLException.