mysql function error `SELECT GET_LOCK('cc', 1800)`

[wtog]

lealone version

6.0.0-SNAPSHOT

sql in mysql

SELECT GET_LOCK('airflow_MIGRATIONS', 1800)

lealone error

org.lealone.common.exceptions.JdbcSQLException: Function "GET_LOCK" not found; SQL statement:
SELECT GET_LOCK('airflow_MIGRATIONS', 1800) [90022-0]
    at org.lealone.common.exceptions.DbException.getJdbcSQLException(DbException.java:342)
    at org.lealone.common.exceptions.DbException.get(DbException.java:173)
    at org.lealone.common.exceptions.DbException.get(DbException.java:150)
    at org.lealone.sql.SQLParserBase.readJavaFunction(SQLParserBase.java:2270)
    at org.lealone.sql.SQLParserBase.readFunction(SQLParserBase.java:2327)
    at org.lealone.sql.SQLParserBase.readTerm(SQLParserBase.java:2654)
    at org.lealone.sql.SQLParserBase.readFactor(SQLParserBase.java:2184)
    at org.lealone.sql.SQLParserBase.readSum(SQLParserBase.java:2171)
    at org.lealone.sql.SQLParserBase.readConcat(SQLParserBase.java:2144)
    at org.lealone.sql.SQLParserBase.readCondition(SQLParserBase.java:2008)
    at org.lealone.sql.SQLParserBase.readAnd(SQLParserBase.java:1989)
    at org.lealone.sql.SQLParserBase.readExpression(SQLParserBase.java:1981)
    at org.lealone.sql.SQLParserBase.parseSelectSimpleSelectPart(SQLParserBase.java:1708)
    at org.lealone.sql.SQLParserBase.parseSelectSimple(SQLParserBase.java:1531)
    at org.lealone.sql.SQLParserBase.parseSelectSub(SQLParserBase.java:1508)
    at org.lealone.sql.SQLParserBase.parseSelectUnion(SQLParserBase.java:1478)
    at org.lealone.sql.SQLParserBase.parseSelect(SQLParserBase.java:1466)
    at org.lealone.sql.SQLParserBase.parseStatement(SQLParserBase.java:455)
    at org.lealone.sql.SQLParserBase.parse(SQLParserBase.java:327)
    at org.lealone.sql.SQLParserBase.parse(SQLParserBase.java:285)
    at org.lealone.sql.SQLParserBase.parse(SQLParserBase.java:1)
    at org.lealone.db.session.ServerSession.prepareStatement(ServerSession.java:476)
    at org.lealone.plugins.mysql.server.MySQLServerConnection.prepareStatement(MySQLServerConnection.java:186)
    at org.lealone.plugins.mysql.server.MySQLServerConnection.executeStatement(MySQLServerConnection.java:205)
    at org.lealone.plugins.mysql.server.handler.CommandPacketHandler.handle(CommandPacketHandler.java:37)
    at org.lealone.plugins.mysql.server.MySQLServerConnection.handle(MySQLServerConnection.java:388)
    at org.lealone.net.nio.NioEventLoop.read(NioEventLoop.java:275)
    at org.lealone.net.nio.NioEventLoop.handleSelectedKeys(NioEventLoop.java:492)
    at org.lealone.net.NetScheduler.runEventLoop(NetScheduler.java:62)
    at org.lealone.server.scheduler.GlobalScheduler.run(GlobalScheduler.java:70)
    at java.base/java.lang.Thread.run(Thread.java:829)

[codefollower]

GET_LOCK 这个函数还没有实现。