SQL to reproduce:
```
SELECT * FROM table WHERE where FROM_UNIXTIME(d_datekey,'%Y-%m-%d %H:%i:%s') != '1970-08-20 00:11:43';
org.apache.doris.common.AnalysisException: errCode = 2, detailMessage = Unexpected exception: Illegal pattern character 'i'
at org.apache.doris.qe.StmtExecutor.analyze(StmtExecutor.java:584) ~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.StmtExecutor.execute(StmtExecutor.java:345) ~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.StmtExecutor.execute(StmtExecutor.java:318) ~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.ConnectProcessor.handleQuery(ConnectProcessor.java:221) ~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.ConnectProcessor.dispatch(ConnectProcessor.java:361) ~[palo-fe.jar:3.4.0]
at org.apache.doris.qe.ConnectProcessor.processOnce(ConnectProcessor.java:562) ~[palo-fe.jar:3.4.0]
at org.apache.doris.mysql.nio.ReadListener.lambda$handleEvent$0(ReadListener.java:50) ~[palo-fe.jar:3.4.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
at java.lang.Thread.run(Thread.java:835) [?:?]
```
Describe the overview of changes.
Just support:
yyyy-MM-dd HH:mm:ss
yyyy-MM-dd
yyyyMMdd
