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doris/docs/en/sql-reference/sql-functions/date-time-functions/from_unixtime.md
Lijia Liu 22a0011403 [fix](planner) Convert format in RewriteFromUnixTimeRule (#8235) 
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
2022-03-05 15:26:37 +08:00

2.0 KiB
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title, language
title language
from_unixtime en

from_unixtime

description

syntax

DATETIME FROM UNIXTIME (INT unix timestamp [, VARCHAR string format]

Convert the UNIX timestamp to the corresponding time format of bits, and the format returned is specified by string_format

Input is an integer and return is a string type

Support date_format's format, and default is %Y-%m-%d %H:%i:%s

Other string_format is illegal and will returns NULL.

example

mysql> select from_unixtime(1196440219);
+---------------------------+
| from_unixtime(1196440219) |
+---------------------------+
| 2007-12-01 00:30:19       |
+---------------------------+

mysql> select from_unixtime(1196440219, '%Y-%m-%d');
+-----------------------------------------+
| from_unixtime(1196440219, '%Y-%m-%d')   |
+-----------------------------------------+
| 2007-12-01                              |
+-----------------------------------------+

mysql> select from_unixtime(1196440219, '%Y-%m-%d %H:%i:%s');
+--------------------------------------------------+
|From unixtime (1196440219,'%Y-%m-%d %H:%i:%s')    |
+--------------------------------------------------+
| 2007-12-01 00:30:19                              |
+--------------------------------------------------+

## keyword

    FROM_UNIXTIME,FROM,UNIXTIME