1.插入报错

ClickHouse exception, code: 6, host: xxx.xx.xx.28, port: 8123; Code: 6, e.displayText() = DB::Exception: Cannot parse string '12345 ' as Int64: syntax error at begin of string. Note: there are toInt64OrZero and toInt64OrNull functions, which returns zero/NULL instead of throwing exception.: while executing 'FUNCTION CAST(assumeNotNull(_dummy_0) :: 2, 'Int64' :: 1) -> CAST(assumeNotNull(_dummy_0), 'Int64') Int64 : 4' (version 21.3.2.5 (official build))

可能原因：
传入的数字字符串有空格，clickhouse自动解析时空格报错

2.无法执行ddl(alter 操作)

Cannot execute replicated DDL query on leader;

这里原因比较多，后面有详细的报文，按照提示来，如果是表太大，先按照分区DROP一部分再DROP TABLE，如果是其他的，需要在分析。

3.Cannot parse string ‘2021-11-26 09:25:00:000’ as DateTime64(3)

Cannot parse string '2021-11-26 09:25:00:000' as DateTime64(3): syntax error at position 19 (parsed just '2021-11-26 09:25:00'): while executing 'FUNCTION CAST(assumeNotNull(_dummy_0) :: 2, 'DateTime64(3)' :: 1) -> CAST(assumeNotNull(_dummy_0), 'DateTime64(3)') DateTime64(3) : 4' (version 21.3.2.5 (official build))

date_time DateTime64(3) COMMENT ‘日期时间，精度到秒’ CODEC(DoubleDelta,LZ4)
这种是支持毫秒的，但是格式是 yyyy-MM-dd HH:mm:ss.SSS
我这边犯了个错误 yyyy-MM-dd HH:mm:ss:SSS 写成这样的导致出错。