我们对用户在使用习惯了Hive之后,在写一些flink sql对时候经常碰到大小写对困扰。
使用对是默认对catalog。

```
Caused by: org.apache.calcite.sql.validate.SqlValidatorException: Column
'uid' not found in any table; did you mean 'Uid'?
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
    at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
    at
org.apache.calcite.runtime.Resources$ExInstWithCause.ex(Resources.java:463)
    at org.apache.calcite.runtime.Resources$ExInst.ex(Resources.java:572)
    ... 28 more

```



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**************************************
 tivanli
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