shenyu0127 commented on issue #9504:
URL: https://github.com/apache/pinot/issues/9504#issuecomment-1528187122

   This bug means a feature request: we need to add a new type `timestamp` to 
`Literal` in the 
[query.thrift](https://github.com/apache/pinot/blob/2bcf592d433241b07dcaac82833df4b225617410/pinot-common/src/thrift/query.thrift#L70).
   
   We get an error in query `select cast(cast ('2023-01-01 00:00:00' as 
timestamp) as long) from Table`. This is because the inner `cast` returns a 
`Literal` of type `String` 
([here](https://github.com/apache/pinot/blob/2bcf592d433241b07dcaac82833df4b225617410/pinot-common/src/main/java/org/apache/pinot/sql/parsers/rewriter/CompileTimeFunctionsInvoker.java#L89)
 the `getLiteralExpression` function takes a `Timestamp` object and returns a 
`Literal` of type `String`), which cannot be cast to type `long`.
   
   The same bug was also reported in 
https://github.com/apache/pinot/issues/9853 and @Jackie-Jiang identified the 
missing feature.


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