ege-st opened a new issue, #10921:
URL: https://github.com/apache/pinot/issues/10921
Syntax error messages are very hard to read. Usually, they are just stack
traces from Calcite along with an HTTP Code 200. This creates a very confusing
message for users: a stack trace tells the user that the database itself has
faulted but the 200 code says that everything is fine. Compounding the problem
is that the stack trace is the same across all syntax error messages;
therefore, it does not provide any information on what the syntax problem is or
how to fix it.
The result is a poor user experience for a person trying to learn how to use
Pinot and for experienced people writing complex queries.
The goal for this ticket is to have Pinot return human readable error
messages for syntax problems.
### Example
This query `select * from mytable WHEE ActualElapsedTime = 100` returns this
error:
```
SQLParsingError:
java.lang.Exception: Unable to parse the SQL: 'select * from mytable WHEE
ActualElapsedTime = 100'
at
org.apache.pinot.controller.api.resources.PinotQueryResource.executeSqlQuery(PinotQueryResource.java:144)
at
org.apache.pinot.controller.api.resources.PinotQueryResource.handlePostSql(PinotQueryResource.java:110)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
```
It should return something which states that `WHEE` is invalid like `Invalid
keyword: 'WHEE'` or `Expected 'WHERE' but found 'WHEE'`.
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