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1. "Root" exception classes are HyracksDataException for runtime errors and AlgebricksException for compilation errors.
2. Exeptions declared in throws clause in method signatures must be of those types to avoid wrapping of exceptions to satisfy interfaces.
3. Every exception should contain an error code that uniquely identifies the error and the error message template. In addition to the error code each exception has a fixed set of parameters that are used to parameterize the error message.  Error  Error messages should not be defined in the source code but be in configuration files. The goal of the error code is to enable error messages in different languages, evolution of error messages without breaking error identifiers, and the ability to easily search for problems (and solutions) in search engines.
4. Subclasses of the root exceptions can be used to simplify the construction of exception objects and to increase readability of the code.

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