Support Exponentiation in WfSpec DSL #2240

Background

1. In WfSpecs, we allow users to work with numeric VariableValues of type INT, DOUBLE
2. We allow users to perform a few different VariableMutationTypes on numeric VariableValues: ADD, SUBTRACT, MULTIPLY, DIVIDE

Proposal

We should support an exponentiation VariableMutationType that allows you to perform expressions such as:

x² -> x.pow(2)
sqrt(x) -> x.pow(0.5)

Acceptance Criteria

1. Add an exponentiation POW VariableMutationType enum
2. Add .pow() to LHExpression
3. Support POW only for numeric VariableValue cases
4. A few special cases that come to mind:

5. Exceptions should be thrown as early as possible; for example if we know that the Exponent or Base are not numbers at PutWfSpec time, we should reject the request. If they can't be determined at PutWfSpec time, like Case 5, we should throw a VAR_SUB_ERROR if the case is reached.

Out of Scope

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Implementation

• Kernel (/server): feat(server): add POW VariableMutationType #2243
• Java SDK: feat(server): add POW VariableMutationType #2243
• .NET SDK: feat(sdk-dotnet): add pow operation #2244
• Python SDK: feat(sdk-python): add pow operation #2246
• Go SDK: feat(sdk-go): add pow operation #2245

Documentation

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Additional Context

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