Nondeterministic Expressions¶

Nondeterministic is an extension of the Expression abstraction for non-deterministic, non-foldable expressions.

Nondeterministic expressions should be initialized (with the partition ID) before evaluation.

Contract¶

Internal Interpreted Expression Evaluation¶

evalInternal(
  input: InternalRow): Any

See:

• CallMethodViaReflection
• MonotonicallyIncreasingID

Used when:

• Nondeterministic expression is requested to evaluate

Internal Initialize¶

initializeInternal(
  partitionIndex: Int): Unit

See:

• CallMethodViaReflection
• MonotonicallyIncreasingID

Used when:

• Nondeterministic is requested to initialize

Implementations¶

• CallMethodViaReflection
• MonotonicallyIncreasingID
• others

Deterministic¶

deterministic: Boolean

deterministic is always false.

Foldable¶

foldable: Boolean

foldable is always false.

Initialize¶

initialize(
  partitionIndex: Int): Unit

initialize initializeInternal and sets the initialized internal flag to true.

initialize is used when:

• ExpressionsEvaluator is requested to initializeExprs
• GenerateExec physical operator is requested to doExecute