ExecutedCommandExec Physical Operator for Command Execution

ExecutedCommandExec is a SparkPlan for executing logical commands with side effects.

ExecutedCommandExec runs a command and caches the result in sideEffectResult internal attribute.

sideEffectResult Internal Lazy Attribute

sideEffectResult: Seq[InternalRow]

sideEffectResult runs the RunnableCommand (that produces a Seq[Row]) and converts the result to a Seq[InternalRow] using a Catalyst converter function for a given schema.

FIXME CatalystTypeConverters.createToCatalystConverter?

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