sideEffectResult: Seq[InternalRow]ExecutedCommandExec Physical Operator for Command Execution
ExecutedCommandExec is a SparkPlan for RunnableCommands.
ExecutedCommandExec runs a command and caches the result in sideEffectResult internal attribute.
sideEffectResult Internal Lazy Attribute
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.
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Caution
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FIXME CatalystTypeConverters.createToCatalystConverter?
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