public ExecutionConfig setExecutionConfig(ExecutionConfig config) {
		ExecutionConfig prev = executionConfig;
		this.executionConfig = config;
		return prev;
	}
public ExecutionConfig setExecutionConfig ( ExecutionConfig config ) { ExecutionConfig prev = executionConfig ; this . executionConfig = config ; return prev ; }
Replaces the existing {@link ExecutionConfig} (possibly {@code null}), with the provided one.
@param config The new {@code configuration}.
@return The old configuration, or {@code null} if none was specified.