Github user twalthr commented on the pull request:
https://github.com/apache/flink/pull/1237#issuecomment-159229093
Most input formats won't use the adaptive sources. Sure performance is not
that important in the pre-flight phase, but if we always think so, the
pre-flight phase will some day take minutes. Simplicity is key but IMHO it is
simpler from an extension point of view to implement an interface that fits to
the need. One type is evaluated immediately the other is lazy evaluated during
translation. I think this is differentiation/argument enough for 2 interfaces.
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