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  1. Calcite
  2. CALCITE-3209

When calling MutableMultiRel::setInput, exception thrown

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      When digging code of materialization matching. I found the current implementation of MutableMultiRel::inputs is by an ImmutableList, thus impossible to be changed by
      https://github.com/apache/calcite/blob/master/core/src/main/java/org/apache/calcite/rel/mutable/MutableMultiRel.java#L42

       @Override public void setInput(int ordinalInParent, MutableRel input)

      Seems a mistake.

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            Unassigned Unassigned
            jinxing6042@126.com Jin Xing
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