[GitHub] [calcite] jinxing64 opened a new pull request #1329: [CALCITE-3209] Store inputs of MutableMultiRel by ArrayList rather than ImmutableList

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jinxing64 opened a new pull request #1329: [CALCITE-3209] Store inputs of MutableMultiRel by ArrayList rather than ImmutableList
URL: https://github.com/apache/calcite/pull/1329
 
 
   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.
   This PR propose to store inputs of MutableMultiRel by ArrayList rather than ImmutableList

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