[jira] [Created] (CALCITE-3209) Store inputs of MutableMultiRel by ArrayList rather than ImmutableList

["jin xing (JIRA)" <ji...@apache.org>]

jin xing created CALCITE-3209:
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             Summary: Store inputs of MutableMultiRel by ArrayList rather than ImmutableList
                 Key: CALCITE-3209
                 URL: https://issues.apache.org/jira/browse/CALCITE-3209
             Project: Calcite
          Issue Type: Bug
          Components: core
            Reporter: jin xing


In current implementation of {{MutableMultiRel}}, {{inputs}} is implemented by a {{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
{code:java}
 @Override public void setInput(int ordinalInParent, MutableRel input)
{code}
Seems a mistake.



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