[I] [Java] Are the constraints of not-nullable MapVector necessary in Java? [arrow]

["whutjs (via GitHub)" <gi...@apache.org>]

whutjs opened a new issue, #44414:
URL: https://github.com/apache/arrow/issues/44414

   ### Describe the usage question you have. Please include as many useful details as  possible.
   
   
   There are two not-nullable constraints in the Java implementation of MapVector:
   1. Map data should be a non-nullable struct type;
   https://github.com/apache/arrow/blob/d4516c5386f84619dfdf2a9f72fed6d7df89704c/java/vector/src/main/java/org/apache/arrow/vector/complex/MapVector.java#L98
   2. Map data key type should be a non-nullable;
   https://github.com/apache/arrow/blob/d4516c5386f84619dfdf2a9f72fed6d7df89704c/java/vector/src/main/java/org/apache/arrow/vector/complex/MapVector.java#L105
   
   Are these constraints necessary? Because I cannot find these constraints in the [Arrow Specifications](https://arrow.apache.org/docs/format/Columnar.html) .
   
   ### Component(s)
   
   Java


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Re: [I] [Java] Are the constraints of not-nullable MapVector necessary in Java? [arrow]

["lidavidm (via GitHub)" <gi...@apache.org>]

lidavidm commented on issue #44414:
URL: https://github.com/apache/arrow/issues/44414#issuecomment-2412668337

   That document is not canonical on its own, as it notes.
   
   https://github.com/apache/arrow/blob/a153dcb7ae1f61e705472574a5890b33db8cb76a/format/Schema.fbs#L138


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