Apache License

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vector/src/main/java/org/apache/arrow/vector/util/IntObjectHashMap.java

vector/src/main/java/org/apache/arrow/vector/util/IntObjectMap.java

These file are derived from code from Netty, which is made available under the

Apache License 2.0.

--------------------------------------------------------------------------------

memory/memory-core/src/main/java/org/apache/arrow/util/Preconditions.java

This product includes software from Google Guava, which is made available under the

Apache License 2.0.

* Copyright (C) 2007 The Guava Authors

* https://github.com/google/guava