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Logical Type	Java	C++	JavaScript	Notes
Null	No	No	No	C++ has NullType, NullArray type
Boolean	Yes	Yes	Yes
Signed Integers	Yes	Yes	Yes	TODO: Use strings for 64-bit integers
Unsigned Integers	No	Yes	Yes	TODO: Use strings for 64-bit integers Unsigned integers are being generated in the integration test suite (code), but Java's interpretation of them may be incorrect
Half Precision FP	No	No	No	C++ supports HalfFloat container type / NumPy interop
Single Precision FP	Yes	Yes	Yes
Double Precision FP	Yes	Yes	Yes
Variable Binary	Yes	Yes	Yes
Variable String (UTF8)	Yes	Yes	Yes
Fixed Size Binary	Yes	Yes	Yes
Variable List	Yes	Yes	Yes
Fixed Size List	No	No	No	Java and JS have FSL container type, C++ does not yet Integration tests not being generated yet
Decimal 128-bit	Yes	Yes	Yes	Q: What is JavaScript's level of support for this?
Timestamp	Yes	Yes	Yes
Date (32/64-bit varieties)	Yes	Yes	Yes
Time	Yes	Yes	Yes
Interval MONTH_DAY	NoYesNo	Yes	No	See discussion below
Interval DAY_TIME (Timedelta)	NoYesNo	Yes	No	See discussion below
Duration	Yes	Yes	No
Dictionary-encoded Types	Yes	Yes	Yes
Struct	Yes	Yes	Yes
Dense Union	No	No	No	See discussion below
Sparse Union	No	No	No	See discussion below
Map	No	No	No

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Not implemented in one or more reference implementations
Implemented in different ways, or only supporting a subset of the desired specification
Not being integration tested; binary compatibility between implementations not being validated

Interval / Timedelta

UPDATE (2019-05-16): This was resolved in ARROW-835 https://github.com/apache/arrow/commit/6f80ea4928f0d26ca175002f2e9f511962c8b012

Presently, the Interval metadata type is as follows:

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