Hi, According to https://arrow.apache.org/docs/cpp/api/utilities.html, Decimal128 comes from the Apache ORC C++ implementation.
When I see the Hive document at https://hive.apache.org/javadocs/r1.2.2/api/index.html?org/apache/hadoop/hive/common/type/Decimal128.html , there is the following statement. Does it help you? > A 128-bit fixed-length Decimal value in the ANSI SQL Numeric semantics, representing unscaledValue / 10**scale where scale is 0 or positive. Regards, Kazuaki Ishizaki From: Jacek Pliszka <jacek.plis...@gmail.com> To: dev@arrow.apache.org Date: 2020/07/02 00:08 Subject: [EXTERNAL] Re: Decimal128 scale limits Hi! I am aware about at least 2 different decimal128 things: a) the one we have - where we use 128 bits to store integer which is later shifted by scale - 38 is number of digits of significand i.e. digits fitting in 128 bits (2**128/10**38) - IMHO it is completely unrelated to scale which we store separately b) IEEE 754 one which has exponent from -6143 to +6144 BR, Jacek śr., 1 lip 2020 o 16:16 Antoine Pitrou <anto...@python.org> napisał(a): > > > Hello, > > Are there limits to the value of the scale for either decimal128 or > decimal? Can it be negative? Can it be greater than 38 (and/or lower > than -38)? > > It's not clear from looking either at the spec or at the C++ code... > > Regards > > Antoine.
