Wes McKinney created ARROW-786:
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Summary: [Format] In-memory format for 128-bit Decimals, handling
of sign bit
Key: ARROW-786
URL: https://issues.apache.org/jira/browse/ARROW-786
Project: Apache Arrow
Issue Type: Improvement
Components: Format
Reporter: Wes McKinney
cc [~cpcloud]
We found in ARROW-655 that we needed to add an extra bit for signedness for
decimals stored as 128-bit values to be able to use the Boost multiprecision
libraries. This makes Decimal128 not fit completely neatly as a 16-byte fixed
size binary value, and more of a {{struct<sign_bitmap: boolean, data:
fixed_size_binary(16)>}}. What is the current formata in the Java
implementation? We will need to document the memory layout for decimals that
maximizes compatibility across languages and eventually implement integration
tests for IPC.
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