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Add decimal IPC parquet support - #4

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pbower merged 9 commits into
mainfrom
decimal-ipc-parquet-support
Sep 10, 2026
Merged

Add decimal IPC parquet support#4
pbower merged 9 commits into
mainfrom
decimal-ipc-parquet-support

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@pbower pbower commented Sep 10, 2026

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Arrow IPC: The FlatBuffers schema, record batch encoder, and decoder
now handle Decimal32, Decimal64, and Decimal128 columns. The Decimal
table struct carries precision, scale, and bitWidth. Data buffers are
read and written as raw fixed-width integers matching the underlying
storage type.

Parquet: The type mapping, writer, and reader support decimal columns.
Decimal32 and Decimal64 use INT32 and INT64 physical types with
DECIMAL converted type. Decimal128 uses FIXED_LEN_BYTE_ARRAY(16) with
big-endian two's complement encoding per the Parquet specification.

All code is gated behind cfg(feature = "decimal").
…PC code and Decimal128 as FIXED_LEN_BYTE_ARRAY in Parquet
…dth decimals and unit-correct temporal storage
…o decimal-ipc-parquet-support

# Conflicts:
#	CHANGELOG.md
@pbower
pbower merged commit b2d7d5f into main Sep 10, 2026
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@pbower
pbower deleted the decimal-ipc-parquet-support branch September 10, 2026 06:07
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