[C++][Parquet] Parquet writer supports writing int32/int64 for decimal type #15239
Description
Describe the enhancement requested
As the parquet specs states below, decimal types with small precision can use int32/int64 physical types.
DECIMAL can be used to annotate the following types:
- int32: for 1 <= precision <= 9
- int64: for 1 <= precision <= 18; precision < 10 will produce a warning
- fixed_len_byte_array: precision is limited by the array size. Length n can store <= floor(log_10(2^(8*n - 1) - 1)) base-10 digits
- binary: precision is not limited, but is required. The minimum number of bytes to store the unscaled value should be used.
The aim of this issue is to provide a writer option to write decimal types using int32 when 1 <= precision <= 9 and int64 when 10 <= precision <= 18.
Component(s)
C++, Parquet