fenfeng9 commented on PR #50723:
URL: https://github.com/apache/arrow/pull/50723#issuecomment-5122639223
Here are some examples from a local GDB session.
```cpp
// Scalars
Decimal32Scalar decimal32_scalar_pos{
Decimal32("1234567"), decimal32(9, 4)};
Decimal64Scalar decimal64_scalar_pos{
Decimal64("12345678901234567"), decimal64(18, 4)};
// Arrays
auto heap_decimal32_array =
SliceArrayFromJSON(
decimal32(9, 4),
R"([null, "-12345.6789", "12345.6789"])");
auto heap_decimal64_array =
SliceArrayFromJSON(
decimal64(18, 4),
R"([null, "-12345678901234.5678", "12345678901234.5678"])");
auto heap_decimal32_array_sliced =
heap_decimal32_array->Slice(1, 1);
```
```python
(gdb) p decimal32_scalar_pos
$1 = arrow::Decimal32Scalar of value 123.4567 [precision=9, scale=4]
(gdb) p decimal64_scalar_pos
$2 = arrow::Decimal64Scalar of value 1234567890123.4567 [precision=18,
scale=4]
(gdb) p *heap_decimal32_array
$3 = (std::__shared_ptr_access<arrow::Array, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type &) @0x43aa50:
arrow::Decimal32Array of type arrow::decimal32(9, 4),
length 3, offset 0, null count 1 = {null, -12345.6789, 12345.6789}
(gdb) p *heap_decimal64_array
$4 = (std::__shared_ptr_access<arrow::Array, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type &) @0x43aaa0:
arrow::Decimal64Array of type arrow::decimal64(18, 4),
length 3, offset 0, null count 1 = {null, -12345678901234.5678,
12345678901234.5678}
(gdb) p *heap_decimal32_array_sliced
$5 = (std::__shared_ptr_access<arrow::Array, (__gnu_cxx::_Lock_policy)2,
false, false>::element_type &) @0x43b060:
arrow::Decimal32Array of type arrow::decimal32(9, 4),
length 1, offset 1, unknown null count = {-12345.6789}
```
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