plusplusjiajia opened a new pull request, #7608:
URL: https://github.com/apache/paimon/pull/7608
### Purpose
Previously all decimals were serialized as compact (unscaled long in fixed
part), which silently corrupted values exceeding Long.MAX_VALUE.
This change adds non-compact decimal support aligned with BinaryRow:
- Compact (precision <= 18): unscaled long in fixed part
- Non-compact (precision > 18): big-endian signed bytes in 16-byte
variable-length area with (offset << 32 | length) encoding
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