Github user maropu commented on the pull request:
https://github.com/apache/spark/pull/7744#issuecomment-125905838
We must change these getter/setter interfaces?
ISTM that `setDecimal(i: ordinal, value: Decimal)` serializes the value
with the precision/scale that the input decimal value has, and `getDecimal(i:
ordinal)` simply read the value as-is.
The decimal format could be as follows;
(1-bit flag, precision, scale, 4-byte offset) is packed in a 8-byte fixed
part.
The flag represents a following format in a variable-length part.
If 0, 'precision <= 18' and the format is [long].
If 1, '18 < precision <= 38' and the format is [size in long][byte array of
BigDecimal].
Any other compact representations?
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