[BUG] Java `Scalar` does not consider Decimal scale for `.hashCode()`/`.equals()`

[mythrocks]

In its current implementation, the Scalar Java class does not consider the scale of a scalar value, when comparing two DECIMAL scalars.

Here is the section of Scalar.equals() that compares DECIMAL64 values:

    case DECIMAL64:
      return getLong() == other.getLong();

getLong() does not rescale the representative value of the scalar, based on a common scale. This implementation will equate two DECIMAL64 scalars of different scales, if their rep values are equal.

A similar argument could be made for Scalar.hashCode():

      case DECIMAL64:
      // ...
        valueHash = Long.hashCode(getLong());
        break;

AFAICT, the problem applies to DECIMAL32 and DECIMAL64, but not DECIMAL128. In adding support for DECIMAL128 in #11645, the comparisons are made using BigDecimal, rather than BigInteger.

[mythrocks]

Closing this as invalid; both hashCode() and equals() are correct.

1. Scalar.hashCode() returns Objects.hashCode(type, valueHash). type includes the scale.
2. Scalar.equals() compares type first, before proceeding to compare values. type, again, includes the scale.

Apologies for the noise. This bug is invalid.

[github-actions[bot]]

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[revans2]

This would sill be good to fix