raminqaf commented on code in PR #29323:
URL: https://github.com/apache/flink/pull/29323#discussion_r4131456837
##########
flink-core/src/main/java/org/apache/flink/types/variant/BinaryVariantInternalBuilder.java:
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@@ -271,6 +276,33 @@ public void appendDecimal(BigDecimal d) {
}
}
+ // The variant spec requires a scale in [0, 38] and a precision of at most
38.
+ private static BigDecimal toVariantDecimal(BigDecimal d) {
+ BigDecimal result = d;
+ if (d.scale() < 0) {
+ // A non-zero value with a scale below -38 has more than 38 digits
after rescaling.
+ // Reject it upfront because setScale is expensive for huge
exponents like 1e999999999.
+ if (d.signum() != 0 && d.scale() < -MAX_DECIMAL16_PRECISION) {
+ throw decimalOutOfRange(d);
+ }
+ result = d.setScale(0);
Review Comment:
Just add a one line of comment on top and say that for for a negative scale
the result is precision - scale. So in the case of `12345e34` is 5 - (-34) =
39.
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