gokselk commented on code in PR #19663:
URL: https://github.com/apache/datafusion/pull/19663#discussion_r2671605069
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datafusion/functions/src/datetime/to_timestamp.rs:
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@@ -325,6 +327,75 @@ impl_to_timestamp_constructors!(ToTimestampMillisFunc);
impl_to_timestamp_constructors!(ToTimestampMicrosFunc);
impl_to_timestamp_constructors!(ToTimestampNanosFunc);
+fn decimal_to_nanoseconds(value: i128, scale: i8) -> i64 {
Review Comment:
rescale_decimal preserves logical value, doesn't multiply. I think we'd
still need to compute 10^(9-scale).
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