colinmarc commented on code in PR #3574:
URL: https://github.com/apache/iceberg-rust/pull/3574#discussion_r4441413122
##########
crates/iceberg/src/spec/values/datum.rs:
##########
@@ -1312,3 +1306,104 @@ fn human_float<T: Float + LowerExp + FromStr>(value: T)
-> String {
format!("{sign}{}.{fraction}E{exponent}", &digits[..1])
}
}
+
+const MICROS_PER_DAY: i64 = 24 * 60 * 60 * 1_000_000;
+const NANOS_PER_MICRO: i64 = 1000;
+const NANOS_PER_DAY: i64 = NANOS_PER_MICRO * MICROS_PER_DAY;
+
+/// Converts an int literal between two [PrimitiveType]s.
+fn convert_int(
+ val: i32,
+ source_type: &PrimitiveType,
+ target_type: &PrimitiveType,
+) -> Result<Datum> {
+ let datum = match (source_type, target_type) {
+ (_, PrimitiveType::Int) => Datum::int(val),
+ (_, PrimitiveType::Date) => Datum::date(val),
+ (_, PrimitiveType::Long) => Datum::long(val),
+ (PrimitiveType::Date, PrimitiveType::Timestamp) =>
Datum::timestamp_micros(
+ (val as i64)
+ .checked_mul(MICROS_PER_DAY)
+ .ok_or_else(overflow)?,
+ ),
+ (PrimitiveType::Date, PrimitiveType::Timestamptz) =>
Datum::timestamptz_micros(
+ (val as i64)
+ .checked_mul(MICROS_PER_DAY)
+ .ok_or_else(overflow)?,
+ ),
+ (PrimitiveType::Date, PrimitiveType::TimestampNs) =>
Datum::timestamp_nanos(
+ (val as i64)
+ .checked_mul(NANOS_PER_DAY)
+ .ok_or_else(overflow)?,
+ ),
+ (PrimitiveType::Date, PrimitiveType::TimestamptzNs) =>
Datum::timestamptz_nanos(
+ (val as i64)
+ .checked_mul(NANOS_PER_DAY)
+ .ok_or_else(overflow)?,
+ ),
+ _ => {
+ return Err(invalid_data!(
+ "Can't convert datum from {source_type} type to {target_type}
type."
+ ));
+ }
+ };
+
+ Ok(datum)
+}
+
+/// Converts a long literal between two [PrimitiveType]s.
+fn convert_long(
+ val: i64,
+ source_type: &PrimitiveType,
+ target_type: &PrimitiveType,
+) -> Result<Datum> {
+ let datum = match (source_type, target_type) {
+ (_, PrimitiveType::Int) => Datum::i64_to_i32(val),
+ (_, PrimitiveType::Long) => Datum::long(val),
+ (
+ PrimitiveType::Long | PrimitiveType::Timestamp |
PrimitiveType::Timestamptz,
+ PrimitiveType::Timestamp,
+ ) => Datum::timestamp_micros(val),
+ (
+ PrimitiveType::Long | PrimitiveType::Timestamp |
PrimitiveType::Timestamptz,
+ PrimitiveType::Timestamptz,
+ ) => Datum::timestamptz_micros(val),
+ (
+ PrimitiveType::Long | PrimitiveType::TimestampNs |
PrimitiveType::TimestamptzNs,
+ PrimitiveType::TimestampNs,
+ ) => Datum::timestamp_nanos(val),
+ (
+ PrimitiveType::Long | PrimitiveType::TimestampNs |
PrimitiveType::TimestamptzNs,
+ PrimitiveType::TimestamptzNs,
+ ) => Datum::timestamptz_nanos(val),
+ (PrimitiveType::TimestampNs | PrimitiveType::TimestamptzNs,
PrimitiveType::Timestamp) => {
+ Datum::timestamp_micros(val.div_euclid(NANOS_PER_MICRO))
+ }
+ (PrimitiveType::TimestampNs | PrimitiveType::TimestamptzNs,
PrimitiveType::Timestamptz) => {
+ Datum::timestamptz_micros(val.div_euclid(NANOS_PER_MICRO))
+ }
+ (PrimitiveType::Timestamp | PrimitiveType::Timestamptz,
PrimitiveType::TimestampNs) => {
+
Datum::timestamp_nanos(val.checked_mul(NANOS_PER_MICRO).ok_or_else(overflow)?)
+ }
+ (PrimitiveType::Timestamp | PrimitiveType::Timestamptz,
PrimitiveType::TimestamptzNs) => {
+
Datum::timestamptz_nanos(val.checked_mul(NANOS_PER_MICRO).ok_or_else(overflow)?)
+ }
+ (PrimitiveType::Timestamp | PrimitiveType::Timestamptz,
PrimitiveType::Date) => {
+ Datum::date(val.div_euclid(MICROS_PER_DAY) as i32)
+ }
+ (PrimitiveType::TimestampNs | PrimitiveType::TimestamptzNs,
PrimitiveType::Date) => {
+ Datum::date(val.div_euclid(NANOS_PER_DAY) as i32)
+ }
Review Comment:
As a recap:
- I dropped every conversion that would *add* a timezone (eg `timestamp` ->
`timestamptz`)
- I kept the conversions that drop a timezone (eg `timestamptz` ->
`timestamp`), since that seems ok per the spec?
- I dropped every conversion that loses precision by flooring
(`timestampns` -> `timestamp`).
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