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Set adjusted to UTC if UTC timezone (#1932) #1937

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merged 1 commit into from Jun 24, 2022
Merged

Set adjusted to UTC if UTC timezone (#1932) #1937

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39 changes: 37 additions & 2 deletions parquet/src/arrow/schema.rs
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Expand Up @@ -300,10 +300,15 @@ fn arrow_to_parquet_type(field: &Field) -> Result<Type> {
.with_repetition(repetition)
.build()
}
DataType::Timestamp(time_unit, _) => {
DataType::Timestamp(time_unit, tz) => {
let is_utc = tz
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I initially played around with using chrono-tz, but this is a non-trivial additional dependency, and does not appear to be being actively maintained. I think this should be good enough, until such a time as we potentially add coerce types functionality as part of #1666

.as_ref()
.map(|tz| tz == "UTC" || tz == "+00:00" || tz == "-00:00")
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Technically GMT is the timezone - https://www.timeanddate.com/time/gmt-utc-time.html
Should GMT be added in the checks too ?

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I think I would rather keep this small and simple, rather than cover all timezones that happen to be equivalent. Longer term this may be handled as part of #1938

.unwrap_or(false);

Type::primitive_type_builder(name, PhysicalType::INT64)
.with_logical_type(Some(LogicalType::Timestamp {
is_adjusted_to_u_t_c: false,
is_adjusted_to_u_t_c: is_utc,
unit: match time_unit {
TimeUnit::Second => unreachable!(),
TimeUnit::Millisecond => {
Expand Down Expand Up @@ -1281,6 +1286,11 @@ mod tests {
OPTIONAL INT64 time_micro (TIME_MICROS);
OPTIONAL INT64 ts_milli (TIMESTAMP_MILLIS);
REQUIRED INT64 ts_micro (TIMESTAMP(MICROS,false));
REQUIRED INT64 ts_seconds;
REQUIRED INT64 ts_micro_utc (TIMESTAMP(MICROS, true));
REQUIRED INT64 ts_millis_zero_offset (TIMESTAMP(MILLIS, true));
REQUIRED INT64 ts_millis_zero_negative_offset (TIMESTAMP(MILLIS, true));
REQUIRED INT64 ts_micro_non_utc (TIMESTAMP(MICROS, false));
REQUIRED GROUP struct {
REQUIRED BOOLEAN bools;
REQUIRED INT32 uint32 (INTEGER(32,false));
Expand Down Expand Up @@ -1329,6 +1339,31 @@ mod tests {
DataType::Timestamp(TimeUnit::Microsecond, None),
false,
),
Field::new(
"ts_seconds",
DataType::Timestamp(TimeUnit::Second, Some("UTC".to_string())),
false,
),
Field::new(
"ts_micro_utc",
DataType::Timestamp(TimeUnit::Microsecond, Some("UTC".to_string())),
false,
),
Field::new(
"ts_millis_zero_offset",
DataType::Timestamp(TimeUnit::Millisecond, Some("+00:00".to_string())),
false,
),
Field::new(
"ts_millis_zero_negative_offset",
DataType::Timestamp(TimeUnit::Millisecond, Some("-00:00".to_string())),
false,
),
Field::new(
"ts_micro_non_utc",
DataType::Timestamp(TimeUnit::Microsecond, Some("+01:00".to_string())),
false,
),
Field::new(
"struct",
DataType::Struct(vec![
Expand Down