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Posted to github@arrow.apache.org by "waitingkuo (via GitHub)" <gi...@apache.org> on 2023/02/02 09:22:04 UTC
[GitHub] [arrow-datafusion] waitingkuo commented on a diff in pull request #5140: Date to Timestamp cast
waitingkuo commented on code in PR #5140:
URL: https://github.com/apache/arrow-datafusion/pull/5140#discussion_r1094229758
##########
datafusion/expr/src/type_coercion/binary.rs:
##########
@@ -541,33 +541,30 @@ fn is_time_with_valid_unit(datatype: DataType) -> bool {
fn temporal_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataType> {
use arrow::datatypes::DataType::*;
match (lhs_type, rhs_type) {
- (Date64, Date32) => Some(Date64),
- (Date32, Date64) => Some(Date64),
- (Utf8, Date32) => Some(Date32),
- (Date32, Utf8) => Some(Date32),
- (Utf8, Date64) => Some(Date64),
- (Date64, Utf8) => Some(Date64),
- (Utf8, Time32(unit)) => match is_time_with_valid_unit(Time32(unit.clone())) {
- false => None,
- true => Some(Time32(unit.clone())),
- },
- (Time32(unit), Utf8) => match is_time_with_valid_unit(Time32(unit.clone())) {
- false => None,
- true => Some(Time32(unit.clone())),
- },
- (Utf8, Time64(unit)) => match is_time_with_valid_unit(Time64(unit.clone())) {
- false => None,
- true => Some(Time64(unit.clone())),
- },
- (Time64(unit), Utf8) => match is_time_with_valid_unit(Time64(unit.clone())) {
- false => None,
- true => Some(Time64(unit.clone())),
- },
- (Timestamp(_, tz), Utf8) => Some(Timestamp(TimeUnit::Nanosecond, tz.clone())),
- (Utf8, Timestamp(_, tz)) => Some(Timestamp(TimeUnit::Nanosecond, tz.clone())),
- // TODO: need to investigate the result type for the comparison between timestamp and date
- (Timestamp(_, _), Date32) => Some(Date32),
- (Timestamp(_, _), Date64) => Some(Date64),
+ (Date64, Date32) | (Date32, Date64) => Some(Date64),
+ (Utf8, Date32) | (Date32, Utf8) => Some(Date32),
+ (Utf8, Date64) | (Date64, Utf8) => Some(Date64),
+ (Utf8, Time32(unit)) | (Time32(unit), Utf8) => {
+ match is_time_with_valid_unit(Time32(unit.clone())) {
+ false => None,
+ true => Some(Time32(unit.clone())),
+ }
+ }
+ (Utf8, Time64(unit)) | (Time64(unit), Utf8) => {
+ match is_time_with_valid_unit(Time64(unit.clone())) {
+ false => None,
+ true => Some(Time64(unit.clone())),
+ }
+ }
+ (Timestamp(_, tz), Utf8) | (Utf8, Timestamp(_, tz)) => {
+ Some(Timestamp(TimeUnit::Nanosecond, tz.clone()))
+ }
+ (Timestamp(_, None), Date32) | (Date32, Timestamp(_, None)) => {
+ Some(Timestamp(TimeUnit::Nanosecond, None))
+ }
+ (Timestamp(_, _tz), Date32) | (Date32, Timestamp(_, _tz)) => {
+ Some(Timestamp(TimeUnit::Nanosecond, None))
+ }
Review Comment:
does it mean that we convert Timestamptz to Timestamp and then compare?
##########
datafusion/expr/src/type_coercion/binary.rs:
##########
@@ -541,33 +541,30 @@ fn is_time_with_valid_unit(datatype: DataType) -> bool {
fn temporal_coercion(lhs_type: &DataType, rhs_type: &DataType) -> Option<DataType> {
use arrow::datatypes::DataType::*;
match (lhs_type, rhs_type) {
- (Date64, Date32) => Some(Date64),
- (Date32, Date64) => Some(Date64),
- (Utf8, Date32) => Some(Date32),
- (Date32, Utf8) => Some(Date32),
- (Utf8, Date64) => Some(Date64),
- (Date64, Utf8) => Some(Date64),
- (Utf8, Time32(unit)) => match is_time_with_valid_unit(Time32(unit.clone())) {
- false => None,
- true => Some(Time32(unit.clone())),
- },
- (Time32(unit), Utf8) => match is_time_with_valid_unit(Time32(unit.clone())) {
- false => None,
- true => Some(Time32(unit.clone())),
- },
- (Utf8, Time64(unit)) => match is_time_with_valid_unit(Time64(unit.clone())) {
- false => None,
- true => Some(Time64(unit.clone())),
- },
- (Time64(unit), Utf8) => match is_time_with_valid_unit(Time64(unit.clone())) {
- false => None,
- true => Some(Time64(unit.clone())),
- },
- (Timestamp(_, tz), Utf8) => Some(Timestamp(TimeUnit::Nanosecond, tz.clone())),
- (Utf8, Timestamp(_, tz)) => Some(Timestamp(TimeUnit::Nanosecond, tz.clone())),
- // TODO: need to investigate the result type for the comparison between timestamp and date
- (Timestamp(_, _), Date32) => Some(Date32),
- (Timestamp(_, _), Date64) => Some(Date64),
+ (Date64, Date32) | (Date32, Date64) => Some(Date64),
+ (Utf8, Date32) | (Date32, Utf8) => Some(Date32),
+ (Utf8, Date64) | (Date64, Utf8) => Some(Date64),
+ (Utf8, Time32(unit)) | (Time32(unit), Utf8) => {
+ match is_time_with_valid_unit(Time32(unit.clone())) {
+ false => None,
+ true => Some(Time32(unit.clone())),
+ }
+ }
+ (Utf8, Time64(unit)) | (Time64(unit), Utf8) => {
+ match is_time_with_valid_unit(Time64(unit.clone())) {
+ false => None,
+ true => Some(Time64(unit.clone())),
+ }
+ }
+ (Timestamp(_, tz), Utf8) | (Utf8, Timestamp(_, tz)) => {
+ Some(Timestamp(TimeUnit::Nanosecond, tz.clone()))
+ }
Review Comment:
i tried this, but it didn't work
```bash
❯ select '2000-01-01T00:00:00'::timestamp::timestamptz = '2000-01-01T00:00:00';
Internal("The type of Timestamp(Nanosecond, Some(\"+00:00\")) Eq Utf8 of binary physical should be same")
```
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