alamb commented on code in PR #2786:
URL: https://github.com/apache/arrow-datafusion/pull/2786#discussion_r906281699
##########
datafusion/physical-expr/src/datetime_expressions.rs:
##########
@@ -356,8 +360,9 @@ pub fn date_part(args: &[ColumnarValue]) ->
Result<ColumnarValue> {
"hour" => extract_date_part!(array, temporal::hour),
"minute" => extract_date_part!(array, temporal::minute),
"second" => extract_date_part!(array, temporal::second),
+ "epoch" => extract_date_part!(array, extract_epoch),
_ => Err(DataFusionError::Execution(format!(
- "Date part '{}' not supported",
+ "Date partx '{}' not supported",
Review Comment:
```suggestion
"Date part '{}' not supported",
```
##########
datafusion/physical-expr/src/datetime_expressions.rs:
##########
@@ -372,6 +377,40 @@ pub fn date_part(args: &[ColumnarValue]) ->
Result<ColumnarValue> {
})
}
+fn extract_epoch<T>(array: &PrimitiveArray<T>) -> Result<Int32Array>
+where
+ T: ArrowTemporalType + ArrowNumericType,
+ i64: std::convert::From<T::Native>,
+{
+ let mut b = Int32Builder::new(array.len());
+ match array.data_type() {
+ &DataType::Timestamp(ref unit, _) => {
+ for i in 0..array.len() {
+ if array.is_null(i) {
+ b.append_null()?;
+ } else {
+ let scale = match unit {
Review Comment:
I would recommend using the `chrono` functions for this, such as done here:
https://sourcegraph.com/github.com/apache/arrow-rs/-/blob/arrow/src/compute/kernels/temporal.rs?L214-240&subtree=true
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