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Support for extract(epoch from date) for Date32 and Date64 #8695

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merged 1 commit into from
Jan 2, 2024
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Support for extract(epoch from date) for Date32 and Date64 #8695

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34 changes: 34 additions & 0 deletions datafusion/core/tests/sql/expr.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -741,6 +741,7 @@ async fn test_extract_date_part() -> Result<()> {

#[tokio::test]
async fn test_extract_epoch() -> Result<()> {
// timestamp
test_expression!(
"extract(epoch from '1870-01-01T07:29:10.256'::timestamp)",
"-3155646649.744"
Expand All @@ -754,6 +755,39 @@ async fn test_extract_epoch() -> Result<()> {
"946684800.0"
);
test_expression!("extract(epoch from NULL::timestamp)", "NULL");
// date
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👍 I double checked this is consistent with postgres:

postgres=# select extract(epoch from '1970-01-01'::date);
 extract
---------
       0
(1 row)

postgres=# select extract(epoch from '1970-01-02'::date);
 extract
---------
   86400
(1 row)

postgres=# select extract(epoch from '1969-12-31'::date);
 extract
---------
  -86400
(1 row)

test_expression!(
"extract(epoch from arrow_cast('1970-01-01', 'Date32'))",
"0.0"
);
test_expression!(
"extract(epoch from arrow_cast('1970-01-02', 'Date32'))",
"86400.0"
);
test_expression!(
"extract(epoch from arrow_cast('1970-01-11', 'Date32'))",
"864000.0"
);
test_expression!(
"extract(epoch from arrow_cast('1969-12-31', 'Date32'))",
"-86400.0"
);
test_expression!(
"extract(epoch from arrow_cast('1970-01-01', 'Date64'))",
"0.0"
);
test_expression!(
"extract(epoch from arrow_cast('1970-01-02', 'Date64'))",
"86400.0"
);
test_expression!(
"extract(epoch from arrow_cast('1970-01-11', 'Date64'))",
"864000.0"
);
test_expression!(
"extract(epoch from arrow_cast('1969-12-31', 'Date64'))",
"-86400.0"
);
Ok(())
}

Expand Down
44 changes: 24 additions & 20 deletions datafusion/physical-expr/src/datetime_expressions.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,6 @@

use crate::datetime_expressions;
use crate::expressions::cast_column;
use arrow::array::Float64Builder;
use arrow::compute::cast;
use arrow::{
array::{Array, ArrayRef, Float64Array, OffsetSizeTrait, PrimitiveArray},
Expand Down Expand Up @@ -887,28 +886,33 @@ where
T: ArrowTemporalType + ArrowNumericType,
i64: From<T::Native>,
{
let mut b = Float64Builder::with_capacity(array.len());
match array.data_type() {
let b = match array.data_type() {
DataType::Timestamp(tu, _) => {
for i in 0..array.len() {
if array.is_null(i) {
b.append_null();
} else {
let scale = match tu {
TimeUnit::Second => 1,
TimeUnit::Millisecond => 1_000,
TimeUnit::Microsecond => 1_000_000,
TimeUnit::Nanosecond => 1_000_000_000,
};

let n: i64 = array.value(i).into();
b.append_value(n as f64 / scale as f64);
}
}
let scale = match tu {
TimeUnit::Second => 1,
TimeUnit::Millisecond => 1_000,
TimeUnit::Microsecond => 1_000_000,
TimeUnit::Nanosecond => 1_000_000_000,
} as f64;
array.unary(|n| {
let n: i64 = n.into();
n as f64 / scale
})
}
DataType::Date32 => {
let seconds_in_a_day = 86400_f64;
array.unary(|n| {
let n: i64 = n.into();
n as f64 * seconds_in_a_day
})
}
DataType::Date64 => array.unary(|n| {
let n: i64 = n.into();
n as f64 / 1_000_f64
}),
_ => return internal_err!("Can not convert {:?} to epoch", array.data_type()),
}
Ok(b.finish())
};
Ok(b)
}

/// to_timestammp() SQL function implementation
Expand Down