jonahgao commented on code in PR #13741:
URL: https://github.com/apache/datafusion/pull/13741#discussion_r1885119711
##########
datafusion/expr/src/expr_schema.rs:
##########
@@ -453,6 +455,26 @@ impl ExprSchemable for Expr {
}
_ => Ok(Expr::Cast(Cast::new(Box::new(self),
cast_to_type.clone()))),
}
+ } else if matches!(
+ (&this_type, cast_to_type),
+ (DataType::Int32 | DataType::Int64, DataType::Interval(_))
+ ) {
+ // Convert integer (days) to the corresponding DayTime interval
+ match self {
+ Expr::Literal(ScalarValue::Int32(Some(days))) => {
+ Ok(Expr::Literal(ScalarValue::IntervalDayTime(Some(
+ arrow_buffer::IntervalDayTime::new(days, 0),
+ ))))
+ }
+ Expr::Literal(ScalarValue::Int64(Some(days))) => {
+ Ok(Expr::Literal(ScalarValue::IntervalDayTime(Some(
+ arrow_buffer::IntervalDayTime::new(days as i32, 0),
+ ))))
+ }
+ _ => plan_err!(
+ "Cannot automatically convert {this_type:?} to
{cast_to_type:?}"
+ ),
+ }
Review Comment:
Perhaps we require a new scalar function, `make_interval`, which can convert
integers into intervals.
Then, similar to
[`make_array`](https://github.com/apache/datafusion/blob/bfabd48de2e0deccbd8ce595936ad24f18baca65/datafusion/functions-nested/src/planner.rs#L101),
perform transformations within the SQL planner.
Transform `4 + to_date('1970-01-03')` to `make_interval(4) +
to_date('1970-01-03')` inside `plan_binary_op`
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