viirya commented on code in PR #6632:
URL: https://github.com/apache/arrow-datafusion/pull/6632#discussion_r1225918413
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datafusion/expr/src/function.rs:
##########
@@ -221,17 +221,17 @@ pub fn return_type(
BuiltinScalarFunction::Concat => Ok(Utf8),
BuiltinScalarFunction::ConcatWithSeparator => Ok(Utf8),
BuiltinScalarFunction::DatePart => Ok(Float64),
- BuiltinScalarFunction::DateTrunc | BuiltinScalarFunction::DateBin => {
- match input_expr_types[1] {
- Timestamp(Nanosecond, _) | Utf8 => Ok(Timestamp(Nanosecond,
None)),
- Timestamp(Microsecond, _) => Ok(Timestamp(Microsecond, None)),
- Timestamp(Millisecond, _) => Ok(Timestamp(Millisecond, None)),
- Timestamp(Second, _) => Ok(Timestamp(Second, None)),
- _ => Err(DataFusionError::Internal(format!(
- "The {fun} function can only accept timestamp as the
second arg."
- ))),
- }
- }
+ // DateTrunc always makes nanosecond timestamps
+ BuiltinScalarFunction::DateTrunc => Ok(Timestamp(Nanosecond, None)),
Review Comment:
I guess that it is before because the second argument in `DateTrunc`
signature is `Timestamp(Nanosecond, None)`. So it doesn't cause issue before?
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