waitingkuo commented on PR #5818:
URL:
https://github.com/apache/arrow-datafusion/pull/5818#issuecomment-1499544976
@Weijun-H
you could do something like this:
```rust
match input_expr_types[0] {
DataType::Timestamp(TimeUnit::Nanosecond, _) =>
Ok(DataType::Timestamp(TimeUnit::Nanosecond, None)),
DataType::Timestamp(TimeUnit::Microsecond, _) =>
Ok(DataType::Timestamp(TimeUnit::Microsecond, None)),
DataType::Timestamp(TimeUnit::Millisecond, _) =>
Ok(DataType::Timestamp(TimeUnit::Millisecond, None)),
DataType::Timestamp(TimeUnit::Second, _) =>
Ok(DataType::Timestamp(TimeUnit::Second, None)),
_ => return Err(DataFusionError::Internal(
"The date_trunc function can only accept timestamp as
the first arg.".to_string(),
))
}
```
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