Weijun-H commented on PR #5818:
URL:
https://github.com/apache/arrow-datafusion/pull/5818#issuecomment-1499640854
> @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(),
> ))
> }
> ```
It seems that we should modify the function signature, like
```
date_trunc('Timestamp(Second, None)', to_timestamp_seconds(61))?
```
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