liukun4515 commented on a change in pull request #1525:
URL: https://github.com/apache/arrow-datafusion/pull/1525#discussion_r780097748
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File path: datafusion/src/physical_plan/expressions/mod.rs
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@@ -84,9 +86,13 @@ pub use nth_value::NthValue;
pub use nullif::{nullif_func, SUPPORTED_NULLIF_TYPES};
pub use rank::{dense_rank, percent_rank, rank};
pub use row_number::RowNumber;
+pub(crate) use stddev::is_stddev_support_arg_type;
+pub use stddev::{stddev_return_type, Stddev};
Review comment:
Do we need to public `stddev_return_type` and `Stddev` as a lib function?
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