liukun4515 commented on a change in pull request #1438:
URL: https://github.com/apache/arrow-datafusion/pull/1438#discussion_r767357853
##########
File path: datafusion/src/sql/utils.rs
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@@ -503,6 +505,33 @@ pub(crate) fn group_window_expr_by_sort_keys(
Ok(result)
}
+/// Returns a validated `DataType` for the specified precision and
+/// scale
+pub(crate) fn make_decimal_type(
+ precision: Option<u64>,
+ scale: Option<u64>,
+) -> Result<DataType> {
+ match (precision, scale) {
+ (None, _) | (_, None) => {
+ return Err(DataFusionError::Internal(format!(
+ "Decimal(precision, scale) must both be specified, got ({:?},
{:?})",
+ precision, scale
+ )));
+ }
+ (Some(p), Some(s)) => {
+ // Arrow decimal is i128 meaning 38 maximum decimal digits
Review comment:
good
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