[GitHub] [arrow-datafusion] alamb commented on a diff in pull request #2680: chore: default precision and scale for cast decimal

[GitBox <gi...@apache.org>]

alamb commented on code in PR #2680:
URL: https://github.com/apache/arrow-datafusion/pull/2680#discussion_r888365223


##########
datafusion/sql/src/utils.rs:
##########
@@ -447,24 +447,16 @@ 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
-            if (p as usize) > DECIMAL_MAX_PRECISION || s > p {
-                return Err(DataFusionError::Internal(format!(
-                    "For decimal(precision, scale) precision must be less than or equal to 38 and scale can't be greater than precision. Got ({}, {})",
-                    p, s
-                )));
-            } else {
-                Ok(DataType::Decimal(p as usize, s as usize))
-            }
-        }
+    let scale = scale.unwrap_or(DECIMAL_DEFAULT_SCALE as u64) as usize;

Review Comment:
   cc @liukun4515 



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