liukun4515 commented on a change in pull request #1394:
URL: https://github.com/apache/arrow-datafusion/pull/1394#discussion_r762516424



##########
File path: datafusion/src/scalar.rs
##########
@@ -453,6 +477,26 @@ macro_rules! eq_array_primitive {
 }
 
 impl ScalarValue {
+    /// Create a decimal Scalar from value/precision and scale.
+    pub fn try_new_decimal128(
+        value: i128,
+        precision: usize,
+        scale: usize,
+    ) -> Result<Self> {
+        // make sure the precision and scale is valid
+        // TODO const the max precision and min scale

Review comment:
       > 
   
   Yes, now in the arrow-rs the decimal256 has not been implemented.
   In the arrow-go, it is also not implemented too.
   Just in the arrow-java and arrow-c++, the bitwith of 256 has been 
implemented.
   @capkurmagati 




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