fix(description): updating approximation description

substrait-io · Sep 6, 2022 · 4464d1b · 4464d1b
1 parent 05bade7
commit 4464d1b
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/extensions/functions_arithmetic.yaml b/extensions/functions_arithmetic.yaml
@@ -1309,10 +1309,14 @@ aggregate_functions:
             description: >
               Based on required operator performance and configured optimizations
               on saving memory bandwidth, the precision of the end result can be
-              the highest possible accuracy of an approximation. 
+              the highest possible accuracy or an approximation.
 
-                - EXACT: provides the highest accurate output
-                - APPROXIMATE: provides a sub-optimal output
+                - EXACT: provides the exact result, rounded if needed according
+                  to the rounding option.
+                - APPROXIMATE: provides only an estimate; the result must lie
+                  between the minimum and maximum values in the input
+                  (inclusive), but otherwise the accuracy is left up to the
+                  consumer.
             options: [ EXACT, APPROXIMATE ]
             required: true
           - name: rounding