feat: add standard deviation functions (#257)

substrait-io · Jul 28, 2022 · 1339534 · 1339534
1 parent 34ec8f5
commit 1339534
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Showing 2 changed files with 18 additions and 1 deletion.
diff --git a/extensions/functions_arithmetic.yaml b/extensions/functions_arithmetic.yaml
@@ -694,6 +694,23 @@ aggregate_functions:
         decomposable: MANY
         intermediate: fp64
         return: fp64
+  - name: "std_dev"
+    description: Calculates standard-deviation for a set of values.
+    impls:
+      - args:
+          - name: rounding
+            options: [ TIE_TO_EVEN, TIE_AWAY_FROM_ZERO, TRUNCATE, CEILING, FLOOR ]
+            required: false
+          - value: fp32
+        nullability: DECLARED_OUTPUT
+        return: fp32?
+      - args:
+          - name: rounding
+            options: [ TIE_TO_EVEN, TIE_AWAY_FROM_ZERO, TRUNCATE, CEILING, FLOOR ]
+            required: false
+          - value: fp64
+        nullability: DECLARED_OUTPUT
+        return: fp64?
 window_functions:
   - name: "row_number"
     description: "the number of the current row within its partition."

diff --git a/text/simple_extensions_schema.yaml b/text/simple_extensions_schema.yaml
@@ -200,7 +200,7 @@ $defs:
         items:
           type: object
           additionalProperties: false
-          required: [ intermediate, return ]
+          required: [ return ]
           properties:
             args:
               $ref: "#/$defs/arguments"