zhengruifeng commented on code in PR #38653:
URL: https://github.com/apache/spark/pull/38653#discussion_r1022297166
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connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -316,6 +319,36 @@ message StatCrosstab {
string col2 = 3;
}
+// Replaces null values.
+// It will invoke 'Dataset.na.fill' (same as 'DataFrameNaFunctions.fill') to
compute the results.
+// Following 3 parameter combinations are supported:
+// 1, 'values' only contains 1 item, 'cols' is empty:
+// replaces null values in all type-matched columns.
+// 2, 'values' only contains 1 item, 'cols' is not empty:
+// replaces null values in specified columns.
+// 3, 'values' contains more than 1 items, then 'cols' is required to have
the same length:
+// replaces each specified column with corresponding value.
+message NAFill {
+ // (Required) The input relation.
+ Relation input = 1;
+
+ // (Optional) Optional list of column names to consider.
+ repeated string cols = 2;
+
+ // (Required) Values to replace null values with. Should contains at least 1
item.
+ repeated Type values = 3;
+
+ // Available data types.
+ message Type {
Review Comment:
I think this is the first method that only support several datatype.
> Could we probably use Literal to ship these values?
the question is do we need to limit the datatypes in proto message?
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