danny0405 commented on code in PR #2844:
URL: https://github.com/apache/calcite/pull/2844#discussion_r913732009
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core/src/main/java/org/apache/calcite/sql/SqlTableFunction.java:
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@@ -30,4 +32,17 @@ public interface SqlTableFunction {
* @return strategy to infer the row type of a call to this function
*/
SqlReturnTypeInference getRowTypeInference();
+
+ /**
+ * Returns the table parameter characteristics for <code>ordinal</code>th
+ * parameter to this table function.
+ *
+ * <p>Returns <code>null</code> if the <code>ordinal</code>th argument is
+ * not table parameter or the <code>ordinal</code> is smaller than 0 or
+ * the <code>ordinal</code> is greater than or equals to the number of
+ * parameters.
+ */
+ default @Nullable TableCharacteristic tableCharacteristic(int ordinal) {
+ return null;
Review Comment:
Seems the functionality is only supported by window function ? Then moving
this interface to `SqlWindowTableFunction` is more proper way.
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