korlov42 commented on a change in pull request #201:
URL: https://github.com/apache/ignite-3/pull/201#discussion_r672154448
##########
File path:
modules/schema/src/main/java/org/apache/ignite/internal/schema/mapping/ColumnMapper.java
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@@ -30,4 +31,12 @@
* @return Column index in target schema or {@code -1} if no column exists
in target schema.
*/
int map(int idx);
+
+ /**
+ * Column descriptor for given column idx.
+ *
+ * @param idx Column index in source schema.
+ * @return Column descriptor.
+ */
+ Column mappedColumn(int idx);
Review comment:
let's denote a return type as `@Nullable`
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