Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/231#discussion_r22339025
--- Diff:
tajo-catalog/tajo-catalog-common/src/main/java/org/apache/tajo/catalog/CatalogUtil.java
---
@@ -868,4 +865,43 @@ public static KeyValueSet
newPhysicalProperties(StoreType type) {
return options;
}
+
+ /**
+ * Make a unique name by concatenating column names.
+ * The concatenation is performed in sequence of columns' occurrence in
the relation schema.
+ *
+ * @param originalSchema original relation schema
+ * @param columnNames column names which will be unified
+ * @return unified name
+ */
+ public static String getUnifiedSimpleColumnName(Schema originalSchema,
String[] columnNames) {
--- End diff --
The value ```originalSchema``` is a schema of a relation. I think that we
should guarantee that every column name is unique in a relation.
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