hequn8128 commented on a change in pull request #8057: [FLINK-12028][table] Add
`addColumns`,`renameColumns`, `dropColumns` …
URL: https://github.com/apache/flink/pull/8057#discussion_r269861768
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File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Table.java
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@@ -879,4 +879,117 @@
* @return An OverWindowedTable to specify the aggregations.
*/
OverWindowedTable window(OverWindow... overWindows);
+
+ /**
+ * Performs a field add operation. Similar to an SQL SELECT statement.
The field expressions
+ * can contain complex expressions, but can not be an aggregations.
Will report an expression if
+ * the added field name already exists.
+ *
+ * <p>Example:
+ * <pre>
+ * {@code
+ * tab.addColumns("a + 1 as a1, concat(b, 'sunny') as b1")
+ * }
+ * </pre>
+ */
+ Table addColumns(String fields);
+
+ /**
+ * Performs a field add operation. Similar to an SQL SELECT statement.
The field expressions
+ * can contain complex expressions, but can not be an aggregations.
Will report an expression if
Review comment:
- an aggregations. ditto.
- expression => exception
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