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_r269861806
##########
File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/Table.java
##########
@@ -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
+ * the added field name already exists.
+ *
+ * <p>Scala Example:
+ *
+ * <pre>
+ * {@code
+ * tab.addColumns('a + 1 as 'a1, concat('b, "sunny") as 'b1)
+ * }
+ * </pre>
+ */
+ Table addColumns(Expression... 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.
Existing fields will be
+ * replaced if {@code replaceIfExist} is true.
+ *
+ * <p>Example:
+ * <pre>
+ * {@code
+ * tab.addColumns(true, "a + 1 as a1, concat(b, 'sunny') as b1")
+ * }
+ * </pre>
+ */
+ Table addColumns(boolean replaceIfExist, 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.
Existing fields will be
+ * replaced if {@code replaceIfExist} is true.
+ *
+ * <p>Scala Example:
+ * <pre>
+ * {@code
+ * tab.addColumns(true, 'a + 1 as 'a1, concat('b, "sunny") as 'b1)
+ * }
+ * </pre>
+ */
+ Table addColumns(boolean replaceIfExist, Expression... fields);
+
+ /**
+ * Performs a field rename operation. Similar to an field alias
statement. The field expressions
+ * should be an alias expressions, and only the existing fields can be
renamed.
+ *
+ * <p>Example:
+ *
+ * <pre>
+ * {@code
+ * tab.renameColumns("a as a1, b as b1")
+ * }
+ * </pre>
+ */
+ Table renameColumns(String fields);
+
+ /**
+ * Performs a field rename operation. Similar to an field alias
statement. The field expressions
+ * should be an alias expressions, and only the existing fields can be
renamed.
+ *
+ * <p>Scala Example:
+ *
+ * <pre>
+ * {@code
+ * tab.renameColumns('a as 'a1, 'b as 'b2)
+ * }
+ * </pre>
+ */
+ Table renameColumns(Expression... fields);
+
+ /**
+ * Performs a field drop operation. The field expressions
+ * should be an field reference expressions, and only the existing
fields can be drop.
+ *
+ * <p>Example:
+ *
+ * <pre>
+ * {@code
+ * tab.dropColumns("a, b")
+ * }
+ * </pre>
+ */
+ Table dropColumns(String fields);
+
+ /**
+ * Performs a field drop operation. The field expressions
+ * should be an field reference expressions, and only the existing
fields can be drop.
+ *
+ * <p>Scala Example:
+ * <pre>
+ * {@code
+ * tab.dropColumns('a, 'b)
+ * }
+ * </pre>
+ */
+ Table dropColumns(Expression... fields);
+
Review comment:
remove the empty line?
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