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Subject [GitHub] [flink] hequn8128 commented on a change in pull request #8057: [FLINK-12028][table] Add `addColumns`,`renameColumns`, `dropColumns` …
Date Thu, 28 Mar 2019 05:33:55 GMT
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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