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Add support to alter table comment

See original GitHub issue

I looking for a way to change the table comment. You can create a table with a comment

CREATE TABLE prod.db.sample (
    id bigint COMMENT 'unique id',
    data string)
USING iceberg

You can alter the comment of a column

ALTER TABLE prod.db.sample ALTER COLUMN measurement COMMENT 'unit is kilobytes per second'

But there does not appear to be a way to alter the tables comment.

Issue Analytics

State:
Created a year ago
Comments:7 (3 by maintainers)

Top GitHub Comments

1reaction

felixYyucommented, Apr 27, 2022

I will open a PR to add this to the Spark docs. @kbendick

0reactions

felixYyucommented, Apr 27, 2022

ALTER TABLE hadoop_prod.default.test_evolution7 SET TBLPROPERTIES (‘comment’ = ‘A table comment.’)

ALTER TABLE hadoop_prod.default.test_evolution7 ALTER COLUMN point COMMENT “new comment”

the syntax of Spark sql can work @kbendick . show DDL detail following:

+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|createtab_stmt                                                                                                                                                                                                                                                                                                                                                                                                                        |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
|CREATE TABLE hadoop_prod.default.test_evolution7 (\n  `col0` BIGINT,\n  `col10` BIGINT,\n  `point` STRUCT<`x`: DOUBLE, `y`: DOUBLE> COMMENT 'new comment')\nUSING iceberg\nCOMMENT 'A table comment.'\nLOCATION 'file:///D:/lake-iceberg/warehouse/default/test_evolution7'\nTBLPROPERTIES(\n  'current-snapshot-id' = 'none',\n  'format' = 'iceberg/parquet',\n  'format-version' = '1',\n  'write.delete.mode' = 'merge-on-read')\n|
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+