commit | 5e817967941eb6bed0432835f317549dd458647b | [log] [tgz] |
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author | haomarch <marchpure@126.com> | Mon Sep 28 15:04:20 2020 +0800 |
committer | kunal642 <kunalkapoor642@gmail.com> | Tue Sep 29 23:09:05 2020 +0530 |
tree | 77f8e58b3ac7828ecbebf10c9d187c6419b7339b | |
parent | 8d0fc277b064776321c14088019a79d330b89e82 [diff] |
[CARBONDATA-4014] Support Change Column Comment Why is this PR needed? Now, we support add column comment in "CREATE TABLE" and "ADD COLUMN". but do not support alter comment of the column, which shall be support in 'CHANGE COLUMN' What changes were proposed in this PR? Support "ALTER TABLE table_name CHANGE [COLUMN] col_name col_name data_type [COMMENT col_comment]" Does this PR introduce any user interface change? Yes. add CHANGE COLUMN explaination in the ddl document. Is any new testcase added? Yes This closes #3960
Apache CarbonData is an indexed columnar data store solution for fast analytics on big data platform, e.g.Apache Hadoop, Apache Spark, etc.
You can find the latest CarbonData document and learn more at: http://carbondata.apache.org
CarbonData file format is a columnar store in HDFS, it has many features that a modern columnar format has, such as splittable, compression schema ,complex data type etc, and CarbonData has following unique features:
CarbonData is built using Apache Maven, to build CarbonData
Some features are marked as experimental because the syntax/implementation might change in the future.
This is an active open source project for everyone, and we are always open to people who want to use this system or contribute to it. This guide document introduce how to contribute to CarbonData.
To get involved in CarbonData:
Apache CarbonData is an open source project of The Apache Software Foundation (ASF).