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Mingyu Chen 67b842ce04 [License] Organize and modify the license of the code (#4371) 
1. Disable the MySQL client and LZO library by default when building the Doris.

    MySQL client library is used for MySQL external table feature.
    This feature will be replaced by the new ODBC external table soon.

    LZO library is used to compress/decompress data of some old data format of Doris,
    which is no longer used anymore.

2. Add missing license to some files.

3. For all non-Apache-License code, all are explained in NOTICE file and the corresponding license is declared.

4. Remove the js source code from webroot, it will be downloaded as thirdparty
2020-08-24 21:51:55 +08:00
..
conf
[License] Organize and modify the license of the code (#4371)
2020-08-24 21:51:55 +08:00
convert_row_to_column.py
Transform row-oriented table to columnar-oriented table (#311)
2018-11-16 16:03:56 +08:00
get_ddl_stmt.py
Transform row-oriented table to columnar-oriented table (#311)
2018-11-16 16:03:56 +08:00
README.md
[License] Organize and modify the license of the code (#4371)
2020-08-24 21:51:55 +08:00

README.md

Steps of row-to-column conversion:

  1. Modify the corresponding cluster configuration in conf.

  2. Run python convert_row_to_column.py to generate all row storage to column storage commands.

  3. If the script runs without any results, it means that there is no row storage table in the cluster, so nothing need to be done.

  4. If there is a table in the script that fails to obtain information.

    Please use show create table in the cluster to see the storage_type of the table. If it is row storage, please manually convert it.

  5. After the schema change is completed, the old schema needs to be deleted after 10 minutes.

    Please wait for a while to make sure that the data of the old schema has been deleted, and then upgrade. Otherwise, the BE process will exit with an error when it is automatically detected when it starts.

  6. Run python convert_row_to_column.py again to verify that there are no rows in the table before upgrading.