[HUDI-6926] Disable DROP_PARTITION_COLUMNS when upsert MOR table

[wecharyu]

Change Logs

When merge the log files for MOR table, it can not generate partition values if we drop partition columns while upsert data. As a result, the updated rows in log files will get null for partition columns.

To prevent this issue, we suggest disable DROP_PARTITION_COLUMNS while upsert MOR table.

Impact

Fix bug in get partition values from path in MOR log files.

Risk level (write none, low medium or high below)

None.

Documentation Update

Describe any necessary documentation update if there is any new feature, config, or user-facing change

• The config description must be updated if new configs are added or the default value of the configs are changed
• Any new feature or user-facing change requires updating the Hudi website. Please create a Jira ticket, attach the
  ticket number here and follow the instruction to make
  changes to the website.

Contributor's checklist

• Read through contributor's guide
• Change Logs and Impact were stated clearly
• Adequate tests were added if applicable
• CI passed

[hudi-bot]

CI report:

• 54ab8f2 Azure: SUCCESS

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