[Enhancement] enable doris truncate hive table partition

[lschampion]

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• I had searched in the issues and found no similar issues.

Description

if found that there is no way truncate a partition of hive table in doris. this is real inconvient! maybe we should add support to the operation.

Solution

add "alter table drop partition" sytnax.

Are you willing to submit PR?

• Yes I am willing to submit a PR!

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