fix queryinterval failure

[TD-1313]<hotfix>: update TSDBDatabaseMetadata

[TD-1313]<hotfix>: implement getColumns method in the TSDBDatabaseMetadata and update the next method in DatabaseMetaDataResultSet

Feature/http

Coverity scan

Update faq-ch.md

Update faq-ch.md

Update administrator-ch.md

Merge from develop into coverity scan

Feature/os

Hotfix/test

Add alter user privilledge in Document

add alter user privilledge

Merge pull request #3699 from taosdata/feature/http

Feature/http

TD-1617