fix(query): fix memory leak.

opt(query): opt tbname_in query

fix: coverity issues

feat(stream): distribute interval  disc buff

* docs: add prometheus sub-table naming by rule note

* docs: fix show databases output

enhance: optimize when select from ins_tags when table_name='xxxx'

fix(query): fix tbname mismatch with multiple rows output functions 

fix: coverity issues

build: add websocket build

feat: sql command 'show table tags from table_name'

refactor(query): do some internal refactor.

* docs: add table name customization note

* docs: fix a typo