refactor: reduce the buffered blocks in sink node.

fix(query): refactor and fix some coverity issues.

Revert "test: build taosx and add test case of taosx"

fix(stream): stream state invalid cur

fix(query): remove redundant ts cols in cache scan.

test: build taosx and add test case of taosx

doc: add explanation for dropped 2.x configuration variables

fix: add sys idx case

fix: use sync cfg from vnode

Test/td 19596

fix: coverity scan

fix:error in schemaless if error happens

fix: fix sys idx bug

fix: alter replica one by one

fix: alter replica one by one