Revert "write comments"

This reverts commit dd859b972737b35eced96ea63c4fa3a1e7e46a5f.
Revert "write comments"

This reverts commit a491785cfc10c23fbca67c2d4ce05e2f7b461cb3.
Revert "optimization about passing params"

This reverts commit 34d6fe071250ae61333f60f5dfe37e3bfbe48fbe.
Revert "make dbcheck support new doclen format"

This reverts commit b115803759a21a6f0e2fb39d6bc95e3df6e94dd9.
Revert "apply fixed width format to doclen chunk"

This reverts commit fe4a2a4d7ef55dbc9928476a73fcda9c6a54300b.