yshihao

Results 2 issues of yshihao

No symbol zstd_compress in the zstd library, therefore the macro HAVE_ZSTD will always be not defined.Change it to a symbol exist in zstd library.

In the test TableFileIndexData of file corruption_test.cc, i comment the line corruping data. then the check function failed, this is correct because the data are not corrupted. but if i...