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row_sel_sec_rec_is_for_clust_rec() treats empty BLOB prefix field in secondary index as a field equal to any external BLOB field in clustered index. Row_sel_get_clust_rec_for_mysql::operator() doesn't zerro out clustered record pointer in row_search_mvcc(), and row_search_mvcc() thinks that delete-marked secondary index record has visible for "CHECK TABLE"'s read view old-versioned clustered index record, and row_scan_index_for_mysql() counts it as a row. The fix is to execute row_sel_sec_rec_is_for_blob() in row_sel_sec_rec_is_for_clust_rec() if clustered field contains BLOB's reference.