Revert "Compatible with RocksDB v6.16, tecbot#203"

This reverts commit 9decd5d.

checkpoint_test.go

@@ -41,8 +41,8 @@ func TestCheckpoint(t *testing.T) {
 	opts := NewDefaultOptions()
 	opts.SetCreateIfMissing(true)
 	dbCheck, err = OpenDb(opts, dir)
-	ensure.Nil(t, err)
 	defer dbCheck.Close()
+	ensure.Nil(t, err)
 
 	// test keys
 	var value *Slice

db.go

@@ -587,6 +587,89 @@ func (db *DB) DropColumnFamily(c *ColumnFamilyHandle) error {
 	return nil
 }
 
+// GetApproximateSizes returns the approximate number of bytes of file system
+// space used by one or more key ranges.
+//
+// The keys counted will begin at Range.Start and end on the key before
+// Range.Limit.
+func (db *DB) GetApproximateSizes(ranges []Range) []uint64 {
+	sizes := make([]uint64, len(ranges))
+	if len(ranges) == 0 {
+		return sizes
+	}
+
+	cStarts := make([]*C.char, len(ranges))
+	cLimits := make([]*C.char, len(ranges))
+	cStartLens := make([]C.size_t, len(ranges))
+	cLimitLens := make([]C.size_t, len(ranges))
+	for i, r := range ranges {
+		cStarts[i] = (*C.char)(C.CBytes(r.Start))
+		cStartLens[i] = C.size_t(len(r.Start))
+		cLimits[i] = (*C.char)(C.CBytes(r.Limit))
+		cLimitLens[i] = C.size_t(len(r.Limit))
+	}
+
+	defer func() {
+		for i := range ranges {
+			C.free(unsafe.Pointer(cStarts[i]))
+			C.free(unsafe.Pointer(cLimits[i]))
+		}
+	}()
+
+	C.rocksdb_approximate_sizes(
+		db.c,
+		C.int(len(ranges)),
+		&cStarts[0],
+		&cStartLens[0],
+		&cLimits[0],
+		&cLimitLens[0],
+		(*C.uint64_t)(&sizes[0]))
+
+	return sizes
+}
+
+// GetApproximateSizesCF returns the approximate number of bytes of file system
+// space used by one or more key ranges in the column family.
+//
+// The keys counted will begin at Range.Start and end on the key before
+// Range.Limit.
+func (db *DB) GetApproximateSizesCF(cf *ColumnFamilyHandle, ranges []Range) []uint64 {
+	sizes := make([]uint64, len(ranges))
+	if len(ranges) == 0 {
+		return sizes
+	}
+
+	cStarts := make([]*C.char, len(ranges))
+	cLimits := make([]*C.char, len(ranges))
+	cStartLens := make([]C.size_t, len(ranges))
+	cLimitLens := make([]C.size_t, len(ranges))
+	for i, r := range ranges {
+		cStarts[i] = (*C.char)(C.CBytes(r.Start))
+		cStartLens[i] = C.size_t(len(r.Start))
+		cLimits[i] = (*C.char)(C.CBytes(r.Limit))
+		cLimitLens[i] = C.size_t(len(r.Limit))
+	}
+
+	defer func() {
+		for i := range ranges {
+			C.free(unsafe.Pointer(cStarts[i]))
+			C.free(unsafe.Pointer(cLimits[i]))
+		}
+	}()
+
+	C.rocksdb_approximate_sizes_cf(
+		db.c,
+		cf.c,
+		C.int(len(ranges)),
+		&cStarts[0],
+		&cStartLens[0],
+		&cLimits[0],
+		&cLimitLens[0],
+		(*C.uint64_t)(&sizes[0]))
+
+	return sizes
+}
+
 // SetOptions dynamically changes options through the SetOptions API.
 func (db *DB) SetOptions(keys, values []string) error {
 	num_keys := len(keys)