diff --git a/lib/logstorage/block_result.go b/lib/logstorage/block_result.go
index 89e7b8fd1..552cffd47 100644
--- a/lib/logstorage/block_result.go
+++ b/lib/logstorage/block_result.go
@@ -1810,11 +1810,19 @@ type resultColumn struct {
 	values []string
 }
 
-func (rc *resultColumn) resetKeepName() {
+func (rc *resultColumn) resetValues() {
 	clear(rc.values)
 	rc.values = rc.values[:0]
 }
 
+func appendResultColumnWithName(dst []resultColumn, name string) []resultColumn {
+	dst = slicesutil.SetLength(dst, len(dst)+1)
+	rc := &dst[len(dst)-1]
+	rc.resetValues()
+	rc.name = name
+	return dst
+}
+
 // addValue adds the given values v to rc.
 func (rc *resultColumn) addValue(v string) {
 	rc.values = append(rc.values, v)
diff --git a/lib/logstorage/pipe_extract.go b/lib/logstorage/pipe_extract.go
index 541688b6b..67850946f 100644
--- a/lib/logstorage/pipe_extract.go
+++ b/lib/logstorage/pipe_extract.go
@@ -31,14 +31,14 @@ func (pe *pipeExtract) String() string {
 
 func (pe *pipeExtract) updateNeededFields(neededFields, unneededFields fieldsSet) {
 	if neededFields.contains("*") {
+		unneededFieldsOrig := unneededFields.clone()
 		needFromField := false
 		for _, step := range pe.steps {
 			if step.field != "" {
-				if !unneededFields.contains(step.field) {
+				if !unneededFieldsOrig.contains(step.field) {
 					needFromField = true
-				} else {
-					unneededFields.remove(step.field)
 				}
+				unneededFields.add(step.field)
 			}
 		}
 		if needFromField {
@@ -49,11 +49,9 @@ func (pe *pipeExtract) updateNeededFields(neededFields, unneededFields fieldsSet
 	} else {
 		needFromField := false
 		for _, step := range pe.steps {
-			if step.field != "" {
-				if neededFields.contains(step.field) {
-					needFromField = true
-					neededFields.remove(step.field)
-				}
+			if step.field != "" && neededFields.contains(step.field) {
+				needFromField = true
+				neededFields.remove(step.field)
 			}
 		}
 		if needFromField {
@@ -145,7 +143,7 @@ func (pep *pipeExtractProcessor) writeBlock(workerID uint, br *blockResult) {
 	pep.ppBase.writeBlock(workerID, br)
 
 	for i := range rcs {
-		rcs[i].resetKeepName()
+		rcs[i].resetValues()
 	}
 }
 
diff --git a/lib/logstorage/pipe_extract_test.go b/lib/logstorage/pipe_extract_test.go
index 8d0d05d1a..ad6f0f3ea 100644
--- a/lib/logstorage/pipe_extract_test.go
+++ b/lib/logstorage/pipe_extract_test.go
@@ -196,19 +196,19 @@ func TestPipeExtractUpdateNeededFields(t *testing.T) {
 	}
 
 	// all the needed fields
-	f("extract from x '<foo>'", "*", "", "*", "")
+	f("extract from x '<foo>'", "*", "", "*", "foo")
 
 	// all the needed fields, unneeded fields do not intersect with fromField and output fields
-	f("extract from x '<foo>'", "*", "f1,f2", "*", "f1,f2")
+	f("extract from x '<foo>'", "*", "f1,f2", "*", "f1,f2,foo")
 
 	// all the needed fields, unneeded fields intersect with fromField
-	f("extract from x '<foo>'", "*", "f2,x", "*", "f2")
+	f("extract from x '<foo>'", "*", "f2,x", "*", "f2,foo")
 
 	// all the needed fields, unneeded fields intersect with output fields
-	f("extract from x '<foo>x<bar>'", "*", "f2,foo", "*", "f2")
+	f("extract from x '<foo>x<bar>'", "*", "f2,foo", "*", "bar,f2,foo")
 
 	// all the needed fields, unneeded fields intersect with all the output fields
-	f("extract from x '<foo>x<bar>'", "*", "f2,foo,bar", "*", "f2,x")
+	f("extract from x '<foo>x<bar>'", "*", "f2,foo,bar", "*", "bar,f2,foo,x")
 
 	// needed fields do not intersect with fromField and output fields
 	f("extract from x '<foo>x<bar>'", "f1,f2", "", "f1,f2", "")
diff --git a/lib/logstorage/pipe_field_names.go b/lib/logstorage/pipe_field_names.go
index 8209c77ca..9ac1a206d 100644
--- a/lib/logstorage/pipe_field_names.go
+++ b/lib/logstorage/pipe_field_names.go
@@ -143,7 +143,7 @@ func (wctx *pipeFieldNamesWriteContext) flush() {
 	br.setResultColumns(wctx.rcs[:1])
 	wctx.pfp.ppBase.writeBlock(0, br)
 	br.reset()
-	wctx.rcs[0].resetKeepName()
+	wctx.rcs[0].resetValues()
 }
 
 func parsePipeFieldNames(lex *lexer) (*pipeFieldNames, error) {
diff --git a/lib/logstorage/pipe_sort.go b/lib/logstorage/pipe_sort.go
index d92b1924a..a29da7aa4 100644
--- a/lib/logstorage/pipe_sort.go
+++ b/lib/logstorage/pipe_sort.go
@@ -521,14 +521,10 @@ func (wctx *pipeSortWriteContext) writeNextRow(shard *pipeSortProcessorShard) {
 
 		rcs = wctx.rcs[:0]
 		for _, bf := range byFields {
-			rcs = append(rcs, resultColumn{
-				name: bf.name,
-			})
+			rcs = appendResultColumnWithName(rcs, bf.name)
 		}
 		for _, c := range b.otherColumns {
-			rcs = append(rcs, resultColumn{
-				name: c.name,
-			})
+			rcs = appendResultColumnWithName(rcs, c.name)
 		}
 		wctx.rcs = rcs
 	}
@@ -567,7 +563,7 @@ func (wctx *pipeSortWriteContext) flush() {
 	wctx.psp.ppBase.writeBlock(0, br)
 	br.reset()
 	for i := range rcs {
-		rcs[i].resetKeepName()
+		rcs[i].resetValues()
 	}
 }
 
diff --git a/lib/logstorage/pipe_stats.go b/lib/logstorage/pipe_stats.go
index ea9e34ab7..1397a1e60 100644
--- a/lib/logstorage/pipe_stats.go
+++ b/lib/logstorage/pipe_stats.go
@@ -434,14 +434,10 @@ func (psp *pipeStatsProcessor) flush() error {
 
 	rcs := make([]resultColumn, 0, len(byFields)+len(psp.ps.funcs))
 	for _, bf := range byFields {
-		rcs = append(rcs, resultColumn{
-			name: bf.name,
-		})
+		rcs = appendResultColumnWithName(rcs, bf.name)
 	}
 	for _, f := range psp.ps.funcs {
-		rcs = append(rcs, resultColumn{
-			name: f.resultName,
-		})
+		rcs = appendResultColumnWithName(rcs, f.resultName)
 	}
 	var br blockResult
 
@@ -487,7 +483,7 @@ func (psp *pipeStatsProcessor) flush() error {
 			psp.ppBase.writeBlock(0, &br)
 			br.reset()
 			for i := range rcs {
-				rcs[i].resetKeepName()
+				rcs[i].resetValues()
 			}
 			valuesLen = 0
 		}
diff --git a/lib/logstorage/pipe_topk.go b/lib/logstorage/pipe_topk.go
index 34504df90..ea77370e1 100644
--- a/lib/logstorage/pipe_topk.go
+++ b/lib/logstorage/pipe_topk.go
@@ -462,14 +462,10 @@ func (wctx *pipeTopkWriteContext) writeNextRow(shard *pipeTopkProcessorShard) bo
 
 		rcs = wctx.rcs[:0]
 		for _, bf := range byFields {
-			rcs = append(rcs, resultColumn{
-				name: bf.name,
-			})
+			rcs = appendResultColumnWithName(rcs, bf.name)
 		}
 		for _, c := range r.otherColumns {
-			rcs = append(rcs, resultColumn{
-				name: c.Name,
-			})
+			rcs = appendResultColumnWithName(rcs, c.Name)
 		}
 		wctx.rcs = rcs
 	}
@@ -515,7 +511,7 @@ func (wctx *pipeTopkWriteContext) flush() {
 	wctx.ptp.ppBase.writeBlock(0, br)
 	br.reset()
 	for i := range rcs {
-		rcs[i].resetKeepName()
+		rcs[i].resetValues()
 	}
 }
 
diff --git a/lib/logstorage/pipe_uniq.go b/lib/logstorage/pipe_uniq.go
index 03068bb73..6b43fb442 100644
--- a/lib/logstorage/pipe_uniq.go
+++ b/lib/logstorage/pipe_uniq.go
@@ -359,9 +359,7 @@ func (wctx *pipeUniqWriteContext) writeRow(rowFields []Field) {
 
 		rcs = wctx.rcs[:0]
 		for _, f := range rowFields {
-			rcs = append(rcs, resultColumn{
-				name: f.Name,
-			})
+			rcs = appendResultColumnWithName(rcs, f.Name)
 		}
 		wctx.rcs = rcs
 	}
@@ -391,7 +389,7 @@ func (wctx *pipeUniqWriteContext) flush() {
 	wctx.pup.ppBase.writeBlock(0, br)
 	br.reset()
 	for i := range rcs {
-		rcs[i].resetKeepName()
+		rcs[i].resetValues()
 	}
 }
 
diff --git a/lib/logstorage/pipe_unpack_json.go b/lib/logstorage/pipe_unpack_json.go
new file mode 100644
index 000000000..52a3d2b4a
--- /dev/null
+++ b/lib/logstorage/pipe_unpack_json.go
@@ -0,0 +1,237 @@
+package logstorage
+
+import (
+	"fmt"
+	"unsafe"
+
+	"github.com/valyala/fastjson"
+
+	"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
+)
+
+// pipeUnpackJSON processes '| unpack_json ...' pipe.
+//
+// See https://docs.victoriametrics.com/victorialogs/logsql/#unpack_json-pipe
+type pipeUnpackJSON struct {
+	fromField string
+
+	resultPrefix string
+}
+
+func (pu *pipeUnpackJSON) String() string {
+	s := "unpack_json"
+	if !isMsgFieldName(pu.fromField) {
+		s += " from " + quoteTokenIfNeeded(pu.fromField)
+	}
+	if pu.resultPrefix != "" {
+		s += " prefix " + quoteTokenIfNeeded(pu.resultPrefix)
+	}
+	return s
+}
+
+func (pu *pipeUnpackJSON) updateNeededFields(neededFields, unneededFields fieldsSet) {
+	if neededFields.contains("*") {
+		unneededFields.remove(pu.fromField)
+	} else {
+		neededFields.add(pu.fromField)
+	}
+}
+
+func (pu *pipeUnpackJSON) newPipeProcessor(workersCount int, stopCh <-chan struct{}, _ func(), ppBase pipeProcessor) pipeProcessor {
+	shards := make([]pipeUnpackJSONProcessorShard, workersCount)
+
+	pup := &pipeUnpackJSONProcessor{
+		pu:     pu,
+		stopCh: stopCh,
+		ppBase: ppBase,
+
+		shards: shards,
+	}
+	return pup
+}
+
+type pipeUnpackJSONProcessor struct {
+	pu     *pipeUnpackJSON
+	stopCh <-chan struct{}
+	ppBase pipeProcessor
+
+	shards []pipeUnpackJSONProcessorShard
+}
+
+type pipeUnpackJSONProcessorShard struct {
+	pipeUnpackJSONProcessorShardNopad
+
+	// The padding prevents false sharing on widespread platforms with 128 mod (cache line size) = 0 .
+	_ [128 - unsafe.Sizeof(pipeUnpackJSONProcessorShardNopad{})%128]byte
+}
+
+type pipeUnpackJSONProcessorShardNopad struct {
+	jsonParser    fastjson.Parser
+	jsonFields    []Field
+	jsonValuesBuf []byte
+
+	rcs []resultColumn
+	br  blockResult
+
+	valuesLen int
+}
+
+func (shard *pipeUnpackJSONProcessorShard) writeRow(ppBase pipeProcessor, br *blockResult, cs []*blockResultColumn, rowIdx int, extraFields []Field) {
+	rcs := shard.rcs
+
+	areEqualColumns := len(rcs) == len(cs)+len(extraFields)
+	if areEqualColumns {
+		for i, f := range extraFields {
+			if rcs[len(rcs)+i].name != f.Name {
+				areEqualColumns = false
+				break
+			}
+		}
+	}
+	if !areEqualColumns {
+		// send the current block to bbBase and construct a block with new set of columns
+		shard.flush(ppBase)
+
+		rcs = shard.rcs[:0]
+		for _, c := range cs {
+			rcs = appendResultColumnWithName(rcs, c.name)
+		}
+		for _, f := range extraFields {
+			rcs = appendResultColumnWithName(rcs, f.Name)
+		}
+		shard.rcs = rcs
+	}
+
+	for i, c := range cs {
+		v := c.getValueAtRow(br, rowIdx)
+		rcs[i].addValue(v)
+		shard.valuesLen += len(v)
+	}
+	for i, f := range extraFields {
+		v := f.Value
+		rcs[len(rcs)+i].addValue(v)
+		shard.valuesLen += len(v)
+	}
+	if shard.valuesLen >= 1_000_000 {
+		shard.flush(ppBase)
+	}
+}
+
+func (shard *pipeUnpackJSONProcessorShard) flush(ppBase pipeProcessor) {
+	rcs := shard.rcs
+
+	shard.valuesLen = 0
+
+	if len(rcs) == 0 {
+		return
+	}
+
+	// Flush rcs to ppBase
+	br := &shard.br
+	br.setResultColumns(rcs)
+	ppBase.writeBlock(0, br)
+	br.reset()
+	for i := range rcs {
+		rcs[i].resetValues()
+	}
+}
+
+func (shard *pipeUnpackJSONProcessorShard) parseJSONFields(resultPrefix, v string) {
+	clear(shard.jsonFields)
+	shard.jsonFields = shard.jsonFields[:0]
+	shard.jsonValuesBuf = shard.jsonValuesBuf[:0]
+
+	jsv, err := shard.jsonParser.Parse(v)
+	if err != nil {
+		return
+	}
+	jso := jsv.GetObject()
+	buf := shard.jsonValuesBuf
+	jso.Visit(func(k []byte, v *fastjson.Value) {
+		var bv []byte
+		if v.Type() == fastjson.TypeString {
+			bv = v.GetStringBytes()
+		} else {
+			bufLen := len(buf)
+			buf = v.MarshalTo(buf)
+			bv = buf[bufLen:]
+		}
+		if resultPrefix != "" {
+			bufLen := len(buf)
+			buf = append(buf, resultPrefix...)
+			buf = append(buf, k...)
+			k = buf[bufLen:]
+		}
+		shard.jsonFields = append(shard.jsonFields, Field{
+			Name:  bytesutil.ToUnsafeString(k),
+			Value: bytesutil.ToUnsafeString(bv),
+		})
+	})
+	shard.jsonValuesBuf = buf
+}
+
+func (pup *pipeUnpackJSONProcessor) writeBlock(workerID uint, br *blockResult) {
+	if len(br.timestamps) == 0 {
+		return
+	}
+
+	resultPrefix := pup.pu.resultPrefix
+	shard := &pup.shards[workerID]
+
+	cs := br.getColumns()
+	c := br.getColumnByName(pup.pu.fromField)
+	if c.isConst {
+		v := c.valuesEncoded[0]
+		shard.parseJSONFields(resultPrefix, v)
+		for rowIdx := range br.timestamps {
+			shard.writeRow(pup.ppBase, br, cs, rowIdx, shard.jsonFields)
+		}
+	} else {
+		values := c.getValues(br)
+		for i, v := range values {
+			if i == 0 || values[i-1] != v {
+				shard.parseJSONFields(resultPrefix, v)
+			}
+			shard.writeRow(pup.ppBase, br, cs, i, shard.jsonFields)
+		}
+	}
+
+	shard.flush(pup.ppBase)
+}
+
+func (pup *pipeUnpackJSONProcessor) flush() error {
+	return nil
+}
+
+func parsePipeUnpackJSON(lex *lexer) (*pipeUnpackJSON, error) {
+	if !lex.isKeyword("unpack_json") {
+		return nil, fmt.Errorf("unexpected token: %q; want %q", lex.token, "unpack_json")
+	}
+	lex.nextToken()
+
+	fromField := "_msg"
+	if lex.isKeyword("from") {
+		lex.nextToken()
+		f, err := parseFieldName(lex)
+		if err != nil {
+			return nil, fmt.Errorf("cannot parse 'from' field name: %w", err)
+		}
+		fromField = f
+	}
+
+	resultPrefix := ""
+	if lex.isKeyword("result_prefix") {
+		lex.nextToken()
+		p, err := getCompoundToken(lex)
+		if err != nil {
+			return nil, fmt.Errorf("cannot parse 'result_prefix': %w", err)
+		}
+		resultPrefix = p
+	}
+
+	pu := &pipeUnpackJSON{
+		fromField:    fromField,
+		resultPrefix: resultPrefix,
+	}
+	return pu, nil
+}
diff --git a/lib/logstorage/pipe_unpack_json_test.go b/lib/logstorage/pipe_unpack_json_test.go
new file mode 100644
index 000000000..8d3dc1c9a
--- /dev/null
+++ b/lib/logstorage/pipe_unpack_json_test.go
@@ -0,0 +1,38 @@
+package logstorage
+
+import (
+	"testing"
+)
+
+func TestPipeUnpackJSONUpdateNeededFields(t *testing.T) {
+	f := func(s string, neededFields, unneededFields, neededFieldsExpected, unneededFieldsExpected string) {
+		t.Helper()
+
+		nfs := newTestFieldsSet(neededFields)
+		unfs := newTestFieldsSet(unneededFields)
+
+		lex := newLexer(s)
+		p, err := parsePipeUnpackJSON(lex)
+		if err != nil {
+			t.Fatalf("cannot parse %s: %s", s, err)
+		}
+		p.updateNeededFields(nfs, unfs)
+
+		assertNeededFields(t, nfs, unfs, neededFieldsExpected, unneededFieldsExpected)
+	}
+
+	// all the needed fields
+	f("unpack_json from x", "*", "", "*", "")
+
+	// all the needed fields, unneeded fields do not intersect with src
+	f("unpack_json from x", "*", "f1,f2", "*", "f1,f2")
+
+	// all the needed fields, unneeded fields intersect with src
+	f("unpack_json from x", "*", "f2,x", "*", "f2")
+
+	// needed fields do not intersect with src
+	f("unpack_json from x", "f1,f2", "", "f1,f2,x", "")
+
+	// needed fields intersect with src
+	f("unpack_json from x", "f2,x", "", "f2,x", "")
+}