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lib/logstorage: add pipe json_array_concat #1408
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faccd78
lib/logstorage: add json_array_concat pipe
cuongleqq 593ce95
docs: add json_array_concat pipe documentation
cuongleqq 8824246
lib/logstorage: improve test coverage for json_array_concat pipe
cuongleqq d0dccc7
lib/logstorage: trim JSON whitespace in json_array_concat pipe
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,213 @@ | ||
| package logstorage | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/valyala/fastjson" | ||
|
|
||
| "github.com/VictoriaMetrics/VictoriaMetrics/lib/atomicutil" | ||
| "github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil" | ||
|
|
||
| "github.com/VictoriaMetrics/VictoriaLogs/lib/prefixfilter" | ||
| ) | ||
|
|
||
| // pipeJSONArrayConcat processes '| json_array_concat ...' pipe. | ||
| // | ||
| // See https://docs.victoriametrics.com/victorialogs/logsql/#json_array_concat-pipe | ||
| type pipeJSONArrayConcat struct { | ||
| delimiter string | ||
| fromField string | ||
| resultField string | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) String() string { | ||
| s := "json_array_concat" | ||
| if pc.delimiter != "" { | ||
| s += " " + quoteTokenIfNeeded(pc.delimiter) | ||
| } | ||
| if !isMsgFieldName(pc.fromField) { | ||
| s += " from " + quoteTokenIfNeeded(pc.fromField) | ||
| } | ||
| if pc.resultField != pc.fromField { | ||
| s += " as " + quoteTokenIfNeeded(pc.resultField) | ||
| } | ||
| return s | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) splitToRemoteAndLocal(_ int64) (pipe, []pipe) { | ||
| return pc, nil | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) canLiveTail() bool { | ||
| return true | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) canReturnLastNResults() bool { | ||
| return pc.resultField != "_time" | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) isFixedOutputFieldsOrder() bool { | ||
| return false | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) updateNeededFields(pf *prefixfilter.Filter) { | ||
| if pf.MatchString(pc.resultField) { | ||
| pf.AddDenyFilter(pc.resultField) | ||
| pf.AddAllowFilter(pc.fromField) | ||
| } | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) hasFilterInWithQuery() bool { | ||
| return false | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) initFilterInValues(_ *inValuesCache, _ getFieldValuesFunc) (pipe, error) { | ||
| return pc, nil | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) visitSubqueries(_ func(q *Query)) { | ||
| // nothing to do | ||
| } | ||
|
|
||
| func (pc *pipeJSONArrayConcat) newPipeProcessor(_ int, _ <-chan struct{}, _ func(), ppNext pipeProcessor) pipeProcessor { | ||
| pcp := &pipeJSONArrayConcatProcessor{ | ||
| pc: pc, | ||
| ppNext: ppNext, | ||
| } | ||
| pcp.shards.Init = func(shard *pipeJSONArrayConcatProcessorShard) { | ||
| shard.reset() | ||
| } | ||
| return pcp | ||
| } | ||
|
|
||
| type pipeJSONArrayConcatProcessor struct { | ||
| pc *pipeJSONArrayConcat | ||
| ppNext pipeProcessor | ||
|
|
||
| shards atomicutil.Slice[pipeJSONArrayConcatProcessorShard] | ||
| } | ||
|
|
||
| func (plp *pipeJSONArrayConcatProcessor) writeBlock(workerID uint, br *blockResult) { | ||
| if br.rowsLen == 0 { | ||
| return | ||
| } | ||
|
|
||
| shard := plp.shards.Get(workerID) | ||
| shard.rc.name = plp.pc.resultField | ||
|
|
||
| c := br.getColumnByName(plp.pc.fromField) | ||
| delimiter := plp.pc.delimiter | ||
| if c.isConst { | ||
| // Fast path for const column | ||
| v := c.valuesEncoded[0] | ||
| out := shard.concat(v, delimiter) | ||
| shard.rc.addValue(out) | ||
| br.addResultColumnConst(shard.rc) | ||
| } else { | ||
| // Slow path for other columns | ||
| values := c.getValues(br) | ||
| prevOut := "" | ||
| for rowIdx := range values { | ||
| if rowIdx == 0 || values[rowIdx] != values[rowIdx-1] { | ||
| prevOut = shard.concat(values[rowIdx], delimiter) | ||
| } | ||
| shard.rc.addValue(prevOut) | ||
| } | ||
| br.addResultColumn(shard.rc) | ||
| } | ||
|
|
||
| plp.ppNext.writeBlock(workerID, br) | ||
|
|
||
| shard.reset() | ||
| } | ||
|
|
||
| type pipeJSONArrayConcatProcessorShard struct { | ||
| a arena | ||
| rc resultColumn | ||
| } | ||
|
|
||
| func (shard *pipeJSONArrayConcatProcessorShard) reset() { | ||
| shard.a.reset() | ||
| shard.rc.reset() | ||
| } | ||
|
|
||
| func (shard *pipeJSONArrayConcatProcessorShard) concat(arrayStr, delimiter string) string { | ||
| arrayStr = trimJSONWhitespace(arrayStr) | ||
| if len(arrayStr) == 0 || arrayStr[0] != '[' { | ||
| return "" | ||
| } | ||
|
|
||
| p := jspp.Get() | ||
| defer jspp.Put(p) | ||
|
|
||
| jsv, err := p.Parse(arrayStr) | ||
| if err != nil { | ||
| return "" | ||
| } | ||
| jsa, err := jsv.Array() | ||
| if err != nil || len(jsa) == 0 { | ||
| return "" | ||
| } | ||
|
|
||
| bLen := len(shard.a.b) | ||
| for i, item := range jsa { | ||
| if i > 0 { | ||
| shard.a.b = append(shard.a.b, delimiter...) | ||
| } | ||
| if item.Type() == fastjson.TypeString { | ||
| sb, _ := item.StringBytes() | ||
| shard.a.b = append(shard.a.b, sb...) | ||
| } else { | ||
| shard.a.b = item.MarshalTo(shard.a.b) | ||
| } | ||
| } | ||
| return bytesutil.ToUnsafeString(shard.a.b[bLen:]) | ||
| } | ||
|
|
||
| func (plp *pipeJSONArrayConcatProcessor) flush() error { | ||
| return nil | ||
| } | ||
|
|
||
| func parsePipeJSONArrayConcat(lex *lexer) (pipe, error) { | ||
| if !lex.isKeyword("json_array_concat") { | ||
| return nil, fmt.Errorf("unexpected token: %q; want %q", lex.token, "json_array_concat") | ||
| } | ||
| lex.nextToken() | ||
|
|
||
| delimiter := "" | ||
| if !lex.isKeyword("from", "as", "|", ")", "") { | ||
| s, err := lex.nextCompoundToken() | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot parse delimiter for 'json_array_concat': %w", err) | ||
| } | ||
| delimiter = s | ||
| } | ||
|
|
||
| fromField := "_msg" | ||
| if lex.isKeyword("from") { | ||
| lex.nextToken() | ||
| f, err := parseFieldName(lex) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot parse 'from' field for 'json_array_concat': %w", err) | ||
| } | ||
| fromField = f | ||
| } | ||
|
|
||
| resultField := fromField | ||
| if lex.isKeyword("as") { | ||
| lex.nextToken() | ||
| } | ||
| if !lex.isKeyword("|", ")", "") { | ||
| f, err := parseFieldName(lex) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("cannot parse result field for 'json_array_concat': %w", err) | ||
| } | ||
| resultField = f | ||
| } | ||
|
|
||
| return &pipeJSONArrayConcat{ | ||
| delimiter: delimiter, | ||
| fromField: fromField, | ||
| resultField: resultField, | ||
| }, nil | ||
| } | ||
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