wip

docs/VictoriaLogs/CHANGELOG.md

@@ -19,6 +19,8 @@ according to [these docs](https://docs.victoriametrics.com/victorialogs/quicksta
 
 ## tip
 
+* FEATURE: allow omitting `stats` prefix in [`stats` pipe](https://docs.victoriametrics.com/victorialogs/logsql/#stats-pipe). For example, `_time:5m | count() rows` is a valid query now. It is equivalent to `_time:5m | stats count() as rows`.
+* FEATURE: allow omitting `filter` prefix in [`filter` pipe](https://docs.victoriametrics.com/victorialogs/logsql/#filter-pipe) if the filter doesn't clash with [pipe names](#https://docs.victoriametrics.com/victorialogs/logsql/#pipes). For example, `_time:5m | stats by (host) count() rows | rows:>1000` is a valid query now. It is equivalent to `_time:5m | stats by (host) count() rows | filter rows:>1000`.
 * FEATURE: allow [`head` pipe](https://docs.victoriametrics.com/victorialogs/logsql/#limit-pipe) without number. For example, `error | head`. In this case 10 last values are returned as `head` Unix command does by default.
 * FEATURE: allow using [comparison filters](https://docs.victoriametrics.com/victorialogs/logsql/#range-comparison-filters) with strings. For example, `some_text_field:>="foo"` matches [log entries](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) with `some_text_field` field values bigger or equal to `foo`.
 

docs/VictoriaLogs/LogsQL.md

@@ -1391,8 +1391,7 @@ See also:
 
 ### filter pipe
 
-Sometimes it is needed to apply additional filters on the calculated results. This can be done with `| filter ...` [pipe](#pipes).
-The `filter` pipe can contain arbitrary [filters](#filters).
+The `| filter ...` [pipe](#pipes) allows filtering the selected logs entries with arbitrary [filters](#filters).
 
 For example, the following query returns `host` [field](https://docs.victoriametrics.com/victorialogs/keyconcepts/#data-model) values
 if the number of log messages with the `error` [word](#word) for them over the last hour exceeds `1_000`:
@@ -1401,6 +1400,13 @@ if the number of log messages with the `error` [word](#word) for them over the l
 _time:1h error | stats by (host) count() logs_count | filter logs_count:> 1_000
 ```
 
+It is allowed to omit `filter` prefix if the used filters do not clash with [pipe names](#pipes).
+So the following query is equivalent to the previous one:
+
+```logsql
+_time:1h error | stats by (host) count() logs_count | logs_count:> 1_000
+```
+
 See also:
 
 - [`stats` pipe](#stats-pipe)
@@ -1761,6 +1767,12 @@ For example, the following query calculates the following stats for logs over th
 _time:5m | stats count() logs_total, count_uniq(_stream) streams_total
 ```
 
+It is allowed to omit `stats` prefix for convenience. So the following query is equivalent to the previous one:
+
+```logsql
+_time:5m | count() logs_total, count_uniq(_stream) streams_total
+```
+
 See also:
 
 - [stats by fields](#stats-by-fields)

lib/logstorage/parser.go

@@ -252,7 +252,7 @@ func (q *Query) AddCountByTimePipe(step, off int64, fields []string) {
 		s := fmt.Sprintf("stats by (%s) count() hits", byFieldsStr)
 		lex := newLexer(s)
 
-		ps, err := parsePipeStats(lex)
+		ps, err := parsePipeStats(lex, true)
 		if err != nil {
 			logger.Panicf("BUG: unexpected error when parsing [%s]: %s", s, err)
 		}

lib/logstorage/parser_test.go

@@ -1094,7 +1094,7 @@ func TestParseQueryFailure(t *testing.T) {
 	f("")
 	f("|")
 	f("foo|")
-	f("foo|bar")
+	f("foo|bar(")
 	f("foo and")
 	f("foo OR ")
 	f("not")
@@ -1163,7 +1163,7 @@ func TestParseQueryFailure(t *testing.T) {
 	f(`very long query with error aaa ffdfd fdfdfd fdfd:( ffdfdfdfdfd`)
 
 	// query with unexpected tail
-	f(`foo | bar`)
+	f(`foo | bar(`)
 
 	// unexpected comma
 	f(`foo,bar`)
@@ -1284,9 +1284,9 @@ func TestParseQueryFailure(t *testing.T) {
 	// missing pipe keyword
 	f(`foo |`)
 
-	// unknown pipe keyword
-	f(`foo | bar`)
-	f(`foo | fields bar | baz`)
+	// invlaid pipe
+	f(`foo | bar(`)
+	f(`foo | fields bar | baz(`)
 
 	// missing field in fields pipe
 	f(`foo | fields`)

lib/logstorage/pipe.go

@@ -86,6 +86,8 @@ func parsePipes(lex *lexer) ([]pipe, error) {
 			lex.nextToken()
 		case lex.isKeyword(")", ""):
 			return pipes, nil
+		default:
+			return nil, fmt.Errorf("unexpected token after [%s]: %q; expecting '|' or ')'", pipes[len(pipes)-1], lex.token)
 		}
 	}
 }
@@ -123,7 +125,7 @@ func parsePipe(lex *lexer) (pipe, error) {
 		}
 		return pf, nil
 	case lex.isKeyword("filter"):
-		pf, err := parsePipeFilter(lex)
+		pf, err := parsePipeFilter(lex, true)
 		if err != nil {
 			return nil, fmt.Errorf("cannot parse 'filter' pipe: %w", err)
 		}
@@ -177,7 +179,7 @@ func parsePipe(lex *lexer) (pipe, error) {
 		}
 		return ps, nil
 	case lex.isKeyword("stats"):
-		ps, err := parsePipeStats(lex)
+		ps, err := parsePipeStats(lex, true)
 		if err != nil {
 			return nil, fmt.Errorf("cannot parse 'stats' pipe: %w", err)
 		}
@@ -207,6 +209,22 @@ func parsePipe(lex *lexer) (pipe, error) {
 		}
 		return pu, nil
 	default:
+		lexState := lex.backupState()
+
+		// Try parsing stats pipe without 'stats' keyword
+		ps, err := parsePipeStats(lex, false)
+		if err == nil {
+			return ps, nil
+		}
+		lex.restoreState(lexState)
+
+		// Try parsing filter pipe without 'filter' keyword
+		pf, err := parsePipeFilter(lex, false)
+		if err == nil {
+			return pf, nil
+		}
+		lex.restoreState(lexState)
+
 		return nil, fmt.Errorf("unexpected pipe %q", lex.token)
 	}
 }

lib/logstorage/pipe_filter.go

@@ -108,11 +108,13 @@ func (pfp *pipeFilterProcessor) flush() error {
 	return nil
 }
 
-func parsePipeFilter(lex *lexer) (*pipeFilter, error) {
-	if !lex.isKeyword("filter") {
-		return nil, fmt.Errorf("expecting 'filter'; got %q", lex.token)
+func parsePipeFilter(lex *lexer, needFilterKeyword bool) (*pipeFilter, error) {
+	if needFilterKeyword {
+		if !lex.isKeyword("filter") {
+			return nil, fmt.Errorf("expecting 'filter'; got %q", lex.token)
+		}
+		lex.nextToken()
 	}
-	lex.nextToken()
 
 	f, err := parseFilter(lex)
 	if err != nil {

lib/logstorage/pipe_filter_test.go

@@ -32,6 +32,14 @@ func TestPipeFilter(t *testing.T) {
 		expectPipeResults(t, pipeStr, rows, rowsExpected)
 	}
 
+	// filter mismatch, missing 'filter' prefix
+	f("abc", [][]Field{
+		{
+			{"_msg", `{"foo":"bar"}`},
+			{"a", `test`},
+		},
+	}, [][]Field{})
+
 	// filter mismatch
 	f("filter abc", [][]Field{
 		{
@@ -40,6 +48,19 @@ func TestPipeFilter(t *testing.T) {
 		},
 	}, [][]Field{})
 
+	// filter match, missing 'filter' prefix
+	f("foo", [][]Field{
+		{
+			{"_msg", `{"foo":"bar"}`},
+			{"a", `test`},
+		},
+	}, [][]Field{
+		{
+			{"_msg", `{"foo":"bar"}`},
+			{"a", `test`},
+		},
+	})
+
 	// filter match
 	f("filter foo", [][]Field{
 		{

lib/logstorage/pipe_rename.go

@@ -62,7 +62,7 @@ func (pr *pipeRename) hasFilterInWithQuery() bool {
 	return false
 }
 
-func (pr *pipeRename) initFilterInValues(cache map[string][]string, getFieldValuesFunc getFieldValuesFunc) (pipe, error) {
+func (pr *pipeRename) initFilterInValues(_ map[string][]string, _ getFieldValuesFunc) (pipe, error) {
 	return pr, nil
 }
 

lib/logstorage/pipe_stats.go

@@ -537,13 +537,14 @@ func (psp *pipeStatsProcessor) flush() error {
 	return nil
 }
 
-func parsePipeStats(lex *lexer) (*pipeStats, error) {
-	if !lex.isKeyword("stats") {
-		return nil, fmt.Errorf("expecting 'stats'; got %q", lex.token)
+func parsePipeStats(lex *lexer, needStatsKeyword bool) (*pipeStats, error) {
+	if needStatsKeyword {
+		if !lex.isKeyword("stats") {
+			return nil, fmt.Errorf("expecting 'stats'; got %q", lex.token)
+		}
+		lex.nextToken()
 	}
 
-	lex.nextToken()
-
 	var ps pipeStats
 	if lex.isKeyword("by", "(") {
 		if lex.isKeyword("by") {

lib/logstorage/pipe_stats_test.go

@@ -39,6 +39,70 @@ func TestPipeStats(t *testing.T) {
 		expectPipeResults(t, pipeStr, rows, rowsExpected)
 	}
 
+	// missing 'stats' keyword
+	f("count(*) as rows", [][]Field{
+		{
+			{"_msg", `abc`},
+			{"a", `2`},
+			{"b", `3`},
+		},
+		{
+			{"_msg", `def`},
+			{"a", `1`},
+		},
+		{
+			{"a", `2`},
+			{"b", `54`},
+		},
+	}, [][]Field{
+		{
+			{"rows", "3"},
+		},
+	})
+
+	// missing 'stats' keyword
+	f("count() as rows, count() if (a:2) rows2", [][]Field{
+		{
+			{"_msg", `abc`},
+			{"a", `2`},
+			{"b", `3`},
+		},
+		{
+			{"_msg", `def`},
+			{"a", `1`},
+		},
+		{
+			{"a", `2`},
+			{"b", `54`},
+		},
+	}, [][]Field{
+		{
+			{"rows", "3"},
+			{"rows2", "2"},
+		},
+	})
+
+	f("stats count() as rows, count() if (a:2) rows2", [][]Field{
+		{
+			{"_msg", `abc`},
+			{"a", `2`},
+			{"b", `3`},
+		},
+		{
+			{"_msg", `def`},
+			{"a", `1`},
+		},
+		{
+			{"a", `2`},
+			{"b", `54`},
+		},
+	}, [][]Field{
+		{
+			{"rows", "3"},
+			{"rows2", "2"},
+		},
+	})
+
 	f("stats count(*) as rows", [][]Field{
 		{
 			{"_msg", `abc`},
@@ -141,6 +205,32 @@ func TestPipeStats(t *testing.T) {
 		},
 	})
 
+	// missing 'stats' keyword
+	f("by (a) count(*) as rows", [][]Field{
+		{
+			{"_msg", `abc`},
+			{"a", `2`},
+			{"b", `3`},
+		},
+		{
+			{"_msg", `def`},
+			{"a", `1`},
+		},
+		{
+			{"a", `2`},
+			{"b", `54`},
+		},
+	}, [][]Field{
+		{
+			{"a", "1"},
+			{"rows", "1"},
+		},
+		{
+			{"a", "2"},
+			{"rows", "2"},
+		},
+	})
+
 	f("stats by (a) count(*) as rows", [][]Field{
 		{
 			{"_msg", `abc`},