release-22.1: sql: add join types and algorithms to telemetry logging

docs/generated/eventlog.md

@@ -2447,6 +2447,21 @@ contains common SQL event/execution details.
 | `BytesRead` | The number of bytes read from disk. | no |
 | `RowsRead` | The number of rows read from disk. | no |
 | `RowsWritten` | The number of rows written. | no |
+| `InnerJoinCount` | The number of inner joins in the query plan. | no |
+| `LeftOuterJoinCount` | The number of left (or right) outer joins in the query plan. | no |
+| `FullOuterJoinCount` | The number of full outer joins in the query plan. | no |
+| `SemiJoinCount` | The number of semi joins in the query plan. | no |
+| `AntiJoinCount` | The number of anti joins in the query plan. | no |
+| `IntersectAllJoinCount` | The number of intersect all joins in the query plan. | no |
+| `ExceptAllJoinCount` | The number of except all joins in the query plan. | no |
+| `HashJoinCount` | The number of hash joins in the query plan. | no |
+| `CrossJoinCount` | The number of cross joins in the query plan. | no |
+| `IndexJoinCount` | The number of index joins in the query plan. | no |
+| `LookupJoinCount` | The number of lookup joins in the query plan. | no |
+| `MergeJoinCount` | The number of merge joins in the query plan. | no |
+| `InvertedJoinCount` | The number of inverted joins in the query plan. | no |
+| `ApplyJoinCount` | The number of apply joins in the query plan. | no |
+| `ZigZagJoinCount` | The number of zig zag joins in the query plan. | no |
 
 
 #### Common fields

pkg/sql/exec_log.go

@@ -20,6 +20,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/settings"
 	"github.com/cockroachdb/cockroach/pkg/sql/catalog"
 	"github.com/cockroachdb/cockroach/pkg/sql/catalog/descpb"
+	"github.com/cockroachdb/cockroach/pkg/sql/opt/exec"
 	"github.com/cockroachdb/cockroach/pkg/sql/pgwire/pgerror"
 	"github.com/cockroachdb/cockroach/pkg/sql/privilege"
 	"github.com/cockroachdb/cockroach/pkg/sql/sem/tree"
@@ -409,6 +410,21 @@ func (p *planner) maybeLogStatementInternal(
 				BytesRead:                queryStats.bytesRead,
 				RowsRead:                 queryStats.rowsRead,
 				RowsWritten:              queryStats.rowsWritten,
+				InnerJoinCount:           int64(p.curPlan.instrumentation.joinTypeCounts[descpb.InnerJoin]),
+				LeftOuterJoinCount:       int64(p.curPlan.instrumentation.joinTypeCounts[descpb.LeftOuterJoin]),
+				FullOuterJoinCount:       int64(p.curPlan.instrumentation.joinTypeCounts[descpb.FullOuterJoin]),
+				SemiJoinCount:            int64(p.curPlan.instrumentation.joinTypeCounts[descpb.LeftSemiJoin]),
+				AntiJoinCount:            int64(p.curPlan.instrumentation.joinTypeCounts[descpb.LeftAntiJoin]),
+				IntersectAllJoinCount:    int64(p.curPlan.instrumentation.joinTypeCounts[descpb.IntersectAllJoin]),
+				ExceptAllJoinCount:       int64(p.curPlan.instrumentation.joinTypeCounts[descpb.ExceptAllJoin]),
+				HashJoinCount:            int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.HashJoin]),
+				CrossJoinCount:           int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.CrossJoin]),
+				IndexJoinCount:           int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.IndexJoin]),
+				LookupJoinCount:          int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.LookupJoin]),
+				MergeJoinCount:           int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.MergeJoin]),
+				InvertedJoinCount:        int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.InvertedJoin]),
+				ApplyJoinCount:           int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.ApplyJoin]),
+				ZigZagJoinCount:          int64(p.curPlan.instrumentation.joinAlgorithmCounts[exec.ZigZagJoin]),
 			}
 			p.logOperationalEventsOnlyExternally(ctx, eventLogEntry{event: &sampledQuery})
 		} else {

pkg/sql/instrumentation.go

@@ -22,6 +22,7 @@ import (
 	"github.com/cockroachdb/cockroach/pkg/server/telemetry"
 	"github.com/cockroachdb/cockroach/pkg/settings"
 	"github.com/cockroachdb/cockroach/pkg/sql/catalog/colinfo"
+	"github.com/cockroachdb/cockroach/pkg/sql/catalog/descpb"
 	"github.com/cockroachdb/cockroach/pkg/sql/execinfrapb"
 	"github.com/cockroachdb/cockroach/pkg/sql/execstats"
 	"github.com/cockroachdb/cockroach/pkg/sql/opt/exec"
@@ -149,6 +150,14 @@ type instrumentationHelper struct {
 	// nanosSinceStatsCollected is the maximum number of nanoseconds that have
 	// passed since stats were collected on any table scanned by this query.
 	nanosSinceStatsCollected time.Duration
+
+	// joinTypeCounts records the number of times each type of logical join was
+	// used in the query.
+	joinTypeCounts map[descpb.JoinType]int
+
+	// joinAlgorithmCounts records the number of times each type of join algorithm
+	// was used in the query.
+	joinAlgorithmCounts map[exec.JoinAlgorithm]int
 }
 
 // outputMode indicates how the statement output needs to be populated (for

pkg/sql/opt/exec/execbuilder/builder.go

@@ -13,6 +13,7 @@ package execbuilder
 import (
 	"time"
 
+	"github.com/cockroachdb/cockroach/pkg/sql/catalog/descpb"
 	"github.com/cockroachdb/cockroach/pkg/sql/opt"
 	"github.com/cockroachdb/cockroach/pkg/sql/opt/cat"
 	"github.com/cockroachdb/cockroach/pkg/sql/opt/exec"
@@ -126,6 +127,14 @@ type Builder struct {
 	// NanosSinceStatsCollected is the maximum number of nanoseconds that have
 	// passed since stats were collected on any table scanned by this query.
 	NanosSinceStatsCollected time.Duration
+
+	// JoinTypeCounts records the number of times each type of logical join was
+	// used in the query.
+	JoinTypeCounts map[descpb.JoinType]int
+
+	// JoinAlgorithmCounts records the number of times each type of join algorithm
+	// was used in the query.
+	JoinAlgorithmCounts map[exec.JoinAlgorithm]int
 }
 
 // New constructs an instance of the execution node builder using the

pkg/sql/opt/exec/execbuilder/relational.go

@@ -1056,6 +1056,8 @@ func (b *Builder) buildApplyJoin(join memo.RelExpr) (execPlan, error) {
 
 	ep := execPlan{outputCols: outputCols}
 
+	b.recordJoinType(joinType)
+	b.recordJoinAlgorithm(exec.ApplyJoin)
 	ep.root, err = b.factory.ConstructApplyJoin(
 		joinType,
 		leftPlan.root,
@@ -1140,11 +1142,12 @@ func (b *Builder) buildHashJoin(join memo.RelExpr) (execPlan, error) {
 		rightExpr.Relational().OutputCols,
 		*filters,
 	)
+	isCrossJoin := len(leftEq) == 0
 	if !b.disableTelemetry {
-		if len(leftEq) > 0 {
-			telemetry.Inc(sqltelemetry.JoinAlgoHashUseCounter)
-		} else {
+		if isCrossJoin {
 			telemetry.Inc(sqltelemetry.JoinAlgoCrossUseCounter)
+		} else {
+			telemetry.Inc(sqltelemetry.JoinAlgoHashUseCounter)
 		}
 		telemetry.Inc(opt.JoinTypeToUseCounter(join.Op()))
 	}
@@ -1172,6 +1175,12 @@ func (b *Builder) buildHashJoin(join memo.RelExpr) (execPlan, error) {
 	leftEqColsAreKey := leftExpr.Relational().FuncDeps.ColsAreStrictKey(leftEq.ToSet())
 	rightEqColsAreKey := rightExpr.Relational().FuncDeps.ColsAreStrictKey(rightEq.ToSet())
 
+	b.recordJoinType(joinType)
+	if isCrossJoin {
+		b.recordJoinAlgorithm(exec.CrossJoin)
+	} else {
+		b.recordJoinAlgorithm(exec.HashJoin)
+	}
 	ep.root, err = b.factory.ConstructHashJoin(
 		joinType,
 		left.root, right.root,
@@ -1226,6 +1235,8 @@ func (b *Builder) buildMergeJoin(join *memo.MergeJoinExpr) (execPlan, error) {
 	reqOrd := ep.reqOrdering(join)
 	leftEqColsAreKey := leftExpr.Relational().FuncDeps.ColsAreStrictKey(leftEq.ColSet())
 	rightEqColsAreKey := rightExpr.Relational().FuncDeps.ColsAreStrictKey(rightEq.ColSet())
+	b.recordJoinType(joinType)
+	b.recordJoinAlgorithm(exec.MergeJoin)
 	ep.root, err = b.factory.ConstructMergeJoin(
 		joinType,
 		left.root, right.root,
@@ -1554,6 +1565,13 @@ func (b *Builder) buildSetOp(set memo.RelExpr) (execPlan, error) {
 		panic(errors.AssertionFailedf("invalid operator %s", redact.Safe(set.Op())))
 	}
 
+	switch typ {
+	case tree.IntersectOp:
+		b.recordJoinType(descpb.IntersectAllJoin)
+	case tree.ExceptOp:
+		b.recordJoinType(descpb.ExceptAllJoin)
+	}
+
 	hardLimit := uint64(0)
 	if set.Op() == opt.LocalityOptimizedSearchOp {
 		if !b.disableTelemetry {
@@ -1580,11 +1598,17 @@ func (b *Builder) buildSetOp(set memo.RelExpr) (execPlan, error) {
 	if typ == tree.UnionOp && all {
 		ep.root, err = b.factory.ConstructUnionAll(left.root, right.root, reqOrdering, hardLimit)
 	} else if len(streamingOrdering) > 0 {
+		if typ != tree.UnionOp {
+			b.recordJoinAlgorithm(exec.MergeJoin)
+		}
 		ep.root, err = b.factory.ConstructStreamingSetOp(typ, all, left.root, right.root, streamingOrdering, reqOrdering)
 	} else {
 		if len(reqOrdering) > 0 {
 			return execPlan{}, errors.AssertionFailedf("hash set op is not supported with a required ordering")
 		}
+		if typ != tree.UnionOp {
+			b.recordJoinAlgorithm(exec.HashJoin)
+		}
 		ep.root, err = b.factory.ConstructHashSetOp(typ, all, left.root, right.root)
 	}
 	if err != nil {
@@ -1738,6 +1762,7 @@ func (b *Builder) buildIndexJoin(join *memo.IndexJoinExpr) (execPlan, error) {
 	cols := join.Cols
 	needed, output := b.getColumns(cols, join.Table)
 	res := execPlan{outputCols: output}
+	b.recordJoinAlgorithm(exec.IndexJoin)
 	res.root, err = b.factory.ConstructIndexJoin(
 		input.root, tab, keyCols, needed, res.reqOrdering(join), join.RequiredPhysical().LimitHintInt64(),
 	)
@@ -1833,8 +1858,11 @@ func (b *Builder) buildLookupJoin(join *memo.LookupJoinExpr) (execPlan, error) {
 		locking = forUpdateLocking
 	}
 
+	joinType := joinOpToJoinType(join.JoinType)
+	b.recordJoinType(joinType)
+	b.recordJoinAlgorithm(exec.LookupJoin)
 	res.root, err = b.factory.ConstructLookupJoin(
-		joinOpToJoinType(join.JoinType),
+		joinType,
 		input.root,
 		tab,
 		idx,
@@ -1943,8 +1971,11 @@ func (b *Builder) buildInvertedJoin(join *memo.InvertedJoinExpr) (execPlan, erro
 		return execPlan{}, err
 	}
 
+	joinType := joinOpToJoinType(join.JoinType)
+	b.recordJoinType(joinType)
+	b.recordJoinAlgorithm(exec.InvertedJoin)
 	res.root, err = b.factory.ConstructInvertedJoin(
-		joinOpToJoinType(join.JoinType),
+		joinType,
 		invertedExpr,
 		input.root,
 		tab,
@@ -2019,6 +2050,7 @@ func (b *Builder) buildZigzagJoin(join *memo.ZigzagJoinExpr) (execPlan, error) {
 		return execPlan{}, err
 	}
 
+	b.recordJoinAlgorithm(exec.ZigZagJoin)
 	res.root, err = b.factory.ConstructZigzagJoin(
 		leftTable,
 		leftIndex,
@@ -2635,6 +2667,34 @@ func (b *Builder) statementTag(expr memo.RelExpr) string {
 	}
 }
 
+// recordJoinType increments the counter for the given join type for telemetry
+// reporting.
+func (b *Builder) recordJoinType(joinType descpb.JoinType) {
+	if b.JoinTypeCounts == nil {
+		const numJoinTypes = 7
+		b.JoinTypeCounts = make(map[descpb.JoinType]int, numJoinTypes)
+	}
+	// Don't bother distinguishing between left and right.
+	switch joinType {
+	case descpb.RightOuterJoin:
+		joinType = descpb.LeftOuterJoin
+	case descpb.RightSemiJoin:
+		joinType = descpb.LeftSemiJoin
+	case descpb.RightAntiJoin:
+		joinType = descpb.LeftAntiJoin
+	}
+	b.JoinTypeCounts[joinType]++
+}
+
+// recordJoinAlgorithm increments the counter for the given join algorithm for
+// telemetry reporting.
+func (b *Builder) recordJoinAlgorithm(joinAlgorithm exec.JoinAlgorithm) {
+	if b.JoinAlgorithmCounts == nil {
+		b.JoinAlgorithmCounts = make(map[exec.JoinAlgorithm]int, exec.NumJoinAlgorithms)
+	}
+	b.JoinAlgorithmCounts[joinAlgorithm]++
+}
+
 // boundedStalenessAllowList contains the operators that may be used with
 // bounded staleness queries.
 var boundedStalenessAllowList = map[opt.Operator]struct{}{

pkg/sql/opt/exec/factory.go

@@ -360,3 +360,19 @@ const (
 	// Streaming means that the grouping columns are fully ordered.
 	Streaming
 )
+
+// JoinAlgorithm is the type of join algorithm used.
+type JoinAlgorithm int8
+
+// The following are all the supported join algorithms.
+const (
+	HashJoin JoinAlgorithm = iota
+	CrossJoin
+	IndexJoin
+	LookupJoin
+	MergeJoin
+	InvertedJoin
+	ApplyJoin
+	ZigZagJoin
+	NumJoinAlgorithms
+)

pkg/sql/plan_opt.go

@@ -624,6 +624,8 @@ func (opc *optPlanningCtx) runExecBuilder(
 		planTop.instrumentation.maxFullScanRows = bld.MaxFullScanRows
 		planTop.instrumentation.totalScanRows = bld.TotalScanRows
 		planTop.instrumentation.nanosSinceStatsCollected = bld.NanosSinceStatsCollected
+		planTop.instrumentation.joinTypeCounts = bld.JoinTypeCounts
+		planTop.instrumentation.joinAlgorithmCounts = bld.JoinAlgorithmCounts
 	} else {
 		// Create an explain factory and record the explain.Plan.
 		explainFactory := explain.NewFactory(f)
@@ -645,6 +647,8 @@ func (opc *optPlanningCtx) runExecBuilder(
 		planTop.instrumentation.maxFullScanRows = bld.MaxFullScanRows
 		planTop.instrumentation.totalScanRows = bld.TotalScanRows
 		planTop.instrumentation.nanosSinceStatsCollected = bld.NanosSinceStatsCollected
+		planTop.instrumentation.joinTypeCounts = bld.JoinTypeCounts
+		planTop.instrumentation.joinAlgorithmCounts = bld.JoinAlgorithmCounts
 
 		planTop.instrumentation.RecordExplainPlan(explainPlan)
 	}