Merge #105477 #108139

105477: sql: add plan gist matching to stmt diagnostics feature r=yuzefovich a=yuzefovich

This commit extends the stmt diagnostics feature to add optional
plan-gist-based matching. Previously, we filtered statements based only
on the fingerprint but now we can optionally ask for a particular plan
(by specifying the target plan gist). All other aspects of the feature
(minimum execution latency, sampling probability) are unaffected.

The caveat to the implementation is that the plan gist of the running
statement is available after the optimizer has done its part, so
whenever plan-gist-based matching is desired, the trace will not
include the optimizer part as well as the plan string won't be
available.

This commit also made a minor change to always store the memo and the
opt planning catalog in `planTop`. Previously, this was stored only when
the bundle collection is enabled, but we now can enable it after the
optimizer, at which point the memo and the catalog might be lost. The
optimizer now stores it unconditionally, but then if we choose to not
collect the bundle once the plan gist is available, we release these
things. This allows us to still get `opt` files in the bundle.

Epic: None
Addresses: #96765.
Addresses: #103018.

Release note (sql change): Statement diagnostics feature has been
extended to support collecting a bundle for a particular plan. Namely,
the existing fingerprint-based matching has been extended to also
include plan-gist-based matching. Such bundle will miss a couple of
things: `plan.txt` file as well as the tracing of the optimizer. At
the moment, the feature is only exposed via an overload to
`crdb_internal.request_statement_bundle` builtin function. We now also
support "anti-match" - i.e. collecting a bundle for any plan other than
the provided plan gist.

108139: sql: fix logic to collect stats on system.jobs r=rytaft a=rytaft

This commit fixes an oversight in #102637 which intended to enable stats collection on the jobs table, but was not successful.

I've manually confirmed that stats are now collected on the jobs table in a local cluster:
```
  888074673664065537 | AUTO CREATE STATS               | Table statistics refresh for system.public.jobs                         | CREATE STATISTICS __auto__ FROM [15] WITH OPTIONS THROTTLING 0.9 AS OF SYSTEM TIME '-30s'  | root      | succeeded | NULL           | 2023-08-03 19:01:22.343
```

Informs #107405

Release note (performance improvement): We now automatically collect table statistics on the `system.jobs` table, which will enable the optimizer to produce better query plans for internal queries that access the `system.jobs` table. This may result in better performance of the system. Note: a previous attempt to enable stats on `system.jobs` starting in 23.1.0 was unsuccessful, but we have now fixed the oversight.

Co-authored-by: Yahor Yuzefovich <[email protected]>
Co-authored-by: Rebecca Taft <[email protected]>

docs/generated/http/full.md

@@ -4388,6 +4388,8 @@ Support status: [reserved](#support-status)
 | min_execution_latency | [google.protobuf.Duration](#cockroach.server.serverpb.CreateStatementDiagnosticsReportRequest-google.protobuf.Duration) |  | MinExecutionLatency, when non-zero, indicates the minimum execution latency of a query for which to collect the diagnostics report. In other words, if a query executes faster than this threshold, then the diagnostics report is not collected on it, and we will try to get a bundle the next time we see the query fingerprint.<br><br>NB: if MinExecutionLatency is non-zero, then all queries that match the fingerprint will be traced until a slow enough query comes along. This tracing might have some performance overhead. | [reserved](#support-status) |
 | expires_after | [google.protobuf.Duration](#cockroach.server.serverpb.CreateStatementDiagnosticsReportRequest-google.protobuf.Duration) |  | ExpiresAfter, when non-zero, sets the expiration interval of this request. | [reserved](#support-status) |
 | sampling_probability | [double](#cockroach.server.serverpb.CreateStatementDiagnosticsReportRequest-double) |  | SamplingProbability controls how likely we are to try and collect a diagnostics report for a given execution. The semantics with MinExecutionLatency are worth noting (and perhaps simplifying?): - If SamplingProbability is zero, we're always sampling. This is for   compatibility with pre-22.2 versions where this parameter was not   available. - If SamplingProbability is non-zero, MinExecutionLatency must be non-zero.   We'll sample stmt executions with the given probability until:   (a) we capture one that exceeds MinExecutionLatency, or   (b) we hit the ExpiresAfter point.<br><br>SamplingProbability lets users control at a per-stmt granularity how much collection overhead is acceptable to try an capture an outlier execution for further analysis (are high p99.9s due to latch waits? racing with split transfers?). A high sampling rate can capture a trace sooner, but the added overhead may also cause the trace to be non-representative if the tracing overhead across all requests is causing resource saturation (network, memory) and resulting in slowdown.<br><br>TODO(irfansharif): Wire this up to the UI code. When selecting the latency threshold, we should want to force specifying a sampling probability.<br><br>TODO(irfansharif): We could do better than a hard-coded default value for probability (100% could be too high-overhead so probably not the right one). Strawman: could consider the recent request rate for the fingerprint (say averaged over the last 10m? 30m?), consider what %-ile the latency target we're looking to capture is under, and suggest a sampling probability that gets you at least one trace in the next T seconds with 95% likelihood? Or provide a hint for how long T is for the currently chosen sampling probability. | [reserved](#support-status) |
+| plan_gist | [string](#cockroach.server.serverpb.CreateStatementDiagnosticsReportRequest-string) |  | PlanGist, when set, indicates a particular plan that we want collect diagnostics for. This can be useful when a single fingerprint can result in multiple plans.<br><br>There is a caveat to using this filtering: since the plan gist for a running query is only available after the optimizer has done its part, the trace will only include things after the optimizer is done. | [reserved](#support-status) |
+| anti_plan_gist | [bool](#cockroach.server.serverpb.CreateStatementDiagnosticsReportRequest-bool) |  | AntiPlanGist, when set, indicates that any plan not matching PlanGist will do. | [reserved](#support-status) |
 
 
 

docs/generated/settings/settings-for-tenants.txt

@@ -304,4 +304,4 @@ trace.opentelemetry.collector	string		address of an OpenTelemetry trace collecto
 trace.snapshot.rate	duration	0s	if non-zero, interval at which background trace snapshots are captured	tenant-rw
 trace.span_registry.enabled	boolean	true	if set, ongoing traces can be seen at https://<ui>/#/debug/tracez	tenant-rw
 trace.zipkin.collector	string		the address of a Zipkin instance to receive traces, as <host>:<port>. If no port is specified, 9411 will be used.	tenant-rw
-version	version	1000023.1-16	set the active cluster version in the format '<major>.<minor>'	tenant-rw
+version	version	1000023.1-18	set the active cluster version in the format '<major>.<minor>'	tenant-rw

docs/generated/settings/settings.html

@@ -260,6 +260,6 @@
 <tr><td><div id="setting-trace-span-registry-enabled" class="anchored"><code>trace.span_registry.enabled</code></div></td><td>boolean</td><td><code>true</code></td><td>if set, ongoing traces can be seen at https://&lt;ui&gt;/#/debug/tracez</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
 <tr><td><div id="setting-trace-zipkin-collector" class="anchored"><code>trace.zipkin.collector</code></div></td><td>string</td><td><code></code></td><td>the address of a Zipkin instance to receive traces, as &lt;host&gt;:&lt;port&gt;. If no port is specified, 9411 will be used.</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
 <tr><td><div id="setting-ui-display-timezone" class="anchored"><code>ui.display_timezone</code></div></td><td>enumeration</td><td><code>etc/utc</code></td><td>the timezone used to format timestamps in the ui [etc/utc = 0, america/new_york = 1]</td><td>Dedicated/Self-Hosted</td></tr>
-<tr><td><div id="setting-version" class="anchored"><code>version</code></div></td><td>version</td><td><code>1000023.1-16</code></td><td>set the active cluster version in the format &#39;&lt;major&gt;.&lt;minor&gt;&#39;</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
+<tr><td><div id="setting-version" class="anchored"><code>version</code></div></td><td>version</td><td><code>1000023.1-18</code></td><td>set the active cluster version in the format &#39;&lt;major&gt;.&lt;minor&gt;&#39;</td><td>Serverless/Dedicated/Self-Hosted</td></tr>
 </tbody>
 </table>

pkg/cli/clisqlclient/statement_diag.go

@@ -102,8 +102,13 @@ func stmtDiagListBundlesInternal(ctx context.Context, conn Conn) ([]StmtDiagBund
 type StmtDiagActivationRequest struct {
 	ID int64
 	// Statement is the SQL statement fingerprint.
-	Statement   string
-	RequestedAt time.Time
+	Statement string
+	// If empty then any plan will do.
+	PlanGist string
+	// If true and PlanGist is not empty, then any plan not matching the gist
+	// will do.
+	AntiPlanGist bool
+	RequestedAt  time.Time
 	// Zero value indicates that there is no sampling probability set on the
 	// request.
 	SamplingProbability float64
@@ -127,17 +132,16 @@ func StmtDiagListOutstandingRequests(
 	return result, nil
 }
 
-// TODO(irfansharif): Remove this in 23.1.
-func isAtLeast22dot2ClusterVersion(ctx context.Context, conn Conn) (bool, error) {
-	// Check whether the upgrade to add the sampling_probability column to the
-	// statement_diagnostics_requests system table has already been run.
+func isAtLeast23dot2ClusterVersion(ctx context.Context, conn Conn) (bool, error) {
+	// Check whether the upgrade to add the plan_gist and anti_plan_gist columns
+	// to the statement_diagnostics_requests system table has already been run.
 	row, err := conn.QueryRow(ctx, `
  SELECT
    count(*)
  FROM
    [SHOW COLUMNS FROM system.statement_diagnostics_requests]
  WHERE
-   column_name = 'sampling_probability';`)
+   column_name = 'plan_gist';`)
 	if err != nil {
 		return false, err
 	}
@@ -152,12 +156,12 @@ func stmtDiagListOutstandingRequestsInternal(
 	ctx context.Context, conn Conn,
 ) ([]StmtDiagActivationRequest, error) {
 	var extraColumns string
-	atLeast22dot2, err := isAtLeast22dot2ClusterVersion(ctx, conn)
+	atLeast23dot2, err := isAtLeast23dot2ClusterVersion(ctx, conn)
 	if err != nil {
 		return nil, err
 	}
-	if atLeast22dot2 {
-		extraColumns = ", sampling_probability"
+	if atLeast23dot2 {
+		extraColumns = ", plan_gist, anti_plan_gist"
 	}
 
 	// Converting an INTERVAL to a number of milliseconds within that interval
@@ -169,7 +173,7 @@ func stmtDiagListOutstandingRequestsInternal(
                         EXTRACT(millisecond FROM min_execution_latency)::INT8 -
                         EXTRACT(second FROM min_execution_latency)::INT8 * 1000`
 	rows, err := conn.Query(ctx,
-		fmt.Sprintf("SELECT id, statement_fingerprint, requested_at, "+getMilliseconds+`, expires_at%s
+		fmt.Sprintf("SELECT id, statement_fingerprint, requested_at, "+getMilliseconds+`, expires_at, sampling_probability%s
 			FROM system.statement_diagnostics_requests
 			WHERE NOT completed
 			ORDER BY requested_at DESC`, extraColumns),
@@ -178,7 +182,7 @@ func stmtDiagListOutstandingRequestsInternal(
 		return nil, err
 	}
 	var result []StmtDiagActivationRequest
-	vals := make([]driver.Value, 6)
+	vals := make([]driver.Value, 8)
 	for {
 		if err := rows.Next(vals); err == io.EOF {
 			break
@@ -188,21 +192,31 @@ func stmtDiagListOutstandingRequestsInternal(
 		var minExecutionLatency time.Duration
 		var expiresAt time.Time
 		var samplingProbability float64
+		var planGist string
+		var antiPlanGist bool
 
 		if ms, ok := vals[3].(int64); ok {
 			minExecutionLatency = time.Millisecond * time.Duration(ms)
 		}
 		if e, ok := vals[4].(time.Time); ok {
 			expiresAt = e
 		}
-		if atLeast22dot2 {
-			if sp, ok := vals[5].(float64); ok {
-				samplingProbability = sp
+		if sp, ok := vals[5].(float64); ok {
+			samplingProbability = sp
+		}
+		if atLeast23dot2 {
+			if gist, ok := vals[6].(string); ok {
+				planGist = gist
+			}
+			if antiGist, ok := vals[7].(bool); ok {
+				antiPlanGist = antiGist
 			}
 		}
 		info := StmtDiagActivationRequest{
 			ID:                  vals[0].(int64),
 			Statement:           vals[1].(string),
+			PlanGist:            planGist,
+			AntiPlanGist:        antiPlanGist,
 			RequestedAt:         vals[2].(time.Time),
 			SamplingProbability: samplingProbability,
 			MinExecutionLatency: minExecutionLatency,

pkg/cli/statement_diag.go

@@ -85,7 +85,7 @@ func runStmtDiagList(cmd *cobra.Command, args []string) (resErr error) {
 	} else {
 		fmt.Printf("Outstanding activation requests:\n")
 		w := tabwriter.NewWriter(&buf, 4, 0, 2, ' ', 0)
-		fmt.Fprint(w, "  ID\tActivation time\tStatement\tSampling probability\tMin execution latency\tExpires at\n")
+		fmt.Fprint(w, "  ID\tActivation time\tStatement\tPlan gist\tAnti plan gist\tSampling probability\tMin execution latency\tExpires at\n")
 		for _, r := range reqs {
 			minExecLatency := "N/A"
 			if r.MinExecutionLatency != 0 {
@@ -102,8 +102,8 @@ func runStmtDiagList(cmd *cobra.Command, args []string) (resErr error) {
 				samplingProbability = fmt.Sprintf("%0.4f", r.SamplingProbability)
 			}
 			fmt.Fprintf(
-				w, "  %d\t%s\t%s\t%s\t%s\t%s\n",
-				r.ID, r.RequestedAt.UTC().Format(timeFmt), r.Statement, samplingProbability, minExecLatency, expiresAt,
+				w, "  %d\t%s\t%s\t%s\t%t\t%s\t%s\t%s\n",
+				r.ID, r.RequestedAt.UTC().Format(timeFmt), r.Statement, r.PlanGist, r.AntiPlanGist, samplingProbability, minExecLatency, expiresAt,
 			)
 		}
 		_ = w.Flush()

pkg/cli/statement_diag_test.go

@@ -31,13 +31,15 @@ func Example_statement_diag() {
 		        (20, 'SELECT _ FROM _ WHERE _ > _', 'SELECT a FROM t WHERE b > 1', '2010-01-02 03:04:06', ARRAY[1001,1002,1003]),
 		        (30, 'SELECT _ FROM _ WHERE _ > _', 'SELECT a FROM t WHERE b > 1', '2010-01-02 03:04:07', ARRAY[1001])`,
 
-		`INSERT INTO system.statement_diagnostics_requests(id, completed, statement_fingerprint, statement_diagnostics_id, requested_at, sampling_probability, min_execution_latency, expires_at)
-		 VALUES (1, TRUE, 'SELECT _ FROM _', 10, '2010-01-02 03:04:00', NULL, NULL, NULL),
-		        (2, TRUE, 'SELECT _ FROM _ WHERE _ > _', 20, '2010-01-02 03:04:02', 0.5, NULL, NULL),
-		        (3, TRUE, 'SELECT _ FROM _ WHERE _ > _', 30, '2010-01-02 03:04:05', 1.0, NULL, NULL),
-		        (4, FALSE, 'SELECT _ + _', NULL, '2010-01-02 03:04:10', 0.8, '1d 2h 3m 4s 5ms 6us', NULL),
-		        (5, FALSE, 'SELECT _ - _', NULL, '2010-01-02 03:04:11', 1.0, NULL, '2030-01-02 03:04:12'),
-		        (6, FALSE, 'SELECT _ / _', NULL, '2010-01-02 03:04:12', NULL, '0s', NULL)`,
+		`INSERT INTO system.statement_diagnostics_requests(
+                     id, completed, statement_fingerprint, plan_gist, anti_plan_gist, statement_diagnostics_id,
+                     requested_at, sampling_probability, min_execution_latency, expires_at)
+		 VALUES (1, TRUE, 'SELECT _ FROM _', '', NULL, 10, '2010-01-02 03:04:00', NULL, NULL, NULL),
+		        (2, TRUE, 'SELECT _ FROM _ WHERE _ > _', '', NULL, 20, '2010-01-02 03:04:02', 0.5, NULL, NULL),
+		        (3, TRUE, 'SELECT _ FROM _ WHERE _ > _', '', NULL, 30, '2010-01-02 03:04:05', 1.0, NULL, NULL),
+		        (4, FALSE, 'SELECT _ + _', '', NULL, NULL, '2010-01-02 03:04:10', 0.8, '1d 2h 3m 4s 5ms 6us', NULL),
+		        (5, FALSE, 'SELECT _ - _', 'foo', false, NULL, '2010-01-02 03:04:11', 1.0, NULL, '2030-01-02 03:04:12'),
+		        (6, FALSE, 'SELECT _ / _', 'bar', true, NULL, '2010-01-02 03:04:12', NULL, '0s', NULL)`,
 	}
 
 	for _, cmd := range commands {
@@ -94,10 +96,10 @@ func Example_statement_diag() {
 	//   10  2010-01-02 03:04:05 UTC  SELECT _ FROM _
 	//
 	// Outstanding activation requests:
-	//   ID  Activation time          Statement     Sampling probability  Min execution latency  Expires at
-	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  1.0000                N/A                    never
-	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
-	//   4   2010-01-02 03:04:10 UTC  SELECT _ + _  0.8000                26h3m4.005s            never
+	//   ID  Activation time          Statement     Plan gist  Anti plan gist  Sampling probability  Min execution latency  Expires at
+	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  bar        true            1.0000                N/A                    never
+	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  foo        false           1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
+	//   4   2010-01-02 03:04:10 UTC  SELECT _ + _             false           0.8000                26h3m4.005s            never
 	// statement-diag download 13
 	// ERROR: failed to download statement diagnostics bundle 13 to 'stmt-bundle-13.zip': no statement diagnostics bundle with ID 13
 	// statement-diag download 20 tempfile.zip
@@ -120,18 +122,18 @@ func Example_statement_diag() {
 	//   20  2010-01-02 03:04:06 UTC  SELECT _ FROM _ WHERE _ > _
 	//
 	// Outstanding activation requests:
-	//   ID  Activation time          Statement     Sampling probability  Min execution latency  Expires at
-	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  1.0000                N/A                    never
-	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
-	//   4   2010-01-02 03:04:10 UTC  SELECT _ + _  0.8000                26h3m4.005s            never
+	//   ID  Activation time          Statement     Plan gist  Anti plan gist  Sampling probability  Min execution latency  Expires at
+	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  bar        true            1.0000                N/A                    never
+	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  foo        false           1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
+	//   4   2010-01-02 03:04:10 UTC  SELECT _ + _             false           0.8000                26h3m4.005s            never
 	// statement-diag delete --all
 	// statement-diag list
 	// No statement diagnostics bundles available.
 	// Outstanding activation requests:
-	//   ID  Activation time          Statement     Sampling probability  Min execution latency  Expires at
-	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  1.0000                N/A                    never
-	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
-	//   4   2010-01-02 03:04:10 UTC  SELECT _ + _  0.8000                26h3m4.005s            never
+	//   ID  Activation time          Statement     Plan gist  Anti plan gist  Sampling probability  Min execution latency  Expires at
+	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  bar        true            1.0000                N/A                    never
+	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  foo        false           1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
+	//   4   2010-01-02 03:04:10 UTC  SELECT _ + _             false           0.8000                26h3m4.005s            never
 	// statement-diag cancel xx
 	// ERROR: invalid ID
 	// statement-diag cancel 5 6
@@ -142,9 +144,9 @@ func Example_statement_diag() {
 	// statement-diag list
 	// No statement diagnostics bundles available.
 	// Outstanding activation requests:
-	//   ID  Activation time          Statement     Sampling probability  Min execution latency  Expires at
-	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  1.0000                N/A                    never
-	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
+	//   ID  Activation time          Statement     Plan gist  Anti plan gist  Sampling probability  Min execution latency  Expires at
+	//   6   2010-01-02 03:04:12 UTC  SELECT _ / _  bar        true            1.0000                N/A                    never
+	//   5   2010-01-02 03:04:11 UTC  SELECT _ - _  foo        false           1.0000                N/A                    2030-01-02 03:04:12 +0000 UTC
 	// statement-diag cancel 123
 	// ERROR: no outstanding activation request with ID 123
 	// statement-diag cancel --all

pkg/cli/zip_table_registry.go

@@ -1232,6 +1232,8 @@ var zipSystemTables = DebugZipTableRegistry{
 			"min_execution_latency",
 			"expires_at",
 			"sampling_probability",
+			"plan_gist",
+			"anti_plan_gist",
 		},
 	},
 	"system.table_statistics": {

pkg/clusterversion/cockroach_versions.go

@@ -201,10 +201,6 @@ const (
 	TODODelete_V22_2RemoveGrantPrivilege
 	// TODODelete_V22_2MVCCRangeTombstones enables the use of MVCC range tombstones.
 	TODODelete_V22_2MVCCRangeTombstones
-	// TODODelete_V22_2SampledStmtDiagReqs enables installing statement diagnostic requests that
-	// probabilistically collects stmt bundles, controlled by the user provided
-	// sampling rate.
-	TODODelete_V22_2SampledStmtDiagReqs
 	// TODODelete_V22_2SystemPrivilegesTable adds system.privileges table.
 	TODODelete_V22_2SystemPrivilegesTable
 	// TODODelete_V22_2EnablePredicateProjectionChangefeed indicates that changefeeds support
@@ -557,6 +553,10 @@ const (
 	// FormatVirtualSSTables, allowing use of virtual sstables in Pebble.
 	V23_2_PebbleFormatVirtualSSTables
 
+	// V23_2_StmtDiagForPlanGist enables statement diagnostic feature to collect
+	// the bundle for particular plan gist.
+	V23_2_StmtDiagForPlanGist
+
 	// *************************************************
 	// Step (1) Add new versions here.
 	// Do not add new versions to a patch release.
@@ -650,10 +650,6 @@ var rawVersionsSingleton = keyedVersions{
 		Key:     TODODelete_V22_2MVCCRangeTombstones,
 		Version: roachpb.Version{Major: 22, Minor: 1, Internal: 16},
 	},
-	{
-		Key:     TODODelete_V22_2SampledStmtDiagReqs,
-		Version: roachpb.Version{Major: 22, Minor: 1, Internal: 20},
-	},
 	{
 		Key:     TODODelete_V22_2SystemPrivilegesTable,
 		Version: roachpb.Version{Major: 22, Minor: 1, Internal: 24},
@@ -970,6 +966,10 @@ var rawVersionsSingleton = keyedVersions{
 		Key:     V23_2_PebbleFormatVirtualSSTables,
 		Version: roachpb.Version{Major: 23, Minor: 1, Internal: 16},
 	},
+	{
+		Key:     V23_2_StmtDiagForPlanGist,
+		Version: roachpb.Version{Major: 23, Minor: 1, Internal: 18},
+	},
 
 	// *************************************************
 	// Step (2): Add new versions here.

pkg/server/serverpb/status.proto

@@ -1800,6 +1800,17 @@ message CreateStatementDiagnosticsReportRequest {
   // likelihood? Or provide a hint for how long T is for the currently chosen
   // sampling probability.
   double sampling_probability = 4;
+  // PlanGist, when set, indicates a particular plan that we want collect
+  // diagnostics for. This can be useful when a single fingerprint can result in
+  // multiple plans.
+  //
+  // There is a caveat to using this filtering: since the plan gist for a
+  // running query is only available after the optimizer has done its part, the
+  // trace will only include things after the optimizer is done.
+  string plan_gist = 5;
+  // AntiPlanGist, when set, indicates that any plan not matching PlanGist will
+  // do.
+  bool anti_plan_gist = 6;
 }
 
 message CreateStatementDiagnosticsReportResponse {