workload: create statistics when making fixtures

`workload make` imports a workload and then creates the backup (that
can be later used by `workload load`).

This change adds functionality to call CREATE STATISTICS on all tables
before creating the backup. This can be turned off using a flag.

Release note: None

pkg/ccl/workloadccl/cliccl/fixtures.go

@@ -47,6 +47,7 @@ func config() workloadccl.FixtureConfig {
 		config.BillingProject = *gcsBillingProjectOverride
 	}
 	config.CSVServerURL = *fixturesMakeImportCSVServerURL
+	config.TableStats = *fixturesMakeTableStats
 	return config
 }
 
@@ -91,6 +92,10 @@ var fixturesMakeFilesPerNode = fixturesMakeCmd.PersistentFlags().Int(
 	`files-per-node`, 1,
 	`number of file URLs to generate per node when using csv-server`)
 
+var fixturesMakeTableStats = fixturesMakeCmd.PersistentFlags().Bool(
+	`table-stats`, true,
+	`generate full table statistics for all tables`)
+
 var fixturesImportFilesPerNode = fixturesImportCmd.PersistentFlags().Int(
 	`files-per-node`, 1,
 	`number of file URLs to generate per node`)

pkg/ccl/workloadccl/fixture.go

@@ -60,6 +60,10 @@ type FixtureConfig struct {
 	// storage requests. This is required to be set if using a "requestor pays"
 	// bucket.
 	BillingProject string
+
+	// If TableStats is true, CREATE STATISTICS is called on all tables before
+	// crating the fixture.
+	TableStats bool
 }
 
 func (s FixtureConfig) objectPathToURI(folder string) string {
@@ -279,6 +283,28 @@ func MakeFixture(
 		return Fixture{}, err
 	}
 
+	if config.TableStats {
+		// Clean up any existing statistics.
+		_, err := sqlDB.Exec("DELETE FROM system.table_statistics WHERE true")
+		if err != nil {
+			return Fixture{}, errors.Wrapf(err, "while deleting table statistics")
+		}
+		g := ctxgroup.WithContext(ctx)
+		for _, t := range gen.Tables() {
+			t := t
+			g.Go(func() error {
+				log.Infof(ctx, "Creating table stats for %s", t.Name)
+				_, err := sqlDB.Exec(fmt.Sprintf(
+					`CREATE STATISTICS pre_backup FROM "%s"."%s"`, dbName, t.Name,
+				))
+				return err
+			})
+		}
+		if err := g.Wait(); err != nil {
+			return Fixture{}, err
+		}
+	}
+
 	g := ctxgroup.WithContext(ctx)
 	for _, t := range gen.Tables() {
 		t := t