DescribeNamespaceRequest describeNamespaceRequest = DescribeNamespaceRequest.newBuilder()
				.setNamespace(namespace).build();

DescribeNamespaceResponse describeNamespaceResponse = workflowServiceBlockingStub
				.describeNamespace(describeNamespaceRequest);
							

SELECT id, name, is_global, data, data_encoding, notification_version FROM namespaces
where WHERE partition_id=$1 AND name = $2

partition_id 是全局常量
const (
	partitionID = 54321
)


temporal/common/persistence/sql/sqlplugin/postgresql/namespace.go
func (pdb *db) selectFromNamespace(
	ctx context.Context,
	filter sqlplugin.NamespaceFilter,
) ([]sqlplugin.NamespaceRow, error) {
	var err error
	var row sqlplugin.NamespaceRow
	switch {
	case filter.ID != nil:
		err = pdb.conn.GetContext(ctx,
			&row,
			getNamespaceByIDQuery,
			partitionID,
			*filter.ID,
		)
	case filter.Name != nil:
		err = pdb.conn.GetContext(ctx,
			&row,
			getNamespaceByNameQuery,
			partitionID,
			*filter.Name,
		)
	}
	if err != nil {
		return nil, err
	}
	return []sqlplugin.NamespaceRow{row}, nil
}



github.com/jmoiron/sqlx.(*DB).GetContext (/Users/dugang/go/pkg/mod/github.com/jmoiron/sqlx@v1.3.4/sqlx_context.go:146)
go.temporal.io/server/common/persistence/sql/sqlplugin/postgresql.(*db).selectFromNamespace (/Users/dugang/dugang/work/temporal/temporal/common/persistence/sql/sqlplugin/postgresql/namespace.go:117)
go.temporal.io/server/common/persistence/sql/sqlplugin/postgresql.(*db).SelectFromNamespace (/Users/dugang/dugang/work/temporal/temporal/common/persistence/sql/sqlplugin/postgresql/namespace.go:94)
go.temporal.io/server/common/persistence/sql.(*DbConn).SelectFromNamespace (Unknown Source:1)
go.temporal.io/server/common/persistence/sql.(*sqlMetadataManagerV2).GetNamespace (/Users/dugang/dugang/work/temporal/temporal/common/persistence/sql/metadata.go:119)
go.temporal.io/server/common/persistence.(*metadataManagerImpl).GetNamespace (/Users/dugang/dugang/work/temporal/temporal/common/persistence/metadata_manager.go:86)
go.temporal.io/server/common/persistence.(*metadataRateLimitedPersistenceClient).GetNamespace (/Users/dugang/dugang/work/temporal/temporal/common/persistence/persistenceRateLimitedClients.go:543)
go.temporal.io/server/common/persistence.(*metadataPersistenceClient).GetNamespace (/Users/dugang/dugang/work/temporal/temporal/common/persistence/persistenceMetricClients.go:765)
go.temporal.io/server/common/namespace.(*HandlerImpl).DescribeNamespace (/Users/dugang/dugang/work/temporal/temporal/common/namespace/handler.go:344)
go.temporal.io/server/service/frontend.(*WorkflowHandler).DescribeNamespace (/Users/dugang/dugang/work/temporal/temporal/service/frontend/workflowHandler.go:298)
go.temporal.io/server/service/frontend.(*DCRedirectionHandlerImpl).DescribeNamespace (/Users/dugang/dugang/work/temporal/temporal/service/frontend/dcRedirectionHandler.go:153)
go.temporal.io/api/workflowservice/v1._WorkflowService_DescribeNamespace_Handler.func1 (/Users/dugang/go/pkg/mod/go.temporal.io/api@v1.7.1-0.20220211205804-a4f685c2448b/workflowservice/v1/service.pb.go:1071)
go.temporal.io/server/common/rpc/interceptor.(*SDKVersionInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/sdk_version.go:63)
go.temporal.io/server/common/rpc/interceptor.(*SDKVersionInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/sdk_version.go:53)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1116)
go.temporal.io/server/common/authorization.(*interceptor).Interceptor (/Users/dugang/dugang/work/temporal/temporal/common/authorization/interceptor.go:152)
go.temporal.io/server/common/authorization.(*interceptor).Interceptor-fm (/Users/dugang/dugang/work/temporal/temporal/common/authorization/interceptor.go:66)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceCountLimitInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_count_limit.go:99)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceCountLimitInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_count_limit.go:76)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceRateLimitInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_rate_limit.go:89)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceRateLimitInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_rate_limit.go:69)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc/interceptor.(*RateLimitInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/rate_limit.go:84)
go.temporal.io/server/common/rpc/interceptor.(*RateLimitInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/rate_limit.go:65)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceValidatorInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_validator.go:113)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceValidatorInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_validator.go:93)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc/interceptor.(*TelemetryInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/telemetry.go:108)
go.temporal.io/server/common/rpc/interceptor.(*TelemetryInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/telemetry.go:91)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/metrics.NewServerMetricsContextInjectorInterceptor.func1 (/Users/dugang/dugang/work/temporal/temporal/common/metrics/grpc.go:66)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc.ServiceErrorInterceptor (/Users/dugang/dugang/work/temporal/temporal/common/rpc/grpc.go:131)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceLogInterceptor).Intercept (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_logger.go:84)
go.temporal.io/server/common/rpc/interceptor.(*NamespaceLogInterceptor).Intercept-fm (/Users/dugang/dugang/work/temporal/temporal/common/rpc/interceptor/namespace_logger.go:57)
google.golang.org/grpc.chainUnaryInterceptors.func1.1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1119)
google.golang.org/grpc.chainUnaryInterceptors.func1 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1121)
go.temporal.io/api/workflowservice/v1._WorkflowService_DescribeNamespace_Handler (/Users/dugang/go/pkg/mod/go.temporal.io/api@v1.7.1-0.20220211205804-a4f685c2448b/workflowservice/v1/service.pb.go:1073)
google.golang.org/grpc.(*Server).processUnaryRPC (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1282)
google.golang.org/grpc.(*Server).handleStream (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:1616)
google.golang.org/grpc.(*Server).serveStreams.func1.2 (/Users/dugang/go/pkg/mod/google.golang.org/grpc@v1.44.0/server.go:921)
runtime.goexit (/usr/local/go/src/runtime/asm_amd64.s:1581)