Add strip demo.

internal/config/config.go

@@ -37,6 +37,7 @@ type Config struct {
 	Tables   Tables     `json:"tables" yaml:"tables"`
 	Statsd   *StatsD    `json:"statsd,omitempty" yaml:"statsd" env:"STATSD"`
 	Computed []Computed `json:"computed" yaml:"computed" env:"COMPUTED"`
+	Filters  []Computed `json:"filters" yaml:"filters" env:"FILTERS"`
 	K8s      *K8s       `json:"k8s,omitempty" yaml:"k8s" env:"K8S"`
 }
 

internal/encoding/block/strip.go

@@ -0,0 +1,58 @@
+// Copyright 2019-2020 Grabtaxi Holdings PTE LTE (GRAB), All rights reserved.
+// Use of this source code is governed by an MIT-style license that can be found in the LICENSE file
+
+package block
+
+import (
+	"github.com/kelindar/talaria/internal/column/computed"
+	"github.com/kelindar/talaria/internal/encoding/typeof"
+)
+
+// Strip runs the computed Values and overwrites/appends them to the set.
+func Strip(filter *typeof.Schema, computed ...computed.Computed) applyFunc {
+	return func(r Row) (Row, error) {
+		for _, c := range computed {
+			v, err := c.Value(r.Values)
+			if err != nil || v == nil {
+				continue
+			}
+			if v.(bool) == true {
+				if r.Values["bch"] == "test" {
+					out := NewRow(nil, 0)
+					return out, nil
+				}
+			}
+		}
+
+		return r, nil
+		// // Create a new output row and copy the column values from the input
+		// schema := make(typeof.Schema, len(r.Schema))
+		// out := NewRow(schema, len(r.Values)+len(computed))
+		// for k, v := range r.Values {
+		// 	if filter == nil || filter.HasConvertible(k, r.Schema[k]) {
+		// 		out.Values[k] = v
+		// 		out.Schema[k] = r.Schema[k]
+		// 	}
+		// }
+
+		// // Compute the Values
+		// for _, c := range computed {
+		// 	if filter != nil && !filter.Contains(c.Name(), c.Type()) {
+		// 		continue // Skip computed Values which aren't part of the filter
+		// 	}
+
+		// 	// Compute the column
+		// 	// v, err := c.Value(r.Values)
+		// 	// if err != nil || v == nil {
+		// 	// 	continue
+		// 	// }
+
+		// 	// If the column with the same name is already present in the input row,
+		// 	// we need to overwrite this column and set a new type.
+		// 	// out.Schema[c.Name()] = c.Type()
+		// 	delete(out.Schema, "")
+		// 	delete(out.Values, "")
+		// }
+		// return out, nil
+	}
+}

internal/encoding/merge/orc.go

@@ -13,6 +13,9 @@ import (
 
 // ToOrc merges multiple blocks together and outputs a key and merged orc data
 func ToOrc(blocks []block.Block, schema typeof.Schema) ([]byte, error) {
+	if len(schema) == 0 {
+		return nil, nil
+	}
 	orcSchema, err := orc.SchemaFor(schema)
 	if err != nil {
 		return nil, errors.Internal("merge: error generating orc schema", err)

internal/server/server.go

@@ -66,6 +66,18 @@ func New(conf config.Func, monitor monitor.Monitor, tables ...table.Table) *Serv
 		server.computed = append(server.computed, col)
 	}
 
+	// Load filter columns
+	for _, c := range conf().Filters {
+		col, err := computed.NewComputed(c.Name, c.FuncName, c.Type, c.Func, monitor)
+		if err != nil {
+			monitor.Error(err)
+			continue
+		}
+
+		monitor.Info("server: loaded filter %v of type %v", c.Name, c.Type)
+		server.filter = append(server.filter, col)
+	}
+
 	// Register the gRPC servers
 	talaria.RegisterIngressServer(server.server, server)
 	talaria.RegisterQueryServer(server.server, server)
@@ -86,6 +98,7 @@ type Server struct {
 	cancel   context.CancelFunc     // The cancellation function for the server
 	tables   map[string]table.Table // The list of tables
 	computed []computed.Computed    // The set of computed columns
+	filter   []computed.Computed    // The set of filters
 	s3sqs    *s3sqs.Ingress         // The S3SQS Ingress (optional)
 }
 

internal/server/server_ingest.go

@@ -39,7 +39,7 @@ func (s *Server) Ingest(ctx context.Context, request *talaria.IngestRequest) (*t
 		}
 
 		// Functions to be applied
-		funcs := []applyFunc{block.Transform(filter, s.computed...)}
+		funcs := []applyFunc{block.Strip(filter, s.filter...), block.Transform(filter, s.computed...)}
 
 		// If table supports streaming, add publishing function
 		if streamer, ok := t.(storage.Streamer); ok {