Add Table.Description, Table.CreatedAt, Field.CreatedAt support to SchemaAPI (#2340)

* Thread Table.Description through SchemaAPI

* Thread Table.CreatedAt through SchemaAPI

* Thread Field.CreatedAt through SchemaAPI

dax/mds/schemar/boltdb/schemar.go

@@ -8,6 +8,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"strings"
+	"time"
 
 	"github.com/molecula/featurebase/v3/dax"
 	"github.com/molecula/featurebase/v3/dax/boltdb"
@@ -61,6 +62,18 @@ func (s *Schemar) CreateTable(ctx context.Context, qtbl *dax.QualifiedTable) err
 		return schemar.NewErrInvalidPrimaryKey()
 	}
 
+	// Set the CreateAt value for the table.
+	// TODO(tlt): We may want to consider erroring here if the value is != 0.
+	if qtbl.CreatedAt == 0 {
+		now := timestamp()
+		qtbl.CreatedAt = now
+
+		// Set CreatedAt for all of the fields as well.
+		for i := range qtbl.Fields {
+			qtbl.Fields[i].CreatedAt = now
+		}
+	}
+
 	//////////// end validation
 
 	tx, err := s.db.BeginTx(ctx, true)
@@ -384,3 +397,7 @@ func (s *Schemar) TableID(ctx context.Context, qual dax.TableQualifier, name dax
 
 	return s.tableIDByName(tx, qual, name)
 }
+
+func timestamp() int64 {
+	return time.Now().UnixNano()
+}

dax/table.go

@@ -162,6 +162,9 @@ type Table struct {
 	Name       TableName `json:"name,omitempty"`
 	Fields     []*Field  `json:"fields"`
 	PartitionN int       `json:"partitionN"`
+
+	Description string `json:"description,omitempty"`
+	CreatedAt   int64  `json:"createdAt,omitempty"`
 }
 
 // CreateID generates a unique identifier for Table. If Table has already been
@@ -518,6 +521,8 @@ type Field struct {
 	Name    FieldName    `json:"name"`
 	Type    BaseType     `json:"type"`
 	Options FieldOptions `json:"options"`
+
+	CreatedAt int64 `json:"createdAt,omitempty"`
 }
 
 // String returns the field name as a string.

schema.go

@@ -72,6 +72,7 @@ func (s *onPremSchema) CreateTable(ctx context.Context, tbl *dax.Table) error {
 		Keys:           keyed,
 		TrackExistence: true,
 		PartitionN:     tbl.PartitionN,
+		Description:    tbl.Description,
 	}
 
 	// Add the index.
@@ -135,6 +136,9 @@ func IndexInfoToTable(ii *IndexInfo) *dax.Table {
 		Name:       dax.TableName(ii.Name),
 		Fields:     make([]*dax.Field, 0, len(ii.Fields)+1), // +1 to account for the _id field
 		PartitionN: dax.DefaultPartitionN,
+
+		Description: ii.Options.Description,
+		CreatedAt:   ii.CreatedAt,
 	}
 
 	// // sortedFields will contain the sorted list of fields from IndexInfo.
@@ -154,8 +158,9 @@ func IndexInfoToTable(ii *IndexInfo) *dax.Table {
 		idType = dax.BaseTypeString
 	}
 	tbl.Fields = append(tbl.Fields, &dax.Field{
-		Name: "_id",
-		Type: idType,
+		Name:      "_id",
+		Type:      idType,
+		CreatedAt: ii.CreatedAt,
 	})
 
 	// Populate the rest of the fields.
@@ -243,6 +248,8 @@ func FieldInfoToField(fi *FieldInfo) *dax.Field {
 			TTL:            fo.TTL,
 			ForeignIndex:   foreignIndex,
 		},
+
+		CreatedAt: fi.CreatedAt,
 	}
 }
 
@@ -271,10 +278,11 @@ func TablesToIndexInfos(tbls []*dax.Table) []*IndexInfo {
 func TableToIndexInfo(tbl *dax.Table) *IndexInfo {
 	ii := &IndexInfo{
 		Name:      string(tbl.Name), // TODO(tlt): this should be TableKey i think
-		CreatedAt: 0,
+		CreatedAt: tbl.CreatedAt,
 		Options: IndexOptions{
 			Keys:           tbl.StringKeys(),
 			TrackExistence: true,
+			Description:    tbl.Description,
 		},
 		ShardWidth: ShardWidth,
 	}
@@ -320,7 +328,7 @@ func FieldToFieldInfo(fld *dax.Field) *FieldInfo {
 
 	return &FieldInfo{
 		Name:      string(fld.Name),
-		CreatedAt: 0, // TODO(tlt): we need to handle this on MDS schemar
+		CreatedAt: fld.CreatedAt,
 		Options: FieldOptions{
 			Type:           fieldToFieldType(fld),
 			Base:           base,

sql3/planner/opcreatetable.go

@@ -128,10 +128,10 @@ func (i *createTableRowIter) Next(ctx context.Context) (types.Row, error) {
 		// TODO(tlt): once we can support different partitionN's per table,
 		// replace dax.DefaultPartitionN with i.keyPartitions.
 		PartitionN: dax.DefaultPartitionN,
-		// TODO(tlt): add Description to dax.Table; = i.description
+
+		Description: i.description,
 	}
 
-	// TODO (pok) add ability to add description here
 	if err := i.planner.schemaAPI.CreateTable(ctx, tbl); err != nil {
 		if _, ok := errors.Cause(err).(pilosa.ConflictError); ok {
 			if i.failIfExists {

sql3/planner/opfeaturebasecolumns.go

@@ -154,8 +154,7 @@ func (i *showColumnsRowIter) Next(ctx context.Context) (types.Row, error) {
 	if i.rowIndex < len(i.tbl.Fields) {
 		fields := i.tbl.Fields
 
-		//tm := time.Unix(0, fields[i.rowIndex].CreatedAt)
-		tm := time.Unix(0, 0)
+		tm := time.Unix(0, fields[i.rowIndex].CreatedAt)
 
 		row := []interface{}{
 			fields[i.rowIndex].Name,