feat(bigquery): support for tables primary and foreign keys

bigquery/table.go

@@ -147,6 +147,106 @@ type TableMetadata struct {
 	//   - '': empty string. Default to case-sensitive behavior.
 	// More information: https://cloud.google.com/bigquery/docs/reference/standard-sql/collation-concepts
 	DefaultCollation string
+
+	// TableConstraints contains table primary and foreign keys constraints.
+	// Present only if the table has primary or foreign keys.
+	TableConstraints *TableConstraints
+}
+
+// TableConstraints defines the primary key and foreign key of a table.
+type TableConstraints struct {
+	// PrimaryKey constraint on a table's columns.
+	// Present only if the table has a primary key.
+	// The primary key is not enforced.
+	PrimaryKey *PrimaryKey
+
+	// ForeignKeys represent a list of foreign keys constraints.
+	// Foreign keys are not enforced.
+	ForeignKeys []*ForeignKey
+}
+
+// PrimaryKey represents the primary key constraint on a table's columns.
+type PrimaryKey struct {
+	// Columns that compose the primary key constraint.
+	Columns []string
+}
+
+func (pk *PrimaryKey) toBQ() *bq.TableConstraintsPrimaryKey {
+	return &bq.TableConstraintsPrimaryKey{
+		Columns: pk.Columns,
+	}
+}
+
+func bqToPrimaryKey(tc *bq.TableConstraints) *PrimaryKey {
+	if tc.PrimaryKey == nil {
+		return nil
+	}
+	return &PrimaryKey{
+		Columns: tc.PrimaryKey.Columns,
+	}
+}
+
+// ForeignKey represents a foreign key constraint on a table's columns.
+type ForeignKey struct {
+	// Foreign key constraint name.
+	Name string
+
+	// Table that holds the primary key and is referenced by this foreign key.
+	ReferencedTable *Table
+
+	// Columns that compose the foreign key.
+	ColumnReferences []*ColumnReference
+}
+
+func (fk *ForeignKey) toBQ() *bq.TableConstraintsForeignKeys {
+	colRefs := []*bq.TableConstraintsForeignKeysColumnReferences{}
+	for _, colRef := range fk.ColumnReferences {
+		colRefs = append(colRefs, colRef.toBQ())
+	}
+	return &bq.TableConstraintsForeignKeys{
+		Name: fk.Name,
+		ReferencedTable: &bq.TableConstraintsForeignKeysReferencedTable{
+			DatasetId: fk.ReferencedTable.DatasetID,
+			ProjectId: fk.ReferencedTable.ProjectID,
+			TableId:   fk.ReferencedTable.TableID,
+		},
+		ColumnReferences: colRefs,
+	}
+}
+
+func bqToForeignKeys(tc *bq.TableConstraints, c *Client) []*ForeignKey {
+	fks := []*ForeignKey{}
+	for _, fk := range tc.ForeignKeys {
+		colRefs := []*ColumnReference{}
+		for _, colRef := range fk.ColumnReferences {
+			colRefs = append(colRefs, &ColumnReference{
+				ReferencedColumn:  colRef.ReferencedColumn,
+				ReferencingColumn: colRef.ReferencingColumn,
+			})
+		}
+		fks = append(fks, &ForeignKey{
+			Name:             fk.Name,
+			ReferencedTable:  c.DatasetInProject(fk.ReferencedTable.DatasetId, fk.ReferencedTable.ProjectId).Table(fk.ReferencedTable.TableId),
+			ColumnReferences: colRefs,
+		})
+	}
+	return fks
+}
+
+// ColumnReference represents the pair of the foreign key column and primary key column.
+type ColumnReference struct {
+	// ReferencingColumn is the column in the current table that composes the foreign key.
+	ReferencingColumn string
+	// ReferencedColumn is the column in the primary key of the foreign table that
+	// is referenced by the ReferencingColumn.
+	ReferencedColumn string
+}
+
+func (colRef *ColumnReference) toBQ() *bq.TableConstraintsForeignKeysColumnReferences {
+	return &bq.TableConstraintsForeignKeysColumnReferences{
+		ReferencedColumn:  colRef.ReferencedColumn,
+		ReferencingColumn: colRef.ReferencingColumn,
+	}
 }
 
 // TableCreateDisposition specifies the circumstances under which destination table will be created.
@@ -675,6 +775,19 @@ func (tm *TableMetadata) toBQ() (*bq.Table, error) {
 		return nil, errors.New("cannot set ETag on create")
 	}
 	t.DefaultCollation = string(tm.DefaultCollation)
+
+	if tm.TableConstraints != nil {
+		t.TableConstraints = &bq.TableConstraints{}
+		if tm.TableConstraints.PrimaryKey != nil {
+			t.TableConstraints.PrimaryKey = tm.TableConstraints.PrimaryKey.toBQ()
+		}
+		if len(tm.TableConstraints.ForeignKeys) > 0 {
+			t.TableConstraints.ForeignKeys = make([]*bq.TableConstraintsForeignKeys, len(tm.TableConstraints.ForeignKeys))
+			for i, fk := range tm.TableConstraints.ForeignKeys {
+				t.TableConstraints.ForeignKeys[i] = fk.toBQ()
+			}
+		}
+	}
 	return t, nil
 }
 
@@ -788,6 +901,12 @@ func bqToTableMetadata(t *bq.Table, c *Client) (*TableMetadata, error) {
 		}
 		md.ExternalDataConfig = edc
 	}
+	if t.TableConstraints != nil {
+		md.TableConstraints = &TableConstraints{
+			PrimaryKey:  bqToPrimaryKey(t.TableConstraints),
+			ForeignKeys: bqToForeignKeys(t.TableConstraints, c),
+		}
+	}
 	return md, nil
 }
 
@@ -947,6 +1066,21 @@ func (tm *TableMetadataToUpdate) toBQ() (*bq.Table, error) {
 		t.DefaultCollation = optional.ToString(tm.DefaultCollation)
 		forceSend("DefaultCollation")
 	}
+	if tm.TableConstraints != nil {
+		t.TableConstraints = &bq.TableConstraints{}
+		if tm.TableConstraints.PrimaryKey != nil {
+			t.TableConstraints.PrimaryKey = tm.TableConstraints.PrimaryKey.toBQ()
+			t.TableConstraints.PrimaryKey.ForceSendFields = append(t.TableConstraints.PrimaryKey.ForceSendFields, "Columns")
+			t.TableConstraints.ForceSendFields = append(t.TableConstraints.ForceSendFields, "PrimaryKey")
+		}
+		if tm.TableConstraints.ForeignKeys != nil {
+			t.TableConstraints.ForeignKeys = make([]*bq.TableConstraintsForeignKeys, len(tm.TableConstraints.ForeignKeys))
+			for i, fk := range tm.TableConstraints.ForeignKeys {
+				t.TableConstraints.ForeignKeys[i] = fk.toBQ()
+			}
+			t.TableConstraints.ForceSendFields = append(t.TableConstraints.ForceSendFields, "ForeignKeys")
+		}
+	}
 	labels, forces, nulls := tm.update()
 	t.Labels = labels
 	t.ForceSendFields = append(t.ForceSendFields, forces...)
@@ -1024,6 +1158,10 @@ type TableMetadataToUpdate struct {
 	// in the table.
 	DefaultCollation optional.String
 
+	// TableConstraints allows modification of table constraints
+	// such as primary and foreign keys.
+	TableConstraints *TableConstraints
+
 	labelUpdater
 }
 

bigquery/table_integration_test.go

@@ -661,3 +661,189 @@ func TestIntegration_TableDefaultCollation(t *testing.T) {
 		}
 	}
 }
+
+func TestIntegration_TableConstraintsPK(t *testing.T) {
+	// Test Primary Keys for Table.Create and Table.Update
+	if client == nil {
+		t.Skip("Integration tests skipped")
+	}
+	ctx := context.Background()
+	table := dataset.Table(tableIDs.New())
+	err := table.Create(context.Background(), &TableMetadata{
+		Schema: schema,
+		TableConstraints: &TableConstraints{
+			PrimaryKey: &PrimaryKey{
+				Columns: []string{"name"},
+			},
+		},
+		ExpirationTime: testTableExpiration,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer table.Delete(ctx)
+	md, err := table.Metadata(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if md.TableConstraints.PrimaryKey.Columns[0] != "name" {
+		t.Fatalf("expected table primary key to contain column `name`, but found %q", md.TableConstraints.PrimaryKey.Columns)
+	}
+
+	md, err = table.Update(ctx, TableMetadataToUpdate{
+		TableConstraints: &TableConstraints{
+			PrimaryKey: &PrimaryKey{}, // clean primary keys
+		},
+	}, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if md.TableConstraints != nil {
+		t.Fatalf("expected table primary keys to be removed, but found %v", md.TableConstraints.PrimaryKey)
+	}
+
+	tableNoPK := dataset.Table(tableIDs.New())
+	err = tableNoPK.Create(context.Background(), &TableMetadata{
+		Schema:         schema,
+		ExpirationTime: testTableExpiration,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tableNoPK.Delete(ctx)
+	md, err = tableNoPK.Metadata(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if md.TableConstraints != nil {
+		t.Fatalf("expected table to not have a PK, but found %v", md.TableConstraints.PrimaryKey.Columns)
+	}
+
+	md, err = tableNoPK.Update(ctx, TableMetadataToUpdate{
+		TableConstraints: &TableConstraints{
+			PrimaryKey: &PrimaryKey{
+				Columns: []string{"name"},
+			},
+		},
+	}, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if md.TableConstraints.PrimaryKey == nil || md.TableConstraints.PrimaryKey.Columns[0] != "name" {
+		t.Fatalf("expected table primary key to contain column `name`, but found %v", md.TableConstraints.PrimaryKey)
+	}
+}
+
+func TestIntegration_TableConstraintsFK(t *testing.T) {
+	// Test Foreign keys for Table.Create and Table.Update
+	if client == nil {
+		t.Skip("Integration tests skipped")
+	}
+	ctx := context.Background()
+	tableA := dataset.Table(tableIDs.New())
+	schemaA := []*FieldSchema{
+		{Name: "id", Type: IntegerFieldType},
+		{Name: "name", Type: StringFieldType},
+	}
+	err := tableA.Create(context.Background(), &TableMetadata{
+		Schema: schemaA,
+		TableConstraints: &TableConstraints{
+			PrimaryKey: &PrimaryKey{
+				Columns: []string{"id"},
+			},
+		},
+		ExpirationTime: testTableExpiration,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tableA.Delete(ctx)
+
+	tableB := dataset.Table(tableIDs.New())
+	schemaB := []*FieldSchema{
+		{Name: "id", Type: IntegerFieldType},
+		{Name: "name", Type: StringFieldType},
+		{Name: "parent", Type: IntegerFieldType},
+	}
+	err = tableB.Create(context.Background(), &TableMetadata{
+		Schema: schemaB,
+		TableConstraints: &TableConstraints{
+			PrimaryKey: &PrimaryKey{
+				Columns: []string{"id"},
+			},
+			ForeignKeys: []*ForeignKey{
+				{
+					Name:            "table_a_fk",
+					ReferencedTable: tableA,
+					ColumnReferences: []*ColumnReference{
+						{
+							ReferencingColumn: "parent",
+							ReferencedColumn:  "id",
+						},
+					},
+				},
+			},
+		},
+		ExpirationTime: testTableExpiration,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tableB.Delete(ctx)
+	md, err := tableB.Metadata(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(md.TableConstraints.ForeignKeys) >= 0 && md.TableConstraints.ForeignKeys[0].Name != "table_a_fk" {
+		t.Fatalf("expected table to contains fk `table_a_fk`, but found %v", md.TableConstraints.ForeignKeys)
+	}
+
+	md, err = tableB.Update(ctx, TableMetadataToUpdate{
+		TableConstraints: &TableConstraints{
+			ForeignKeys: []*ForeignKey{}, // clean foreign keys
+		},
+	}, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(md.TableConstraints.ForeignKeys) > 0 {
+		t.Fatalf("expected table foreign keys to be removed, but found %v", md.TableConstraints.ForeignKeys)
+	}
+
+	tableNoFK := dataset.Table(tableIDs.New())
+	err = tableNoFK.Create(context.Background(), &TableMetadata{
+		Schema: schemaB,
+		TableConstraints: &TableConstraints{
+			PrimaryKey: &PrimaryKey{
+				Columns: []string{"id"},
+			},
+		},
+		ExpirationTime: testTableExpiration,
+	})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer tableNoFK.Delete(ctx)
+	md, err = tableNoFK.Update(ctx, TableMetadataToUpdate{
+		TableConstraints: &TableConstraints{
+			ForeignKeys: []*ForeignKey{
+				{
+					Name:            "table_a_fk",
+					ReferencedTable: tableA,
+					ColumnReferences: []*ColumnReference{
+						{
+							ReferencedColumn:  "id",
+							ReferencingColumn: "parent",
+						},
+					},
+				},
+			},
+		},
+	}, "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(md.TableConstraints.ForeignKeys) == 0 || md.TableConstraints.ForeignKeys[0].Name != "table_a_fk" {
+		t.Fatalf("expected table to contains fk `table_a_fk`, but found %v", md.TableConstraints.ForeignKeys)
+	}
+}