/
join.go
131 lines (118 loc) · 3.53 KB
/
join.go
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package bigquery
import (
"context"
"fmt"
"strings"
"cloud.google.com/go/bigquery"
"google.golang.org/api/iterator"
"github.com/oom-ai/oomstore/internal/database/dbutil"
"github.com/oom-ai/oomstore/internal/database/offline"
"github.com/oom-ai/oomstore/internal/database/offline/sqlutil"
"github.com/oom-ai/oomstore/pkg/errdefs"
"github.com/oom-ai/oomstore/pkg/oomstore/types"
)
func (db *DB) Join(ctx context.Context, opt offline.JoinOpt) (*types.JoinResult, error) {
dbOpt := dbutil.DBOpt{
Backend: Backend,
BigQueryDB: db.Client,
DatasetID: &db.datasetID,
}
doJoinOpt := sqlutil.DoJoinOpt{
JoinOpt: opt,
QueryResults: bigqueryQueryResults,
QueryTableTimeRange: bigqueryQueryTimeRange,
ReadJoinResultQuery: READ_JOIN_RESULT_QUERY,
}
return sqlutil.DoJoin(ctx, dbOpt, doJoinOpt)
}
func bigqueryQueryTimeRange(ctx context.Context, dbOpt dbutil.DBOpt, tableName string) (*types.DataTableTimeRange, error) {
return getTableTimeRange(ctx, dbOpt, tableName)
}
func bigqueryQueryResults(ctx context.Context, dbOpt dbutil.DBOpt, query string, header dbutil.ColumnList, dropTableNames []string, backendType types.BackendType) (*types.JoinResult, error) {
rows, err := dbOpt.BigQueryDB.Query(query).Read(ctx)
if err != nil {
return nil, errdefs.WithStack(err)
}
data := make(chan types.JoinRecord)
go func() {
defer func() {
if err = dropTemporaryTables(ctx, dbOpt.BigQueryDB, dropTableNames); err != nil {
select {
case data <- types.JoinRecord{Error: err}:
// nothing to do
default:
}
}
close(data)
}()
for {
recordMap := make(map[string]bigquery.Value)
err = rows.Next(&recordMap)
if err == iterator.Done {
return
}
if err != nil {
select {
case data <- types.JoinRecord{Error: errdefs.WithStack(err)}:
// nothing to do
case <-ctx.Done():
return
}
continue
}
record := make([]interface{}, 0, len(recordMap))
for i := range header {
column := strings.Split(header[i].Name, ".")
deserializedValue, err := dbutil.DeserializeByValueType(recordMap[column[len(column)-1]], header[i].ValueType, backendType)
if err != nil {
select {
case data <- types.JoinRecord{Error: err}:
// nothing to do
case <-ctx.Done():
return
}
continue
}
record = append(record, deserializedValue)
}
select {
case data <- types.JoinRecord{Record: record, Error: nil}:
// nothing to do
case <-ctx.Done():
return
}
}
}()
return &types.JoinResult{
Header: header.Names(),
Data: data,
}, nil
}
func dropTemporaryTables(ctx context.Context, db *bigquery.Client, tableNames []string) error {
var err error
for _, tableName := range tableNames {
if tmpErr := dropTable(ctx, db, tableName); tmpErr != nil {
err = tmpErr
}
}
return err
}
func dropTable(ctx context.Context, db *bigquery.Client, tableName string) error {
query := fmt.Sprintf(`DROP TABLE IF EXISTS %s;`, tableName)
if _, err := db.Query(query).Read(ctx); err != nil {
return errdefs.WithStack(err)
}
return nil
}
const READ_JOIN_RESULT_QUERY = `
SELECT
{{ qt .EntityRowsTableName }}.{{ qt .EntityKey }},
{{ qt .EntityRowsTableName }}.{{ qt .UnixMilli }},
{{ fieldJoin .Fields }}
FROM {{ $.DatasetID }}.{{ qt .EntityRowsTableName }}
{{ range $pair := .JoinTables }}
{{- $t1 := qt $pair.LeftTable -}}
{{- $t2 := qt $pair.RightTable -}}
lEFT JOIN {{ $.DatasetID }}.{{ $t2 }}
ON {{ $t1 }}.{{ qt $.UnixMilli }} = {{ $t2 }}.{{ qt $.UnixMilli }} AND {{ $t1 }}.{{ qt $.EntityKey }} = {{ $t2 }}.{{ qt $.EntityKey }}
{{end}}`