/
table_head.go
194 lines (167 loc) · 4.79 KB
/
table_head.go
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package queries
import (
"context"
"fmt"
"io"
"strings"
runtimev1 "github.com/rilldata/rill/proto/gen/rill/runtime/v1"
"github.com/rilldata/rill/runtime"
"github.com/rilldata/rill/runtime/drivers"
"google.golang.org/protobuf/types/known/structpb"
)
type TableHead struct {
Connector string
Database string
DatabaseSchema string
TableName string
Limit int
Result []*structpb.Struct
Schema *runtimev1.StructType
}
var _ runtime.Query = &TableHead{}
func (q *TableHead) Key() string {
return fmt.Sprintf("TableHead:%s:%d", q.TableName, q.Limit)
}
func (q *TableHead) Deps() []*runtimev1.ResourceName {
return []*runtimev1.ResourceName{
{Kind: runtime.ResourceKindSource, Name: q.TableName},
{Kind: runtime.ResourceKindModel, Name: q.TableName},
}
}
func (q *TableHead) MarshalResult() *runtime.QueryResult {
var size int64
if len(q.Result) > 0 {
// approx
size = sizeProtoMessage(q.Result[0]) * int64(len(q.Result))
}
return &runtime.QueryResult{
Value: q.Result,
Bytes: size,
}
}
func (q *TableHead) UnmarshalResult(v any) error {
res, ok := v.([]*structpb.Struct)
if !ok {
return fmt.Errorf("TableHead: mismatched unmarshal input")
}
q.Result = res
return nil
}
func (q *TableHead) Resolve(ctx context.Context, rt *runtime.Runtime, instanceID string, priority int) error {
olap, release, err := rt.OLAP(ctx, instanceID, q.Connector)
if err != nil {
return err
}
defer release()
if olap.Dialect() != drivers.DialectDuckDB && olap.Dialect() != drivers.DialectClickHouse && olap.Dialect() != drivers.DialectDruid {
return fmt.Errorf("not available for dialect '%s'", olap.Dialect())
}
query, err := q.buildTableHeadSQL(ctx, olap)
if err != nil {
return err
}
rows, err := olap.Execute(ctx, &drivers.Statement{
Query: query,
Priority: priority,
ExecutionTimeout: defaultExecutionTimeout,
})
if err != nil {
return err
}
defer rows.Close()
data, err := rowsToData(rows)
if err != nil {
return err
}
q.Result = data
q.Schema = rows.Schema
return nil
}
func (q *TableHead) Export(ctx context.Context, rt *runtime.Runtime, instanceID string, w io.Writer, opts *runtime.ExportOptions) error {
olap, release, err := rt.OLAP(ctx, instanceID, q.Connector)
if err != nil {
return err
}
defer release()
switch olap.Dialect() {
case drivers.DialectDuckDB:
if opts.Format == runtimev1.ExportFormat_EXPORT_FORMAT_CSV || opts.Format == runtimev1.ExportFormat_EXPORT_FORMAT_PARQUET {
filename := q.TableName
sql, err := q.buildTableHeadSQL(ctx, olap)
if err != nil {
return err
}
args := []interface{}{}
if err := DuckDBCopyExport(ctx, w, opts, sql, args, filename, olap, opts.Format); err != nil {
return err
}
} else {
if err := q.generalExport(ctx, rt, instanceID, w, opts); err != nil {
return err
}
}
case drivers.DialectDruid:
if err := q.generalExport(ctx, rt, instanceID, w, opts); err != nil {
return err
}
case drivers.DialectClickHouse:
if err := q.generalExport(ctx, rt, instanceID, w, opts); err != nil {
return err
}
default:
return fmt.Errorf("not available for dialect '%s'", olap.Dialect())
}
return nil
}
func (q *TableHead) generalExport(ctx context.Context, rt *runtime.Runtime, instanceID string, w io.Writer, opts *runtime.ExportOptions) error {
err := q.Resolve(ctx, rt, instanceID, opts.Priority)
if err != nil {
return err
}
if opts.PreWriteHook != nil {
err = opts.PreWriteHook(q.TableName)
if err != nil {
return err
}
}
meta := structTypeToMetricsViewColumn(q.Schema)
switch opts.Format {
case runtimev1.ExportFormat_EXPORT_FORMAT_UNSPECIFIED:
return fmt.Errorf("unspecified format")
case runtimev1.ExportFormat_EXPORT_FORMAT_CSV:
return WriteCSV(meta, q.Result, w)
case runtimev1.ExportFormat_EXPORT_FORMAT_XLSX:
return WriteXLSX(meta, q.Result, w)
case runtimev1.ExportFormat_EXPORT_FORMAT_PARQUET:
return WriteParquet(meta, q.Result, w)
}
return nil
}
func (q *TableHead) buildTableHeadSQL(ctx context.Context, olap drivers.OLAPStore) (string, error) {
columns, err := supportedColumns(ctx, olap, q.Database, q.DatabaseSchema, q.TableName)
if err != nil {
return "", err
}
limitClause := ""
if q.Limit > 0 {
limitClause = fmt.Sprintf(" LIMIT %d", q.Limit)
}
sql := fmt.Sprintf(
`SELECT %s FROM %s%s`,
strings.Join(columns, ","),
olap.Dialect().EscapeTable(q.Database, q.DatabaseSchema, q.TableName),
limitClause,
)
return sql, nil
}
func supportedColumns(ctx context.Context, olap drivers.OLAPStore, db, schema, tblName string) ([]string, error) {
tbl, err := olap.InformationSchema().Lookup(ctx, db, schema, tblName)
if err != nil {
return nil, err
}
var columns []string
for _, field := range tbl.Schema.Fields {
columns = append(columns, safeName(field.Name))
}
return columns, nil
}