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feat(stdlib/sql): add BigQuery support (#2925)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| package sql | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| "math/big" | ||
| "time" | ||
|
|
||
| "cloud.google.com/go/civil" | ||
| _ "github.com/bonitoo-io/go-sql-bigquery" | ||
| "github.com/influxdata/flux" | ||
| "github.com/influxdata/flux/codes" | ||
| "github.com/influxdata/flux/execute" | ||
| "github.com/influxdata/flux/internal/errors" | ||
| "github.com/influxdata/flux/values" | ||
| ) | ||
|
|
||
| // Google BigQuery support. | ||
| // Notes: | ||
| // * data types | ||
| // https://cloud.google.com/bigquery/docs/reference/standard-sql/data-types | ||
| // * connection string | ||
| // https://github.com/bonitoo-io/go-sql-bigquery#connection-string | ||
|
|
||
| type BigQueryRowReader struct { | ||
| Cursor *sql.Rows | ||
| columns []interface{} | ||
| columnTypes []flux.ColType | ||
| columnNames []string | ||
| sqlTypes []*sql.ColumnType | ||
| NextFunc func() bool | ||
| CloseFunc func() error | ||
| } | ||
|
|
||
| // Next prepares BigQueryRowReader to return rows | ||
| func (m *BigQueryRowReader) Next() bool { | ||
| if m.NextFunc != nil { | ||
| return m.NextFunc() | ||
| } | ||
| next := m.Cursor.Next() | ||
| if next { | ||
| columnNames, err := m.Cursor.Columns() | ||
| if err != nil { | ||
| return false | ||
| } | ||
| m.columns = make([]interface{}, len(columnNames)) | ||
| columnPointers := make([]interface{}, len(columnNames)) | ||
| for i := 0; i < len(columnNames); i++ { | ||
| columnPointers[i] = &m.columns[i] | ||
| } | ||
| if err := m.Cursor.Scan(columnPointers...); err != nil { | ||
| return false | ||
| } | ||
| } | ||
| return next | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) GetNextRow() ([]values.Value, error) { | ||
| row := make([]values.Value, len(m.columns)) | ||
| for i, column := range m.columns { | ||
| switch value := column.(type) { | ||
| case bool, int64, float64, string: | ||
| row[i] = values.New(value) | ||
| case civil.Date: | ||
| row[i] = values.NewString(value.String()) | ||
| case civil.DateTime: | ||
| row[i] = values.NewString(value.String()) | ||
| case civil.Time: | ||
| row[i] = values.NewString(value.String()) | ||
| case time.Time: | ||
| row[i] = values.NewTime(values.ConvertTime(value)) | ||
| case *big.Int: | ||
| row[i] = values.NewInt(value.Int64()) | ||
| case *big.Float: | ||
| f, _ := value.Float64() | ||
| row[i] = values.NewFloat(f) | ||
| case *big.Rat: | ||
| f, _ := value.Float64() | ||
| row[i] = values.NewFloat(f) | ||
| case nil: | ||
| row[i] = values.NewNull(flux.SemanticType(m.columnTypes[i])) | ||
| default: | ||
| execute.PanicUnknownType(flux.TInvalid) | ||
| } | ||
| } | ||
| return row, nil | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) InitColumnNames(names []string) { | ||
| m.columnNames = names | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) InitColumnTypes(types []*sql.ColumnType) { | ||
| fluxTypes := make([]flux.ColType, len(types)) | ||
| for i := 0; i < len(types); i++ { | ||
| switch types[i].DatabaseTypeName() { | ||
| case "INTEGER": | ||
| fluxTypes[i] = flux.TInt | ||
| case "FLOAT", "NUMERIC": | ||
| fluxTypes[i] = flux.TFloat | ||
| case "BOOLEAN": | ||
| fluxTypes[i] = flux.TBool | ||
| case "TIMESTAMP": // "DATE", "TIME" and "DATETIME" will be represented as string because TZ is unknown | ||
| fluxTypes[i] = flux.TTime | ||
| default: | ||
| fluxTypes[i] = flux.TString | ||
| } | ||
| } | ||
| m.columnTypes = fluxTypes | ||
| m.sqlTypes = types | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) ColumnNames() []string { | ||
| return m.columnNames | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) ColumnTypes() []flux.ColType { | ||
| return m.columnTypes | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) SetColumnTypes(types []flux.ColType) { | ||
| m.columnTypes = types | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) SetColumns(i []interface{}) { | ||
| m.columns = i | ||
| } | ||
|
|
||
| func (m *BigQueryRowReader) Close() error { | ||
| if m.CloseFunc != nil { | ||
| return m.CloseFunc() | ||
| } | ||
| if err := m.Cursor.Err(); err != nil { | ||
| return err | ||
| } | ||
| return m.Cursor.Close() | ||
| } | ||
|
|
||
| func NewBigQueryRowReader(r *sql.Rows) (execute.RowReader, error) { | ||
| reader := &BigQueryRowReader{ | ||
| Cursor: r, | ||
| } | ||
| cols, err := r.Columns() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| reader.InitColumnNames(cols) | ||
|
|
||
| types, err := r.ColumnTypes() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| reader.InitColumnTypes(types) | ||
|
|
||
| return reader, nil | ||
| } | ||
|
|
||
| var fluxToBigQuery = map[flux.ColType]string{ | ||
| flux.TFloat: "FLOAT64", | ||
| flux.TInt: "INT64", | ||
| flux.TString: "STRING", | ||
| flux.TBool: "BOOL", | ||
| flux.TTime: "TIMESTAMP", | ||
| } | ||
|
|
||
| // BigQueryTranslateColumn translates flux colTypes into their corresponding BigQuery column type | ||
| func BigQueryColumnTranslateFunc() translationFunc { | ||
| return func(f flux.ColType, colName string) (string, error) { | ||
| s, found := fluxToBigQuery[f] | ||
| if !found { | ||
| return "", errors.Newf(codes.Internal, "BigQuery does not support column type %s", f.String()) | ||
| } | ||
| return colName + " " + s, nil | ||
| } | ||
| } |
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