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feat(sql): add Snowflake support (#2707)
* feat: add Snowflake support * test: change comment to match db being tested * refactor: move static mapping out of function
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,202 @@ | ||
| package sql | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| "strconv" | ||
| "time" | ||
|
|
||
| "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" | ||
| ) | ||
|
|
||
| // Snowflake DB support. | ||
| // Notes: | ||
| // * type mapping | ||
| // - see https://pkg.go.dev/github.com/snowflakedb/gosnowflake | ||
| // - current mappings are valid for v1.3.4 | ||
|
|
||
| type SnowflakeRowReader struct { | ||
| Cursor *sql.Rows | ||
| columns []interface{} | ||
| columnTypes []flux.ColType | ||
| columnNames []string | ||
| sqlTypes []*sql.ColumnType | ||
| NextFunc func() bool | ||
| CloseFunc func() error | ||
| } | ||
|
|
||
| const ( | ||
| layoutDate = "2006-01-02" | ||
| layoutTime = "15:04:05" | ||
| layoutTimeStampNtz = "2006-01-02T15:04:05.0000000000" | ||
| ) | ||
|
|
||
| // Next prepares SnowflakeRowReader to return rows | ||
| func (m *SnowflakeRowReader) 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 *SnowflakeRowReader) 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: // never happens with scan into []*interface{} | ||
| row[i] = values.New(value) | ||
| case string: | ||
| switch m.columnTypes[i] { | ||
| case flux.TFloat: | ||
| f, err := strconv.ParseFloat(value, 64) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| row[i] = values.NewFloat(f) | ||
| case flux.TInt: | ||
| d, err := strconv.ParseInt(value, 10, 64) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| row[i] = values.NewInt(d) | ||
| case flux.TBool: | ||
| b, err := strconv.ParseBool(value) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| row[i] = values.NewBool(b) | ||
| default: | ||
| row[i] = values.New(value) | ||
| } | ||
| case time.Time: | ||
| // DATE, TIME and TIMESTAMP_NTZ types get scanned to time.Time by the driver, | ||
| // but they have no counterpart in Flux therefore will be represented as string | ||
| switch m.sqlTypes[i].DatabaseTypeName() { | ||
| case "DATE": | ||
| row[i] = values.NewString(value.Format(layoutDate)) | ||
| case "TIME": | ||
| row[i] = values.NewString(value.Format(layoutTime)) | ||
| case "TIMESTAMP_NTZ": | ||
| row[i] = values.NewString(value.Format(layoutTimeStampNtz)) | ||
| default: | ||
| row[i] = values.NewTime(values.ConvertTime(value)) | ||
| } | ||
| case nil: | ||
| row[i] = values.NewNull(flux.SemanticType(m.columnTypes[i])) | ||
| default: | ||
| execute.PanicUnknownType(flux.TInvalid) | ||
| } | ||
| } | ||
| return row, nil | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) InitColumnNames(names []string) { | ||
| m.columnNames = names | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) InitColumnTypes(types []*sql.ColumnType) { | ||
| fluxTypes := make([]flux.ColType, len(types)) | ||
| for i := 0; i < len(types); i++ { | ||
| switch types[i].DatabaseTypeName() { | ||
| case "FIXED", "NUMBER": // FIXED is reported by Snowflake driver | ||
| _, scale, ok := types[i].DecimalSize() | ||
| if ok && scale > 0 { | ||
| fluxTypes[i] = flux.TFloat | ||
| } else { | ||
| fluxTypes[i] = flux.TInt | ||
| } | ||
| case "REAL", "FLOAT": // REAL is reported by Snowflake driver | ||
| fluxTypes[i] = flux.TFloat | ||
| case "BOOLEAN": | ||
| fluxTypes[i] = flux.TBool | ||
| case "TIMESTAMP_TZ", "TIMESTAMP_LTZ": // "TIMESTAMP_NTZ", "DATE" and "TIME" will be represented as string | ||
| fluxTypes[i] = flux.TTime | ||
| default: | ||
| fluxTypes[i] = flux.TString | ||
| } | ||
| } | ||
| m.columnTypes = fluxTypes | ||
| m.sqlTypes = types | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) ColumnNames() []string { | ||
| return m.columnNames | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) ColumnTypes() []flux.ColType { | ||
| return m.columnTypes | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) SetColumnTypes(types []flux.ColType) { | ||
| m.columnTypes = types | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) SetColumns(i []interface{}) { | ||
| m.columns = i | ||
| } | ||
|
|
||
| func (m *SnowflakeRowReader) Close() error { | ||
| if m.CloseFunc != nil { | ||
| return m.CloseFunc() | ||
| } | ||
| if err := m.Cursor.Err(); err != nil { | ||
| return err | ||
| } | ||
| return m.Cursor.Close() | ||
| } | ||
|
|
||
| func NewSnowflakeRowReader(r *sql.Rows) (execute.RowReader, error) { | ||
| reader := &SnowflakeRowReader{ | ||
| 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 fluxToSnowflake = map[flux.ColType]string{ | ||
| flux.TFloat: "FLOAT", | ||
| flux.TInt: "NUMBER", | ||
| flux.TString: "TEXT", | ||
| flux.TBool: "BOOLEAN", | ||
| flux.TTime: "TIMESTAMP_LTZ", | ||
| } | ||
|
|
||
| // SnowflakeTranslateColumn translates flux colTypes into their corresponding Snowflake column type | ||
| func SnowflakeColumnTranslateFunc() translationFunc { | ||
| return func(f flux.ColType, colName string) (string, error) { | ||
| s, found := fluxToSnowflake[f] | ||
| if !found { | ||
| return "", errors.Newf(codes.Internal, "Snowflake does not support column type %s", f.String()) | ||
| } | ||
| return colName + " " + s, nil | ||
| } | ||
| } |
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