decodeToArrow decodes Postgres text format data and appends directly to Arrow builder
(typeMap *pgtype.Map, columnType *pglogrepl.RelationMessageColumn, data []byte, format int16, builder array.Builder)
| 28 | |
| 29 | // decodeToArrow decodes Postgres text format data and appends directly to Arrow builder |
| 30 | func decodeToArrow(typeMap *pgtype.Map, columnType *pglogrepl.RelationMessageColumn, data []byte, format int16, builder array.Builder) (int, error) { |
| 31 | if data == nil { |
| 32 | builder.AppendNull() |
| 33 | return 0, nil |
| 34 | } |
| 35 | |
| 36 | dt, ok := typeMap.TypeForOID(columnType.DataType) |
| 37 | if !ok { |
| 38 | // Unknown type, store as string if possible |
| 39 | if b, ok := builder.(*array.StringBuilder); ok && format == pgtype.TextFormatCode { |
| 40 | b.BinaryBuilder.Append(data) |
| 41 | return len(data), nil |
| 42 | } |
| 43 | return 0, fmt.Errorf("column %s: unsupported type conversion for OID %d to %T", columnType.Name, columnType.DataType, builder) |
| 44 | } |
| 45 | |
| 46 | var ( |
| 47 | oid = dt.OID |
| 48 | scale int32 |
| 49 | ) |
| 50 | switch oid { |
| 51 | case pgtype.NumericOID, pgtype.NumericArrayOID: |
| 52 | _, scale, _ = pgtypes.DecodePrecisionScale(int(columnType.TypeModifier)) |
| 53 | } |
| 54 | |
| 55 | if ac, ok := dt.Codec.(*pgtype.ArrayCodec); ok { |
| 56 | if builder, ok := builder.(*array.ListBuilder); ok { |
| 57 | return decodeArrayToArrow(typeMap, ac, data, format, scale, builder) |
| 58 | } |
| 59 | return 0, fmt.Errorf("column %s: unexpected Arrow array builder %T for Postgres array", columnType.Name, builder) |
| 60 | } |
| 61 | |
| 62 | // StringBuilder.Append is just StringBuilder.BinaryBuilder.Append |
| 63 | if b, ok := builder.(*array.StringBuilder); ok { |
| 64 | builder = b.BinaryBuilder |
| 65 | } |
| 66 | |
| 67 | // TODO(fan): add dedicated decoder for missing types |
| 68 | switch oid { |
| 69 | case pgtype.BoolOID: |
| 70 | if b, ok := builder.(*array.BooleanBuilder); ok { |
| 71 | var v bool |
| 72 | var codec pgtype.BoolCodec |
| 73 | if err := codec.PlanScan(typeMap, oid, format, &v).Scan(data, &v); err != nil { |
| 74 | return 0, err |
| 75 | } |
| 76 | b.Append(v) |
| 77 | return 1, nil |
| 78 | } |
| 79 | |
| 80 | case pgtype.QCharOID: |
| 81 | if b, ok := builder.(*array.Uint8Builder); ok { |
| 82 | var v byte |
| 83 | var codec pgtype.QCharCodec |
| 84 | if err := codec.PlanScan(typeMap, oid, format, &v).Scan(data, &v); err != nil { |
| 85 | return 0, err |
| 86 | } |
| 87 | b.Append(v) |
no test coverage detected