DecodeTSVector decodes a tsvector in disk-storage representation from the input byte slice.
(b []byte)
| 51 | // DecodeTSVector decodes a tsvector in disk-storage representation from the |
| 52 | // input byte slice. |
| 53 | func DecodeTSVector(b []byte) (ret TSVector, err error) { |
| 54 | var nTerms uint32 |
| 55 | var nPositions, position uint16 |
| 56 | b, nTerms, err = encoding.DecodeUint32Ascending(b) |
| 57 | if err != nil { |
| 58 | return nil, err |
| 59 | } |
| 60 | ret = make([]tsTerm, nTerms) |
| 61 | for i := uint32(0); i < nTerms; i++ { |
| 62 | var lexeme []byte |
| 63 | b, lexeme, err = encoding.DecodeUntaggedBytesValue(b) |
| 64 | if err != nil { |
| 65 | return nil, err |
| 66 | } |
| 67 | b, nPositions, err = encoding.DecodeUint16Ascending(b) |
| 68 | if err != nil { |
| 69 | return nil, err |
| 70 | } |
| 71 | term := &ret[i] |
| 72 | term.lexeme = string(lexeme) |
| 73 | term.positions = make([]tsPosition, nPositions) |
| 74 | for j := uint16(0); j < nPositions; j++ { |
| 75 | b, position, err = encoding.DecodeUint16Ascending(b) |
| 76 | if err != nil { |
| 77 | return nil, err |
| 78 | } |
| 79 | encodedWeight := position >> 14 |
| 80 | weight, err := tsWeightFromVectorPGEncoding(byte(encodedWeight)) |
| 81 | if err != nil { |
| 82 | return nil, err |
| 83 | } |
| 84 | // Clear the 2 most significant bits (they were used for the weight). |
| 85 | position = position & (^(uint16(3) << 14)) |
| 86 | term.positions[j] = tsPosition{position: position, weight: weight} |
| 87 | } |
| 88 | } |
| 89 | return ret, nil |
| 90 | } |
| 91 | |
| 92 | // EncodeTSVectorPGBinary encodes a tsvector into a serialized representation |
| 93 | // that's identical to Postgres's wire protocol representation. |
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