Function NewScanQueryGenerator

pkg/ttl/sqlbuilder/sql.go:319–336

NewScanQueryGenerator creates a new ScanQueryGenerator

(tbl *cache.PhysicalTable, expire time.Time,
	rangeStart, rangeEnd []types.Datum)

// NewScanQueryGenerator creates a new ScanQueryGenerator
func NewScanQueryGenerator(tbl *cache.PhysicalTable, expire time.Time,
	rangeStart, rangeEnd []types.Datum) (*ScanQueryGenerator, error) {
	if err := tbl.ValidateKeyPrefix(rangeStart); err != nil {
		return nil, err
	}

	if err := tbl.ValidateKeyPrefix(rangeEnd); err != nil {
		return nil, err
	}

	return &ScanQueryGenerator{
		tbl:           tbl,
		expire:        expire,
		keyRangeStart: rangeStart,
		keyRangeEnd:   rangeEnd,
		firstBuild:    true,
	}, nil
}

// NextSQL creates next sql of the scan task
func (g *ScanQueryGenerator) NextSQL(continueFromResult [][]types.Datum, nextLimit int) (string, error) {