util

type AccessPath struct {
	Index          *model.IndexInfo
	FullIdxCols    []*expression.Column
	FullIdxColLens []int
	IdxCols        []*expression.Column
	IdxColLens     []int
	Ranges         []*ranger.Range
	// CountAfterAccess is the row count after we apply range seek and before we use other filter to filter data.
	// For index merge path, CountAfterAccess is the row count after partial paths and before we apply table filters.
	CountAfterAccess float64
	// CountAfterIndex is the row count after we apply filters on index and before we apply the table filters.
	CountAfterIndex float64
	AccessConds     []expression.Expression
	EqCondCount     int
	EqOrInCondCount int
	IndexFilters    []expression.Expression
	TableFilters    []expression.Expression
	// PartialIndexPaths store all index access paths.
	// If there are extra filters, store them in TableFilters.
	PartialIndexPaths []*AccessPath

	IsDNFCond bool

	// IsTiFlashGlobalRead indicates whether this path is a remote read path for tiflash
	IsTiFlashGlobalRead bool

	// IsIntHandlePath indicates whether this path is table path.
	IsIntHandlePath    bool
	IsCommonHandlePath bool
	// Forced means this path is generated by `use/force index()`.
	Forced bool
}

type ByItems struct {
	Expr expression.Expression
	Desc bool
}