applycache

Documentation

Index

• type ApplyCache
  • func NewApplyCache(ctx sessionctx.Context) (*ApplyCache, error)
  • func (c *ApplyCache) Get(key applyCacheKey) (*chunk.List, error)
  • func (c *ApplyCache) GetMemTracker() *memory.Tracker
  • func (c *ApplyCache) Set(key applyCacheKey, value *chunk.List) (bool, error)

Types

type ApplyCache

type ApplyCache struct {
	// contains filtered or unexported fields
}

ApplyCache is used in the apply executor. When we get the same value of the outer row. We fetch the inner rows in the cache not to fetch them in the inner executor.

func NewApplyCache

func NewApplyCache(ctx sessionctx.Context) (*ApplyCache, error)

NewApplyCache creates a new ApplyCache.

func (*ApplyCache) Get

func (c *ApplyCache) Get(key applyCacheKey) (*chunk.List, error)

Get gets a cache item according to cache key. It's thread-safe.

func (*ApplyCache) GetMemTracker

func (c *ApplyCache) GetMemTracker() *memory.Tracker

GetMemTracker returns the memory tracker of this apply cache.

func (*ApplyCache) Set

func (c *ApplyCache) Set(key applyCacheKey, value *chunk.List) (bool, error)

Set inserts an item to the cache. It's thread-safe.