util

type PlanCacheMatchOpts struct {
	// paramTypes stores all parameters' FieldType, some different parameters may share same plan
	ParamTypes []*types.FieldType
	// limitOffsetAndCount stores all the offset and key parameters extract from limit statement
	// only used for cache and pick plan with parameters in limit
	LimitOffsetAndCount []uint64
	// HasSubQuery indicate whether this query has sub query
	HasSubQuery bool
	// StatsVersionHash is the hash value of the statistics version
	StatsVersionHash uint64

	// Below are some variables that can affect the plan
	ForeignKeyChecks bool
}