// Next implements Executor Next interface.
// The data in the returned row is not used by caller.
func (e *JoinInnerExec) Next() (*Row, error) {
if e.done {
return nil, nil
}
rowKeysSlice := make([][]*RowKeyEntry, len(e.InnerPlans))
for {
exec := e.innerExecs[e.cursor]
if exec == nil {
innerPlan := e.InnerPlans[e.cursor]
plan.Refine(innerPlan)
exec = e.builder.build(innerPlan)
if e.builder.err != nil {
return nil, errors.Trace(e.builder.err)
}
e.innerExecs[e.cursor] = exec
}
row, err := exec.Next()
if err != nil {
return nil, errors.Trace(err)
}
if row == nil {
exec.Close()
e.innerExecs[e.cursor] = nil
if e.cursor == 0 {
e.done = true
return nil, nil
}
e.cursor--
continue
}
rowKeysSlice[e.cursor] = row.RowKeys
if e.cursor < len(e.innerExecs)-1 {
e.cursor++
continue
}
var match = true
if e.Condition != nil {
match, err = evaluator.EvalBool(e.ctx, e.Condition)
if err != nil {
return nil, errors.Trace(err)
}
}
if match {
row.RowKeys = joinRowKeys(rowKeysSlice)
return row, nil
}
}
}
// Next implements Executor Next interface.
func (e *FilterExec) Next() (*Row, error) {
for {
srcRow, err := e.Src.Next()
if err != nil {
return nil, errors.Trace(err)
}
if srcRow == nil {
return nil, nil
}
match, err := evaluator.EvalBool(e.ctx, e.Condition)
if err != nil {
return nil, errors.Trace(err)
}
if match {
return srcRow, nil
}
}
}