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chunk: reduce chunk's iterator function call #7585

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merged 3 commits into from
Sep 3, 2018
Merged

chunk: reduce chunk's iterator function call #7585

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f2c4ba0
reduce chunk's iterator function call
crazycs520 Sep 3, 2018
3a24248
refine code for byte alignment
crazycs520 Sep 3, 2018
21b7179
Merge branch 'master' into opt-chunk-iterator
XuHuaiyu Sep 3, 2018
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20 changes: 11 additions & 9 deletions util/chunk/iterator.go
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Original file line number Diff line number Diff line change
Expand Up @@ -105,13 +105,15 @@ func NewIterator4Chunk(chk *Chunk) *Iterator4Chunk {

// Iterator4Chunk is used to iterate rows inside a chunk.
type Iterator4Chunk struct {
chk *Chunk
cursor int
chk *Chunk
cursor int32
numRows int32
}

// Begin implements the Iterator interface.
func (it *Iterator4Chunk) Begin() Row {
if it.chk.NumRows() == 0 {
it.numRows = int32(it.chk.NumRows())
if it.numRows == 0 {
return it.End()
}
it.cursor = 1
Expand All @@ -120,21 +122,21 @@ func (it *Iterator4Chunk) Begin() Row {

// Next implements the Iterator interface.
func (it *Iterator4Chunk) Next() Row {
if it.cursor >= it.chk.NumRows() {
it.cursor = it.chk.NumRows() + 1
if it.cursor >= it.numRows {
it.cursor = it.numRows + 1
return it.End()
}
row := it.chk.GetRow(it.cursor)
row := it.chk.GetRow(int(it.cursor))
it.cursor++
return row
}

// Current implements the Iterator interface.
func (it *Iterator4Chunk) Current() Row {
if it.cursor == 0 || it.cursor > it.Len() {
if it.cursor == 0 || int(it.cursor) > it.Len() {
return it.End()
}
return it.chk.GetRow(it.cursor - 1)
return it.chk.GetRow(int(it.cursor) - 1)
}

// End implements the Iterator interface.
Expand All @@ -144,7 +146,7 @@ func (it *Iterator4Chunk) End() Row {

// ReachEnd implements the Iterator interface.
func (it *Iterator4Chunk) ReachEnd() {
it.cursor = it.Len() + 1
it.cursor = int32(it.Len() + 1)
}

// Len implements the Iterator interface
Expand Down