5c9eced880
* chunk: add Iterator interface. This abstraction allowed algorithm like join result generator to iterator chunk rows in different form. * *: address comment
74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
// Copyright 2017 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package chunk
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import (
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"github.com/pingcap/check"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/types"
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)
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func (s *testChunkSuite) TestIterator(c *check.C) {
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fields := []*types.FieldType{types.NewFieldType(mysql.TypeLonglong)}
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chk := NewChunk(fields)
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n := 10
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var expected []int64
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for i := 0; i < n; i++ {
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chk.AppendInt64(0, int64(i))
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expected = append(expected, int64(i))
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}
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var rows []Row
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li := NewList(fields, 1)
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li2 := NewList(fields, 5)
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var ptrs []RowPtr
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var ptrs2 []RowPtr
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for i := 0; i < n; i++ {
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rows = append(rows, chk.GetRow(i))
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ptr := li.AppendRow(chk.GetRow(i))
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ptrs = append(ptrs, ptr)
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ptr2 := li2.AppendRow(chk.GetRow(i))
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ptrs2 = append(ptrs2, ptr2)
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}
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it := NewSliceIterator(rows)
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checkIterator(c, it, expected)
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it = NewChunkIterator(chk)
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checkIterator(c, it, expected)
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it = NewListIterator(li)
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checkIterator(c, it, expected)
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it = NewRowPtrIterator(li, ptrs)
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checkIterator(c, it, expected)
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it = NewListIterator(li2)
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checkIterator(c, it, expected)
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it = NewRowPtrIterator(li2, ptrs2)
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checkIterator(c, it, expected)
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it = NewSliceIterator(nil)
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c.Assert(it.Begin(), check.Equals, it.End())
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it = NewChunkIterator(new(Chunk))
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c.Assert(it.Begin(), check.Equals, it.End())
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it = NewListIterator(new(List))
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c.Assert(it.Begin(), check.Equals, it.End())
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it = NewRowPtrIterator(li, nil)
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c.Assert(it.Begin(), check.Equals, it.End())
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}
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func checkIterator(c *check.C, it Iterator, expected []int64) {
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var got []int64
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for row := it.Begin(); row != it.End(); row = it.Next() {
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got = append(got, row.GetInt64(0))
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}
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c.Assert(got, check.DeepEquals, expected)
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}
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