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executor: support window func for aggregate without frame clause
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| // Copyright 2019 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package executor | ||
|
|
||
| import ( | ||
| "context" | ||
| "time" | ||
|
|
||
| "github.com/opentracing/opentracing-go" | ||
| "github.com/pingcap/errors" | ||
| "github.com/pingcap/tidb/executor/windowfuncs" | ||
| "github.com/pingcap/tidb/expression" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| ) | ||
|
|
||
| // WindowExec is the executor for window functions. | ||
| type WindowExec struct { | ||
| baseExecutor | ||
|
|
||
| groupChecker *groupChecker | ||
| inputIter *chunk.Iterator4Chunk | ||
| inputRow chunk.Row | ||
| groupRows []chunk.Row | ||
| childResults []*chunk.Chunk | ||
| windowFunc windowfuncs.WindowFunc | ||
| executed bool | ||
| childCols []*expression.Column | ||
| } | ||
|
|
||
| // Close implements the Executor Close interface. | ||
| func (e *WindowExec) Close() error { | ||
| e.childResults = nil | ||
| return errors.Trace(e.baseExecutor.Close()) | ||
| } | ||
|
|
||
| // Next implements the Executor Next interface. | ||
| func (e *WindowExec) Next(ctx context.Context, chk *chunk.Chunk) error { | ||
| if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil { | ||
| span1 := span.Tracer().StartSpan("windowExec.Next", opentracing.ChildOf(span.Context())) | ||
| defer span1.Finish() | ||
| } | ||
| if e.runtimeStats != nil { | ||
| start := time.Now() | ||
| defer func() { e.runtimeStats.Record(time.Now().Sub(start), chk.NumRows()) }() | ||
| } | ||
| chk.Reset() | ||
| if e.windowFunc.HasRemainingResults() { | ||
| e.appendResult2Chunk(chk) | ||
| } | ||
| for !e.executed && (chk.NumRows() == 0 || chk.RemainedRows(chk.NumCols()-1) > 0) { | ||
| err := e.consumeOneGroup(ctx, chk) | ||
| if err != nil { | ||
| e.executed = true | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (e *WindowExec) consumeOneGroup(ctx context.Context, chk *chunk.Chunk) error { | ||
| for !e.executed { | ||
| if err := e.fetchChildIfNecessary(ctx, chk); err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| for ; e.inputRow != e.inputIter.End(); e.inputRow = e.inputIter.Next() { | ||
| meetNewGroup, err := e.groupChecker.meetNewGroup(e.inputRow) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if meetNewGroup { | ||
| err := e.consumeGroupRows(chk) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| err = e.appendResult2Chunk(chk) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| e.groupRows = append(e.groupRows, e.inputRow) | ||
| if meetNewGroup { | ||
| e.inputRow = e.inputIter.Next() | ||
| return nil | ||
| } | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (e *WindowExec) consumeGroupRows(chk *chunk.Chunk) error { | ||
| if len(e.groupRows) == 0 { | ||
| return nil | ||
| } | ||
| e.copyChk(chk) | ||
| var err error | ||
| e.groupRows, err = e.windowFunc.ProcessOneChunk(e.ctx, e.groupRows, chk) | ||
| return err | ||
| } | ||
|
|
||
| func (e *WindowExec) fetchChildIfNecessary(ctx context.Context, chk *chunk.Chunk) (err error) { | ||
| if e.inputIter != nil && e.inputRow != e.inputIter.End() { | ||
| return nil | ||
| } | ||
|
|
||
| // Before fetching a new batch of input, we should consume the last groupChecker. | ||
| err = e.consumeGroupRows(chk) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| childResult := e.children[0].newFirstChunk() | ||
| err = e.children[0].Next(ctx, childResult) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| e.childResults = append(e.childResults, childResult) | ||
| // No more data. | ||
| if childResult.NumRows() == 0 { | ||
| e.executed = true | ||
| err = e.appendResult2Chunk(chk) | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| e.inputIter = chunk.NewIterator4Chunk(childResult) | ||
| e.inputRow = e.inputIter.Begin() | ||
| return nil | ||
| } | ||
|
|
||
| // appendResult2Chunk appends result of all the aggregation functions to the | ||
| // result chunk, and reset the evaluation context for each aggregation. | ||
| func (e *WindowExec) appendResult2Chunk(chk *chunk.Chunk) error { | ||
| e.copyChk(chk) | ||
| var err error | ||
| e.groupRows, err = e.windowFunc.ExhaustResult(e.ctx, e.groupRows, chk) | ||
| return err | ||
| } | ||
|
|
||
| func (e *WindowExec) copyChk(chk *chunk.Chunk) { | ||
| if len(e.childResults) == 0 || chk.NumRows() > 0 { | ||
| return | ||
| } | ||
| childResult := e.childResults[0] | ||
| e.childResults = e.childResults[1:] | ||
| for i, col := range e.childCols { | ||
| chk.CopyColumns(childResult, i, col.Index) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,41 @@ | ||
| // Copyright 2018 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package executor_test | ||
|
|
||
| import ( | ||
| . "github.com/pingcap/check" | ||
| "github.com/pingcap/tidb/util/testkit" | ||
| ) | ||
|
|
||
| func (s *testSuite2) TestWindowFunctions(c *C) { | ||
| tk := testkit.NewTestKit(c, s.store) | ||
| tk.MustExec("use test") | ||
| tk.MustExec("drop table if exists t") | ||
| tk.MustExec("create table t (a int, b int, c int)") | ||
| tk.MustExec("set @@tidb_enable_window_function = 1") | ||
| defer func() { | ||
| tk.MustExec("set @@tidb_enable_window_function = 0") | ||
| }() | ||
| tk.MustExec("insert into t values (1,2,3),(4,3,2),(2,3,4)") | ||
| result := tk.MustQuery("select count(a) over () from t") | ||
| result.Check(testkit.Rows("3", "3", "3")) | ||
| result = tk.MustQuery("select sum(a) over () + count(a) over () from t") | ||
| result.Check(testkit.Rows("10", "10", "10")) | ||
| result = tk.MustQuery("select sum(a) over (partition by a) from t") | ||
| result.Check(testkit.Rows("1", "2", "4")) | ||
| result = tk.MustQuery("select 1 + sum(a) over (), count(a) over () from t") | ||
| result.Check(testkit.Rows("8 3", "8 3", "8 3")) | ||
| result = tk.MustQuery("select sum(t1.a) over() from t t1, t t2") | ||
| result.Check(testkit.Rows("21", "21", "21", "21", "21", "21", "21", "21", "21")) | ||
| } |
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