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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,200 @@ | ||
| // 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 | ||
|
|
||
| import ( | ||
| "github.com/juju/errors" | ||
| "github.com/pingcap/tidb/expression" | ||
| "github.com/pingcap/tidb/kv" | ||
| "github.com/pingcap/tidb/model" | ||
| "github.com/pingcap/tidb/mysql" | ||
| "github.com/pingcap/tidb/plan" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/table" | ||
| "github.com/pingcap/tidb/table/tables" | ||
| "github.com/pingcap/tidb/tablecodec" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "github.com/pingcap/tidb/util/codec" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| func (b *executorBuilder) buildPointGet(p *plan.PointGetPlan) Executor { | ||
| return &PointGetExecutor{ | ||
| ctx: b.ctx, | ||
| schema: p.Schema(), | ||
| tblInfo: p.TblInfo, | ||
| idxInfo: p.IndexInfo, | ||
| idxVals: p.IndexValues, | ||
| handle: p.Handle, | ||
| startTS: b.getStartTS(), | ||
| } | ||
| } | ||
|
|
||
| // PointGetExecutor executes point select query. | ||
| type PointGetExecutor struct { | ||
| ctx sessionctx.Context | ||
| schema *expression.Schema | ||
| tps []*types.FieldType | ||
| tblInfo *model.TableInfo | ||
| handle int64 | ||
| idxInfo *model.IndexInfo | ||
| idxVals []types.Datum | ||
| startTS uint64 | ||
| snapshot kv.Snapshot | ||
| done bool | ||
| } | ||
|
|
||
| // Open implements the Executor interface. | ||
| func (e *PointGetExecutor) Open(context.Context) error { | ||
| return nil | ||
| } | ||
|
|
||
| // Close implements the Executor interface. | ||
| func (e *PointGetExecutor) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| // Next implements the Executor interface. | ||
| func (e *PointGetExecutor) Next(ctx context.Context, chk *chunk.Chunk) error { | ||
| chk.Reset() | ||
| if e.done { | ||
| return nil | ||
| } | ||
| e.done = true | ||
| var err error | ||
| e.snapshot, err = e.ctx.GetStore().GetSnapshot(kv.Version{Ver: e.startTS}) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if e.idxInfo != nil { | ||
| idxKey, err1 := e.encodeIndexKey() | ||
| if err1 != nil { | ||
| return errors.Trace(err1) | ||
| } | ||
| handleVal, err1 := e.get(idxKey) | ||
| if err1 != nil && !kv.ErrNotExist.Equal(err1) { | ||
| return errors.Trace(err1) | ||
| } | ||
| if len(handleVal) == 0 { | ||
| return nil | ||
| } | ||
| e.handle, err1 = tables.DecodeHandle(handleVal) | ||
| if err1 != nil { | ||
| return errors.Trace(err1) | ||
| } | ||
| } | ||
| key := tablecodec.EncodeRowKeyWithHandle(e.tblInfo.ID, e.handle) | ||
| val, err := e.get(key) | ||
| if err != nil && !kv.ErrNotExist.Equal(err) { | ||
| return errors.Trace(err) | ||
| } | ||
| if len(val) == 0 { | ||
| if e.idxInfo != nil { | ||
| return kv.ErrNotExist.Gen("inconsistent extra index %s, handle %d not found in table", | ||
| e.idxInfo.Name.O, e.handle) | ||
| } | ||
| return nil | ||
| } | ||
| return e.decodeRowValToChunk(val, chk) | ||
| } | ||
|
|
||
| func (e *PointGetExecutor) encodeIndexKey() ([]byte, error) { | ||
| for i := range e.idxVals { | ||
| colInfo := e.tblInfo.Columns[e.idxInfo.Columns[i].Offset] | ||
| casted, err := table.CastValue(e.ctx, e.idxVals[i], colInfo) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| e.idxVals[i] = casted | ||
| } | ||
| encodedIdxVals, err := codec.EncodeKey(e.ctx.GetSessionVars().StmtCtx, nil, e.idxVals...) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| return tablecodec.EncodeIndexSeekKey(e.tblInfo.ID, e.idxInfo.ID, encodedIdxVals), nil | ||
| } | ||
|
|
||
| func (e *PointGetExecutor) get(key kv.Key) (val []byte, err error) { | ||
| txn := e.ctx.Txn() | ||
| if txn != nil && txn.Valid() && !txn.IsReadOnly() { | ||
| return txn.Get(key) | ||
| } | ||
| return e.snapshot.Get(key) | ||
| } | ||
|
|
||
| func (e *PointGetExecutor) decodeRowValToChunk(rowVal []byte, chk *chunk.Chunk) error { | ||
| colIDs := make(map[int64]int, e.schema.Len()) | ||
| for i, col := range e.schema.Columns { | ||
| colIDs[col.ID] = i | ||
| } | ||
| colVals, err := tablecodec.CutRowNew(rowVal, colIDs) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| decoder := codec.NewDecoder(chk, e.ctx.GetSessionVars().Location()) | ||
| for id, offset := range colIDs { | ||
| if e.tblInfo.PKIsHandle && mysql.HasPriKeyFlag(e.schema.Columns[offset].RetType.Flag) { | ||
| chk.AppendInt64(offset, e.handle) | ||
| continue | ||
| } | ||
| if id == model.ExtraHandleID { | ||
| chk.AppendInt64(offset, e.handle) | ||
| continue | ||
| } | ||
| colVal := colVals[offset] | ||
| if len(colVal) == 0 { | ||
| colInfo := getColInfoByID(e.tblInfo, id) | ||
| d, err1 := table.GetColOriginDefaultValue(e.ctx, colInfo) | ||
| if err1 != nil { | ||
| return errors.Trace(err1) | ||
| } | ||
| chk.AppendDatum(offset, &d) | ||
| continue | ||
| } | ||
| _, err = decoder.DecodeOne(colVals[offset], offset, e.schema.Columns[offset].RetType) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func getColInfoByID(tbl *model.TableInfo, colID int64) *model.ColumnInfo { | ||
| for _, col := range tbl.Columns { | ||
| if col.ID == colID { | ||
| return col | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Schema implements the Executor interface. | ||
| func (e *PointGetExecutor) Schema() *expression.Schema { | ||
| return e.schema | ||
| } | ||
|
|
||
| func (e *PointGetExecutor) retTypes() []*types.FieldType { | ||
| if e.tps == nil { | ||
| e.tps = make([]*types.FieldType, e.schema.Len()) | ||
| for i := range e.schema.Columns { | ||
| e.tps[i] = e.schema.Columns[i].RetType | ||
| } | ||
| } | ||
| return e.tps | ||
| } | ||
|
|
||
| func (e *PointGetExecutor) newChunk() *chunk.Chunk { | ||
| return chunk.NewChunkWithCapacity(e.retTypes(), 1) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| // 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 *testSuite) TestPointGet(c *C) { | ||
| tk := testkit.NewTestKit(c, s.store) | ||
| tk.MustExec("use test") | ||
| tk.MustExec("create table point (id int primary key, c int, d varchar(10), unique c_d (c, d))") | ||
| tk.MustExec("insert point values (1, 1, 'a')") | ||
| tk.MustExec("insert point values (2, 2, 'b')") | ||
| tk.MustQuery("select * from point where id = 1 and c = 0").Check(testkit.Rows()) | ||
| tk.MustQuery("select * from point where id < 0 and c = 1 and d = 'b'").Check(testkit.Rows()) | ||
| result, err := tk.Exec("select id as ident from point where id = 1") | ||
| c.Assert(err, IsNil) | ||
| fields := result.Fields() | ||
| c.Assert(fields[0].ColumnAsName.O, Equals, "ident") | ||
|
|
||
| tk.MustExec("CREATE TABLE tab3(pk INTEGER PRIMARY KEY, col0 INTEGER, col1 FLOAT, col2 TEXT, col3 INTEGER, col4 FLOAT, col5 TEXT);") | ||
| tk.MustExec("CREATE UNIQUE INDEX idx_tab3_0 ON tab3 (col4);") | ||
| tk.MustExec("INSERT INTO tab3 VALUES(0,854,111.96,'mguub',711,966.36,'snwlo');") | ||
| tk.MustQuery("SELECT ALL * FROM tab3 WHERE col4 = 85;").Check(testkit.Rows()) | ||
| } |
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