Add support for Union All #6351
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,13 @@ | ||
| package utils | ||
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| import ( | ||
| "sort" | ||
| "strings" | ||
| ) | ||
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| //SortString sorts the string. | ||
| func SortString(w string) string { | ||
| s := strings.Split(w, "") | ||
| sort.Strings(s) | ||
| return strings.Join(s, "") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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@@ -50,6 +50,7 @@ type ( | |
| iInsertRows() | ||
| AddOrder(*Order) | ||
| SetLimit(*Limit) | ||
| SetLock(lock string) | ||
| SQLNode | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| /* | ||
| Copyright 2020 The Vitess Authors. | ||
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| 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 | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package engine | ||
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| import ( | ||
| "sort" | ||
| "strings" | ||
| "sync" | ||
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| "vitess.io/vitess/go/mysql" | ||
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| "vitess.io/vitess/go/sqltypes" | ||
| querypb "vitess.io/vitess/go/vt/proto/query" | ||
| vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc" | ||
| "vitess.io/vitess/go/vt/vterrors" | ||
| ) | ||
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| // Concatenate Primitive is used to concatenate results from multiple sources. | ||
| var _ Primitive = (*Concatenate)(nil) | ||
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| //Concatenate specified the parameter for concatenate primitive | ||
| type Concatenate struct { | ||
| Sources []Primitive | ||
| } | ||
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| //RouteType returns a description of the query routing type used by the primitive | ||
| func (c *Concatenate) RouteType() string { | ||
| return "Concatenate" | ||
| } | ||
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| // GetKeyspaceName specifies the Keyspace that this primitive routes to | ||
| func (c *Concatenate) GetKeyspaceName() string { | ||
| ksMap := map[string]interface{}{} | ||
| for _, source := range c.Sources { | ||
| ksMap[source.GetKeyspaceName()] = nil | ||
| } | ||
| var ksArr []string | ||
| for ks := range ksMap { | ||
| ksArr = append(ksArr, ks) | ||
| } | ||
| sort.Strings(ksArr) | ||
| return strings.Join(ksArr, "_") | ||
| } | ||
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| // GetTableName specifies the table that this primitive routes to. | ||
| func (c *Concatenate) GetTableName() string { | ||
| var tabArr []string | ||
| for _, source := range c.Sources { | ||
| tabArr = append(tabArr, source.GetTableName()) | ||
| } | ||
| return strings.Join(tabArr, "_") | ||
| } | ||
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| // Execute performs a non-streaming exec. | ||
| func (c *Concatenate) Execute(vcursor VCursor, bindVars map[string]*querypb.BindVariable, wantfields bool) (*sqltypes.Result, error) { | ||
| result := &sqltypes.Result{} | ||
| var wg sync.WaitGroup | ||
| qrs := make([]*sqltypes.Result, len(c.Sources)) | ||
| errs := make([]error, len(c.Sources)) | ||
| for i, source := range c.Sources { | ||
| wg.Add(1) | ||
| go func(i int, source Primitive) { | ||
| defer wg.Done() | ||
| qrs[i], errs[i] = source.Execute(vcursor, bindVars, wantfields) | ||
| }(i, source) | ||
| } | ||
| wg.Wait() | ||
| for i := 0; i < len(c.Sources); i++ { | ||
| if errs[i] != nil { | ||
| return nil, vterrors.Wrap(errs[i], "Concatenate.Execute") | ||
| } | ||
| qr := qrs[i] | ||
| if result.Fields == nil { | ||
| result.Fields = qr.Fields | ||
| } | ||
| err := compareFields(result.Fields, qr.Fields) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if len(qr.Rows) > 0 { | ||
| result.Rows = append(result.Rows, qr.Rows...) | ||
| if len(result.Rows[0]) != len(qr.Rows[0]) { | ||
| return nil, mysql.NewSQLError(mysql.ERWrongNumberOfColumnsInSelect, "21000", "The used SELECT statements have a different number of columns") | ||
| } | ||
| result.RowsAffected += qr.RowsAffected | ||
| } | ||
| } | ||
| return result, nil | ||
| } | ||
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| // StreamExecute performs a streaming exec. | ||
| func (c *Concatenate) StreamExecute(vcursor VCursor, bindVars map[string]*querypb.BindVariable, wantfields bool, callback func(*sqltypes.Result) error) error { | ||
| var seenFields []*querypb.Field | ||
| var fieldset sync.WaitGroup | ||
| fieldsSent := false | ||
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| g := vcursor.ErrorGroupCancellableContext() | ||
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| fieldset.Add(1) | ||
| var mu sync.Mutex | ||
| for i, source := range c.Sources { | ||
| i, source := i, source | ||
| g.Go(func() error { | ||
| err := source.StreamExecute(vcursor, bindVars, wantfields, func(resultChunk *sqltypes.Result) error { | ||
| // if we have fields to compare, make sure all the fields are all the same | ||
| if i == 0 && !fieldsSent { | ||
| defer fieldset.Done() | ||
| seenFields = resultChunk.Fields | ||
| fieldsSent = true | ||
| // No other call can happen before this call. | ||
| return callback(resultChunk) | ||
| } | ||
| fieldset.Wait() | ||
| if resultChunk.Fields != nil { | ||
| err := compareFields(seenFields, resultChunk.Fields) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| } | ||
| // This to ensure only one send happens back to the client. | ||
| mu.Lock() | ||
| defer mu.Unlock() | ||
| select { | ||
| case <-vcursor.Context().Done(): | ||
| return nil | ||
| default: | ||
| return callback(resultChunk) | ||
| } | ||
| }) | ||
| // This is to ensure other streams complete if the first stream failed to unlock the wait. | ||
| if i == 0 && !fieldsSent { | ||
| fieldset.Done() | ||
| } | ||
| return err | ||
| }) | ||
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| } | ||
| if err := g.Wait(); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
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| // GetFields fetches the field info. | ||
| func (c *Concatenate) GetFields(vcursor VCursor, bindVars map[string]*querypb.BindVariable) (*sqltypes.Result, error) { | ||
| firstQr, err := c.Sources[0].GetFields(vcursor, bindVars) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| for i, source := range c.Sources { | ||
| if i == 0 { | ||
| continue | ||
| } | ||
| qr, err := source.GetFields(vcursor, bindVars) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| err = compareFields(firstQr.Fields, qr.Fields) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| return firstQr, nil | ||
| } | ||
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| //NeedsTransaction returns whether a transaction is needed for this primitive | ||
| func (c *Concatenate) NeedsTransaction() bool { | ||
| for _, source := range c.Sources { | ||
| if source.NeedsTransaction() { | ||
| return true | ||
| } | ||
| } | ||
| return false | ||
| } | ||
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| // Inputs returns the input primitives for this | ||
| func (c *Concatenate) Inputs() []Primitive { | ||
| return c.Sources | ||
| } | ||
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| func (c *Concatenate) description() PrimitiveDescription { | ||
| return PrimitiveDescription{OperatorType: c.RouteType()} | ||
| } | ||
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| func compareFields(fields1 []*querypb.Field, fields2 []*querypb.Field) error { | ||
| if len(fields1) != len(fields2) { | ||
| return mysql.NewSQLError(mysql.ERWrongNumberOfColumnsInSelect, "21000", "The used SELECT statements have a different number of columns") | ||
| } | ||
| for i, field2 := range fields2 { | ||
| field1 := fields1[i] | ||
| if field1.Type != field2.Type { | ||
| return vterrors.Errorf(vtrpcpb.Code_INVALID_ARGUMENT, "column field type does not match for name: (%v, %v) types: (%v, %v)", field1.Name, field2.Name, field1.Type, field2.Type) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
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