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Merge pull request #7540 from GuptaManan100/show-meta-database-name
Fix Metadata in SHOW queries
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* | ||
| Copyright 2021 The Vitess Authors. | ||
| 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, | ||
| 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. | ||
| */ | ||
|
|
||
| package engine | ||
|
|
||
| import ( | ||
| "vitess.io/vitess/go/sqltypes" | ||
| querypb "vitess.io/vitess/go/vt/proto/query" | ||
| "vitess.io/vitess/go/vt/proto/vtrpc" | ||
| "vitess.io/vitess/go/vt/vterrors" | ||
| ) | ||
|
|
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| var _ Primitive = (*RenameFields)(nil) | ||
|
|
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| // RenameFields is a primitive that renames the fields | ||
| type RenameFields struct { | ||
| Cols []string | ||
| Indices []int | ||
| Input Primitive | ||
| noTxNeeded | ||
| } | ||
|
|
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| // NewRenameField creates a new rename field | ||
| func NewRenameField(cols []string, indices []int, input Primitive) (*RenameFields, error) { | ||
| if len(cols) != len(indices) { | ||
| return nil, vterrors.New(vtrpc.Code_INTERNAL, "Unequal length of columns and indices in RenameField primitive") | ||
| } | ||
| return &RenameFields{ | ||
| Cols: cols, | ||
| Indices: indices, | ||
| Input: input, | ||
| }, nil | ||
| } | ||
|
|
||
| // RouteType implements the primitive interface | ||
| func (r *RenameFields) RouteType() string { | ||
| return r.Input.RouteType() | ||
| } | ||
|
|
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| // GetKeyspaceName implements the primitive interface | ||
| func (r *RenameFields) GetKeyspaceName() string { | ||
| return r.Input.GetKeyspaceName() | ||
| } | ||
|
|
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| // GetTableName implements the primitive interface | ||
| func (r *RenameFields) GetTableName() string { | ||
| return r.Input.GetTableName() | ||
| } | ||
|
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| // Execute implements the primitive interface | ||
| func (r *RenameFields) Execute(vcursor VCursor, bindVars map[string]*querypb.BindVariable, wantfields bool) (*sqltypes.Result, error) { | ||
| qr, err := r.Input.Execute(vcursor, bindVars, wantfields) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if wantfields { | ||
| r.renameFields(qr) | ||
| } | ||
| return qr, nil | ||
| } | ||
|
|
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| func (r *RenameFields) renameFields(qr *sqltypes.Result) { | ||
| for ind, index := range r.Indices { | ||
| colName := r.Cols[ind] | ||
| qr.Fields[index].Name = colName | ||
| } | ||
| } | ||
|
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| // StreamExecute implements the primitive interface | ||
| func (r *RenameFields) StreamExecute(vcursor VCursor, bindVars map[string]*querypb.BindVariable, wantfields bool, callback func(*sqltypes.Result) error) error { | ||
| if wantfields { | ||
| innerCallback := callback | ||
| callback = func(result *sqltypes.Result) error { | ||
| r.renameFields(result) | ||
| return innerCallback(result) | ||
| } | ||
| } | ||
| return r.Input.StreamExecute(vcursor, bindVars, wantfields, callback) | ||
| } | ||
|
|
||
| // GetFields implements the primitive interface | ||
| func (r *RenameFields) GetFields(vcursor VCursor, bindVars map[string]*querypb.BindVariable) (*sqltypes.Result, error) { | ||
| qr, err := r.Input.GetFields(vcursor, bindVars) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| r.renameFields(qr) | ||
| return qr, nil | ||
| } | ||
|
|
||
| // Inputs implements the primitive interface | ||
| func (r *RenameFields) Inputs() []Primitive { | ||
| return []Primitive{r.Input} | ||
| } | ||
|
|
||
| // description implements the primitive interface | ||
| func (r *RenameFields) description() PrimitiveDescription { | ||
| return PrimitiveDescription{ | ||
| OperatorType: "RenameFields", | ||
| Other: map[string]interface{}{ | ||
| "Indices": r.Indices, | ||
| "Columns": r.Cols, | ||
| }, | ||
| } | ||
| } |
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