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show.go
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show.go
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// Copyright 2020 Pilosa Corp.
//
// 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 sql
import (
"context"
"fmt"
"github.com/pilosa/pilosa/v2"
pproto "github.com/pilosa/pilosa/v2/proto"
"github.com/pkg/errors"
"vitess.io/vitess/go/vt/sqlparser"
)
// ShowHandler executes SQL show table/field statements
type ShowHandler struct {
api *pilosa.API
}
// NewShowHandler constructor
func NewShowHandler(api *pilosa.API) *ShowHandler {
return &ShowHandler{
api: api,
}
}
// Handle executes mapped SQL
func (s *ShowHandler) Handle(ctx context.Context, mapped *MappedSQL) (pproto.ToRowser, error) {
stmt, ok := mapped.Statement.(*sqlparser.Show)
if !ok {
return nil, fmt.Errorf("statement is not type show: %T", mapped.Statement)
}
switch stmt.Type {
case "tables":
return s.execShowTables(ctx, stmt)
case "fields":
return s.execShowFields(ctx, stmt)
default:
return nil, fmt.Errorf("cannot show: %s", stmt.Type)
}
}
func (s *ShowHandler) execShowTables(ctx context.Context, showStmt *sqlparser.Show) (pproto.ToRowser, error) {
indexInfo := s.api.Schema(ctx)
result := make(pproto.ConstRowser, len(indexInfo))
for i, ii := range indexInfo {
result[i] = pproto.RowResponse{
Headers: []*pproto.ColumnInfo{
{Name: "Table", Datatype: "string"},
},
Columns: []*pproto.ColumnResponse{
{ColumnVal: &pproto.ColumnResponse_StringVal{StringVal: ii.Name}},
},
}
}
// Sort the result.
return OrderBy(result, []string{"Table"}, []string{"asc"}), nil
}
func (s *ShowHandler) execShowFields(ctx context.Context, showStmt *sqlparser.Show) (pproto.ToRowser, error) {
indexName := showStmt.OnTable.ToViewName().Name.String()
index, err := s.api.Index(ctx, indexName)
if err != nil {
return nil, errors.Wrap(err, "getting schema")
}
if index == nil {
return nil, errors.WithMessage(pilosa.ErrIndexNotFound, indexName)
}
fields := index.Fields()
result := make(pproto.ConstRowser, 0, len(fields))
for _, f := range fields {
if f.Name() == "_exists" {
continue
}
typeName := f.Type()
if f.Keys() {
typeName = "keyed-" + typeName
}
if f.ForeignIndex() != "" {
typeName = "foreign-" + typeName
}
result = append(result, pproto.RowResponse{
Headers: []*pproto.ColumnInfo{
{Name: "Field", Datatype: "string"},
{Name: "Type", Datatype: "string"},
},
Columns: []*pproto.ColumnResponse{
{ColumnVal: &pproto.ColumnResponse_StringVal{StringVal: f.Name()}},
{ColumnVal: &pproto.ColumnResponse_StringVal{StringVal: typeName}},
},
})
}
// Sort the result.
return OrderBy(result, []string{"Field"}, []string{"asc"}), nil
}