forked from dolthub/go-mysql-server
/
analyze.go
131 lines (108 loc) · 2.89 KB
/
analyze.go
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package plan
import (
"fmt"
"io"
"strings"
"github.com/gabereiser/go-mysql-server/sql"
"github.com/gabereiser/go-mysql-server/sql/types"
)
type AnalyzeTable struct {
Db string
Stats sql.StatsReadWriter
Tables []sql.DbTable
}
var analyzeSchema = sql.Schema{
{Name: "Table", Type: types.LongText},
{Name: "Op", Type: types.LongText},
{Name: "Msg_type", Type: types.LongText},
{Name: "Msg_text", Type: types.LongText},
}
func NewAnalyze(names []sql.DbTable) *AnalyzeTable {
return &AnalyzeTable{
Tables: names,
}
}
// Schema implements the interface sql.Node.
// TODO: should be |Tables|Op|Msg_type|Msg_text|
func (n *AnalyzeTable) Schema() sql.Schema {
return analyzeSchema
}
func (n *AnalyzeTable) WithCatalog(cat sql.Catalog) *AnalyzeTable {
ret := *n
ret.Stats = ret.Stats.AssignCatalog(cat).(sql.StatsReadWriter)
return &ret
}
func (n *AnalyzeTable) WithTables(tables []sql.DbTable) *AnalyzeTable {
n.Tables = tables
return n
}
func (n *AnalyzeTable) WithDb(db string) *AnalyzeTable {
n.Db = db
return n
}
func (n *AnalyzeTable) WithStats(stats sql.StatsReadWriter) *AnalyzeTable {
n.Stats = stats
return n
}
// String implements the interface sql.Node.
func (n *AnalyzeTable) String() string {
tblNames := make([]string, len(n.Tables))
for i, t := range n.Tables {
tblNames[i] = t.String()
}
return fmt.Sprintf("AnalyzeTable table %s", strings.Join(tblNames, ", "))
}
// Resolved implements the Resolvable interface.
func (n *AnalyzeTable) Resolved() bool {
return n.Stats != nil
}
// Children implements the interface sql.Node.
func (n *AnalyzeTable) Children() []sql.Node {
return nil
}
// WithChildren implements the interface sql.Node.
func (n *AnalyzeTable) WithChildren(_ ...sql.Node) (sql.Node, error) {
return n, nil
}
// CheckPrivileges implements the interface sql.Node.
func (n *AnalyzeTable) CheckPrivileges(ctx *sql.Context, opChecker sql.PrivilegedOperationChecker) bool {
return true
}
// RowIter implements the interface sql.Node.
// TODO: support cross / multi db analyze
func (n *AnalyzeTable) RowIter(ctx *sql.Context, row sql.Row) (sql.RowIter, error) {
// Assume table is in current database
database := ctx.GetCurrentDatabase()
if database == "" {
return nil, sql.ErrNoDatabaseSelected.New()
}
return &analyzeTableIter{
idx: 0,
tables: n.Tables,
stats: n.Stats,
}, nil
}
type analyzeTableIter struct {
idx int
tables []sql.DbTable
stats sql.StatsReadWriter
}
var _ sql.RowIter = &analyzeTableIter{}
func (itr *analyzeTableIter) Next(ctx *sql.Context) (sql.Row, error) {
if itr.idx >= len(itr.tables) {
return nil, io.EOF
}
t := itr.tables[itr.idx]
msgType := "status"
msgText := "OK"
err := itr.stats.Analyze(ctx, t.Db, t.Table)
if err != nil {
msgType = "Error"
msgText = err.Error()
}
itr.idx++
return sql.Row{t.Table, "analyze", msgType, msgText}, nil
}
func (itr *analyzeTableIter) Close(ctx *sql.Context) error {
return nil
}