// Next implements plan.Plan Next interface.
func (r *HavingPlan) Next(ctx context.Context) (row *plan.Row, err error) {
if r.evalArgs == nil {
r.evalArgs = map[interface{}]interface{}{}
}
for {
var srcRow *plan.Row
srcRow, err = r.Src.Next(ctx)
if srcRow == nil || err != nil {
return nil, errors.Trace(err)
}
r.evalArgs[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
v, err0 := GetIdentValue(name, r.Src.GetFields(), srcRow.Data, field.CheckFieldFlag)
if err0 == nil {
return v, nil
}
// try to find in outer query
return getIdentValueFromOuterQuery(ctx, name)
}
r.evalArgs[expression.ExprEvalPositionFunc] = func(position int) (interface{}, error) {
// position is in [1, len(fields)], so we must decrease 1 to get correct index
// TODO: check position invalidation
return srcRow.Data[position-1], nil
}
var v bool
v, err = expression.EvalBoolExpr(ctx, r.Expr, r.evalArgs)
if err != nil {
return nil, errors.Trace(err)
}
if v {
row = srcRow
return
}
}
}
func (r *JoinPlan) nextCrossJoin(ctx context.Context) (row *plan.Row, err error) {
for {
if r.curRow == nil {
r.curRow, err = r.Left.Next(ctx)
if err != nil {
return nil, errors.Trace(err)
}
if r.curRow == nil {
return nil, nil
}
if r.On != nil {
tempExpr := r.On.Clone()
visitor := NewIdentEvalVisitor(r.Left.GetFields(), r.curRow.Data)
_, err = tempExpr.Accept(visitor)
if err != nil {
return nil, errors.Trace(err)
}
var filtered bool
r.tempPlan, filtered, err = r.Right.Filter(ctx, tempExpr)
if filtered {
log.Debugf("cross join use index")
}
} else {
r.tempPlan = r.Right
}
}
var rightRow *plan.Row
rightRow, err = r.tempPlan.Next(ctx)
if err != nil {
return nil, errors.Trace(err)
}
if rightRow == nil {
r.curRow = nil
r.tempPlan.Close()
continue
}
joinedRow := append(r.curRow.Data, rightRow.Data...)
if r.On != nil {
r.evalArgs[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
return GetIdentValue(name, r.Fields, joinedRow, field.DefaultFieldFlag)
}
b, err := expression.EvalBoolExpr(ctx, r.On, r.evalArgs)
if err != nil {
return nil, errors.Trace(err)
}
if !b {
// If On condition not satisified, drop this row
continue
}
}
row = &plan.Row{
Data: joinedRow,
RowKeys: append(r.curRow.RowKeys, rightRow.RowKeys...),
}
return
}
}
func (r *JoinPlan) findMatchedRows(ctx context.Context, row *plan.Row, p plan.Plan, right bool) (err error) {
r.cursor = 0
r.matchedRows = nil
p.Close()
for {
var cmpRow *plan.Row
cmpRow, err = p.Next(ctx)
if err != nil {
return errors.Trace(err)
}
if cmpRow == nil {
break
}
// Do append(s1, s2) safely. Sometime the s1 capability is larger than its real length, so
// multi append may overwrite last valid data, e.g,
// s1 = make([]interface{}, 0, 1)
// s = append(s1, []interface{}{1})
// ss = append(ss, s)
// s = append(s1, []interface{}{2})
// ss = append(ss, s)
// We will see that ss only contains 2.
joined := make([]interface{}, 0, len(cmpRow.Data)+len(row.Data))
if right {
joined = append(append(joined, cmpRow.Data...), row.Data...)
} else {
joined = append(append(joined, row.Data...), cmpRow.Data...)
}
r.evalArgs[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
return GetIdentValue(name, r.Fields, joined, field.DefaultFieldFlag)
}
var b bool
b, err = expression.EvalBoolExpr(ctx, r.On, r.evalArgs)
if err != nil {
return errors.Trace(err)
}
if b {
cmpRow.Data = joined
keys := make([]*plan.RowKeyEntry, 0, len(row.RowKeys)+len(cmpRow.RowKeys))
cmpRow.RowKeys = append(append(keys, row.RowKeys...), cmpRow.RowKeys...)
r.matchedRows = append(r.matchedRows, cmpRow)
}
}
if len(r.matchedRows) == 0 {
if right {
leftLen := len(r.Fields) - len(r.Right.GetFields())
row.Data = append(make([]interface{}, leftLen), row.Data...)
} else {
rightLen := len(r.Fields) - len(r.Left.GetFields())
row.Data = append(row.Data, make([]interface{}, rightLen)...)
}
r.matchedRows = append(r.matchedRows, row)
}
return nil
}
func (s *ShowPlan) evalCondition(ctx context.Context, m map[interface{}]interface{}) (bool, error) {
var cond expression.Expression
if s.Pattern != nil {
cond = s.Pattern
} else if s.Where != nil {
cond = s.Where
}
if cond == nil {
return true, nil
}
return expression.EvalBoolExpr(ctx, cond, m)
}
func (r *JoinPlan) findMatchedRows(ctx context.Context, row *plan.Row, right bool) (err error) {
var p plan.Plan
if right {
p = r.Left
} else {
p = r.Right
}
r.cursor = 0
r.matchedRows = nil
p.Close()
for {
var cmpRow *plan.Row
cmpRow, err = p.Next(ctx)
if err != nil {
return errors.Trace(err)
}
if cmpRow == nil {
break
}
var joined []interface{}
if right {
joined = append(cmpRow.Data, row.Data...)
} else {
joined = append(row.Data, cmpRow.Data...)
}
r.evalArgs[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
return GetIdentValue(name, r.Fields, joined, field.DefaultFieldFlag)
}
var b bool
b, err = expression.EvalBoolExpr(ctx, r.On, r.evalArgs)
if err != nil {
return errors.Trace(err)
}
if b {
cmpRow.Data = joined
cmpRow.RowKeys = append(row.RowKeys, cmpRow.RowKeys...)
r.matchedRows = append(r.matchedRows, cmpRow)
}
}
if len(r.matchedRows) == 0 {
if right {
leftLen := len(r.Fields) - len(r.Right.GetFields())
row.Data = append(make([]interface{}, leftLen), row.Data...)
} else {
rightLen := len(r.Fields) - len(r.Left.GetFields())
row.Data = append(row.Data, make([]interface{}, rightLen)...)
}
r.matchedRows = append(r.matchedRows, row)
}
return nil
}
func (s *DeleteStmt) hitWhere(ctx context.Context, fields []*field.ResultField, data []interface{}) (bool, error) {
if s.Where == nil {
return true, nil
}
m := map[interface{}]interface{}{}
m[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
return plans.GetIdentValue(name, fields, data, field.DefaultFieldFlag)
}
ok, err := expression.EvalBoolExpr(ctx, s.Where, m)
if err != nil {
return false, errors.Trace(err)
}
return ok, nil
}
func (s *DeleteStmt) hitWhere(ctx context.Context, t table.Table, data []interface{}) (bool, error) {
if s.Where == nil {
return true, nil
}
m := map[interface{}]interface{}{}
// Set parameter for evaluating expression.
for _, col := range t.Cols() {
m[col.Name.L] = data[col.Offset]
}
ok, err := expression.EvalBoolExpr(ctx, s.Where, m)
if err != nil {
return false, errors.Trace(err)
}
return ok, nil
}
func (r *JoinPlan) nextCrossJoin(ctx context.Context) (row *plan.Row, err error) {
for {
if r.curRow == nil {
r.curRow, err = r.Left.Next(ctx)
if err != nil {
return nil, errors.Trace(err)
}
if r.curRow == nil {
return nil, nil
}
}
var rightRow *plan.Row
rightRow, err = r.Right.Next(ctx)
if err != nil {
return nil, errors.Trace(err)
}
if rightRow == nil {
r.curRow = nil
r.Right.Close()
continue
}
joinedRow := append(r.curRow.Data, rightRow.Data...)
if r.On != nil {
r.evalArgs[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
return GetIdentValue(name, r.Fields, joinedRow, field.DefaultFieldFlag)
}
b, err := expression.EvalBoolExpr(ctx, r.On, r.evalArgs)
if err != nil {
return nil, errors.Trace(err)
}
if !b {
// If On condition not satisified, drop this row
continue
}
}
row = &plan.Row{
Data: joinedRow,
RowKeys: append(r.curRow.RowKeys, rightRow.RowKeys...),
}
return
}
}
// Next implements plan.Plan Next interface.
func (r *HavingPlan) Next(ctx context.Context) (row *plan.Row, err error) {
if r.evalArgs == nil {
r.evalArgs = map[interface{}]interface{}{}
}
for {
var srcRow *plan.Row
srcRow, err = r.Src.Next(ctx)
if srcRow == nil || err != nil {
return nil, errors.Trace(err)
}
r.evalArgs[expression.ExprEvalIdentReferFunc] = func(name string, scope int, index int) (interface{}, error) {
if scope == expression.IdentReferFromTable {
return srcRow.FromData[index], nil
} else if scope == expression.IdentReferSelectList {
return srcRow.Data[index], nil
}
// try to find in outer query
return getIdentValueFromOuterQuery(ctx, name)
}
r.evalArgs[expression.ExprEvalPositionFunc] = func(position int) (interface{}, error) {
// position is in [1, len(fields)], so we must decrease 1 to get correct index
// TODO: check position invalidation
return srcRow.Data[position-1], nil
}
var v bool
v, err = expression.EvalBoolExpr(ctx, r.Expr, r.evalArgs)
if err != nil {
return nil, errors.Trace(err)
}
if v {
row = srcRow
return
}
}
}
func (s *ShowPlan) fetchAll(ctx context.Context) error {
// TODO split this function
switch s.Target {
case stmt.ShowEngines:
row := &plan.Row{
Data: []interface{}{"InnoDB", "DEFAULT", "Supports transactions, row-level locking, and foreign keys", "YES", "YES", "YES"},
}
s.rows = append(s.rows, row)
case stmt.ShowDatabases:
dbs := sessionctx.GetDomain(ctx).InfoSchema().AllSchemaNames()
// TODO: let information_schema be the first database
sort.Strings(dbs)
for _, d := range dbs {
s.rows = append(s.rows, &plan.Row{Data: []interface{}{d}})
}
case stmt.ShowTables:
is := sessionctx.GetDomain(ctx).InfoSchema()
dbName := model.NewCIStr(s.DBName)
if !is.SchemaExists(dbName) {
return errors.Errorf("Can not find DB: %s", dbName)
}
// sort for tables
var tableNames []string
for _, v := range is.SchemaTables(dbName) {
tableNames = append(tableNames, v.TableName().L)
}
sort.Strings(tableNames)
for _, v := range tableNames {
s.rows = append(s.rows, &plan.Row{Data: []interface{}{v}})
}
case stmt.ShowColumns:
is := sessionctx.GetDomain(ctx).InfoSchema()
dbName := model.NewCIStr(s.DBName)
if !is.SchemaExists(dbName) {
return errors.Errorf("Can not find DB: %s", dbName)
}
tbName := model.NewCIStr(s.TableName)
tb, err := is.TableByName(dbName, tbName)
if err != nil {
return errors.Errorf("Can not find table: %s", s.TableName)
}
cols := tb.Cols()
for _, col := range cols {
if !s.isColOK(col) {
continue
}
desc := column.NewColDesc(col)
// The FULL keyword causes the output to include the column collation and comments,
// as well as the privileges you have for each column.
row := &plan.Row{}
if s.Full {
row.Data = []interface{}{
desc.Field,
desc.Type,
desc.Collation,
desc.Null,
desc.Key,
desc.DefaultValue,
desc.Extra,
desc.Privileges,
desc.Comment,
}
} else {
row.Data = []interface{}{
desc.Field,
desc.Type,
desc.Null,
desc.Key,
desc.DefaultValue,
desc.Extra,
}
}
s.rows = append(s.rows, row)
}
case stmt.ShowWarnings:
// empty result
case stmt.ShowCharset:
// See: http://dev.mysql.com/doc/refman/5.7/en/show-character-set.html
descs := charset.GetAllCharsets()
for _, desc := range descs {
row := &plan.Row{
Data: []interface{}{desc.Name, desc.Desc, desc.DefaultCollation, desc.Maxlen},
}
s.rows = append(s.rows, row)
}
case stmt.ShowVariables:
sessionVars := variable.GetSessionVars(ctx)
for _, v := range variable.SysVars {
if s.Pattern != nil {
s.Pattern.Expr = expression.Value{Val: v.Name}
r, err := s.Pattern.Eval(ctx, nil)
if err != nil {
return errors.Trace(err)
}
match, ok := r.(bool)
if !ok {
return errors.Errorf("Eval like pattern error")
}
if !match {
continue
}
} else if s.Where != nil {
m := map[interface{}]interface{}{}
m[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
if strings.EqualFold(name, "Variable_name") {
return v.Name, nil
}
return nil, errors.Errorf("unknown field %s", name)
}
match, err := expression.EvalBoolExpr(ctx, s.Where, m)
if err != nil {
return errors.Trace(err)
}
if !match {
continue
}
}
value := v.Value
if !s.GlobalScope {
// Try to get Session Scope variable value
sv, ok := sessionVars.Systems[v.Name]
if ok {
value = sv
}
}
row := &plan.Row{Data: []interface{}{v.Name, value}}
s.rows = append(s.rows, row)
}
case stmt.ShowCollation:
collations := charset.GetCollations()
for _, v := range collations {
if s.Pattern != nil {
s.Pattern.Expr = expression.Value{Val: v.Name}
r, err := s.Pattern.Eval(ctx, nil)
if err != nil {
return errors.Trace(err)
}
match, ok := r.(bool)
if !ok {
return errors.Errorf("Eval like pattern error")
}
if !match {
continue
}
} else if s.Where != nil {
m := map[interface{}]interface{}{}
m[expression.ExprEvalIdentFunc] = func(name string) (interface{}, error) {
switch {
case strings.EqualFold(name, "Collation"):
return v.Name, nil
case strings.EqualFold(name, "Charset"):
return v.CharsetName, nil
case strings.EqualFold(name, "Id"):
return v.ID, nil
case strings.EqualFold(name, "Default"):
if v.IsDefault {
return "Yes", nil
}
return "", nil
case strings.EqualFold(name, "Compiled"):
return "Yes", nil
case strings.EqualFold(name, "Sortlen"):
// TODO: add sort length in Collation
return 1, nil
default:
return nil, errors.Errorf("unknown field %s", name)
}
}
match, err := expression.EvalBoolExpr(ctx, s.Where, m)
if err != nil {
return errors.Trace(err)
}
if !match {
continue
}
}
isDefault := ""
if v.IsDefault {
isDefault = "Yes"
}
row := &plan.Row{Data: []interface{}{v.Name, v.CharsetName, v.ID, isDefault, "Yes", 1}}
s.rows = append(s.rows, row)
}
}
return nil
}
func (r *JoinPlan) nextCrossJoin(ctx context.Context) (row *plan.Row, err error) {
visitor := newJoinIdentVisitor(0)
for {
if r.curRow == nil {
r.curRow, err = r.Left.Next(ctx)
if err != nil {
return nil, errors.Trace(err)
}
if r.curRow == nil {
return nil, nil
}
if r.On != nil {
tempExpr := r.On.Clone()
visitor.row = r.curRow.Data
_, err = tempExpr.Accept(visitor)
if err != nil {
return nil, errors.Trace(err)
}
var filtered bool
r.tempPlan, filtered, err = r.Right.Filter(ctx, tempExpr)
if filtered {
log.Debugf("cross join use index")
}
} else {
r.tempPlan = r.Right
}
}
var rightRow *plan.Row
rightRow, err = r.tempPlan.Next(ctx)
if err != nil {
return nil, errors.Trace(err)
}
if rightRow == nil {
r.curRow = nil
r.tempPlan.Close()
continue
}
// To prevent outer modify the slice. See comment above.
joinedRow := make([]interface{}, 0, len(r.curRow.Data)+len(rightRow.Data))
joinedRow = append(append(joinedRow, r.curRow.Data...), rightRow.Data...)
if r.On != nil {
r.evalArgs[expression.ExprEvalIdentReferFunc] = func(name string, scope int, index int) (interface{}, error) {
return joinedRow[index], nil
}
b, err := expression.EvalBoolExpr(ctx, r.On, r.evalArgs)
if err != nil {
return nil, errors.Trace(err)
}
if !b {
// If On condition not satisified, drop this row
continue
}
}
row = &plan.Row{
Data: joinedRow,
RowKeys: append(r.curRow.RowKeys, rightRow.RowKeys...),
}
return
}
}
