func (c *checkHelper) init(
p *planner, tn *parser.TableName, tableDesc *sqlbase.TableDescriptor,
) error {
if len(tableDesc.Checks) == 0 {
return nil
}
c.cols = tableDesc.Columns
c.sourceInfo = newSourceInfoForSingleTable(*tn, makeResultColumns(tableDesc.Columns))
c.exprs = make([]parser.TypedExpr, len(tableDesc.Checks))
exprStrings := make([]string, len(tableDesc.Checks))
for i, check := range tableDesc.Checks {
exprStrings[i] = check.Expr
}
exprs, err := parser.ParseExprsTraditional(exprStrings)
if err != nil {
return err
}
ivarHelper := parser.MakeIndexedVarHelper(c, len(c.cols))
for i, raw := range exprs {
typedExpr, err := p.analyzeExpr(raw, multiSourceInfo{c.sourceInfo}, ivarHelper,
parser.TypeBool, false, "")
if err != nil {
return err
}
c.exprs[i] = typedExpr
}
c.ivars = ivarHelper.GetIndexedVars()
c.curSourceRow = make(parser.DTuple, len(c.cols))
return nil
}
func makeDefaultExprs(
cols []sqlbase.ColumnDescriptor, parse *parser.Parser, evalCtx *parser.EvalContext,
) ([]parser.TypedExpr, error) {
// Check to see if any of the columns have DEFAULT expressions. If there
// are no DEFAULT expressions, we don't bother with constructing the
// defaults map as the defaults are all NULL.
haveDefaults := false
for _, col := range cols {
if col.DefaultExpr != nil {
haveDefaults = true
break
}
}
if !haveDefaults {
return nil, nil
}
// Build the default expressions map from the parsed SELECT statement.
defaultExprs := make([]parser.TypedExpr, 0, len(cols))
exprStrings := make([]string, 0, len(cols))
for _, col := range cols {
if col.DefaultExpr != nil {
exprStrings = append(exprStrings, *col.DefaultExpr)
}
}
exprs, err := parser.ParseExprsTraditional(exprStrings)
if err != nil {
return nil, err
}
defExprIdx := 0
for _, col := range cols {
if col.DefaultExpr == nil {
defaultExprs = append(defaultExprs, parser.DNull)
continue
}
expr := exprs[defExprIdx]
typedExpr, err := parser.TypeCheck(expr, nil, col.Type.ToDatumType())
if err != nil {
return nil, err
}
if typedExpr, err = parse.NormalizeExpr(evalCtx, typedExpr); err != nil {
return nil, err
}
defaultExprs = append(defaultExprs, typedExpr)
defExprIdx++
}
return defaultExprs, nil
}
// RenameColumn renames the column.
// Privileges: CREATE on table.
// notes: postgres requires CREATE on the table.
// mysql requires ALTER, CREATE, INSERT on the table.
func (p *planner) RenameColumn(n *parser.RenameColumn) (planNode, error) {
// Check if table exists.
tn, err := n.Table.NormalizeWithDatabaseName(p.session.Database)
if err != nil {
return nil, err
}
tableDesc, err := p.getTableDesc(tn)
if err != nil {
return nil, err
}
if tableDesc == nil {
if n.IfExists {
// Noop.
return &emptyNode{}, nil
}
// Key does not exist, but we want it to: error out.
return nil, fmt.Errorf("table %q does not exist", tn.Table())
}
if err := p.checkPrivilege(tableDesc, privilege.CREATE); err != nil {
return nil, err
}
if n.NewName == "" {
return nil, errEmptyColumnName
}
normNewColName := n.NewName.Normalize()
normColName := n.Name.Normalize()
status, i, err := tableDesc.FindColumnByNormalizedName(normColName)
// n.IfExists only applies to table, no need to check here.
if err != nil {
return nil, err
}
var column *sqlbase.ColumnDescriptor
if status == sqlbase.DescriptorActive {
column = &tableDesc.Columns[i]
} else {
column = tableDesc.Mutations[i].GetColumn()
}
for _, tableRef := range tableDesc.DependedOnBy {
found := false
for _, colID := range tableRef.ColumnIDs {
if colID == column.ID {
found = true
}
}
if found {
return nil, p.dependentViewRenameError(
"column", n.Name.String(), tableDesc.ParentID, tableRef.ID)
}
}
if normColName == normNewColName {
// Noop.
return &emptyNode{}, nil
}
if _, _, err := tableDesc.FindColumnByNormalizedName(normNewColName); err == nil {
return nil, fmt.Errorf("column name %q already exists", n.NewName)
}
preFn := func(expr parser.Expr) (err error, recurse bool, newExpr parser.Expr) {
if vBase, ok := expr.(parser.VarName); ok {
v, err := vBase.NormalizeVarName()
if err != nil {
return err, false, nil
}
if c, ok := v.(*parser.ColumnItem); ok {
if c.ColumnName.Normalize() == normColName {
c.ColumnName = n.NewName
}
}
return nil, false, v
}
return nil, true, expr
}
exprStrings := make([]string, len(tableDesc.Checks))
for i, check := range tableDesc.Checks {
exprStrings[i] = check.Expr
}
exprs, err := parser.ParseExprsTraditional(exprStrings)
if err != nil {
return nil, err
}
for i := range tableDesc.Checks {
expr, err := parser.SimpleVisit(exprs[i], preFn)
if err != nil {
return nil, err
}
if after := expr.String(); after != tableDesc.Checks[i].Expr {
tableDesc.Checks[i].Expr = after
}
}
// Rename the column in the indexes.
tableDesc.RenameColumnNormalized(column.ID, normNewColName)
column.Name = normNewColName
if err := tableDesc.SetUpVersion(); err != nil {
return nil, err
}
descKey := sqlbase.MakeDescMetadataKey(tableDesc.GetID())
if err := tableDesc.Validate(p.txn); err != nil {
return nil, err
}
if err := p.txn.Put(descKey, sqlbase.WrapDescriptor(tableDesc)); err != nil {
return nil, err
}
p.notifySchemaChange(tableDesc.ID, sqlbase.InvalidMutationID)
return &emptyNode{}, nil
}
