func (p *planner) fillDefaults(
defaultExprs []parser.TypedExpr, cols []sqlbase.ColumnDescriptor, n *parser.Insert,
) (parser.SelectStatement, error) {
if n.DefaultValues() {
row := make(parser.Exprs, 0, len(cols))
for i := range cols {
if defaultExprs == nil {
row = append(row, parser.DNull)
continue
}
row = append(row, defaultExprs[i])
}
return &parser.ValuesClause{Tuples: []*parser.Tuple{{Exprs: row}}}, nil
}
values, ok := n.Rows.Select.(*parser.ValuesClause)
if !ok {
return n.Rows.Select, nil
}
ret := values
for tIdx, tuple := range values.Tuples {
tupleCopied := false
for eIdx, val := range tuple.Exprs {
switch val.(type) {
case parser.DefaultVal:
if !tupleCopied {
if ret == values {
ret = &parser.ValuesClause{Tuples: append([]*parser.Tuple(nil), values.Tuples...)}
}
ret.Tuples[tIdx] =
&parser.Tuple{Exprs: append([]parser.Expr(nil), tuple.Exprs...)}
tupleCopied = true
}
if defaultExprs == nil || eIdx >= len(defaultExprs) {
// The case where eIdx is too large for defaultExprs will be
// transformed into an error by the check on the number of
// columns in Insert().
ret.Tuples[tIdx].Exprs[eIdx] = parser.DNull
} else {
ret.Tuples[tIdx].Exprs[eIdx] = defaultExprs[eIdx]
}
}
}
}
return ret, nil
}
// Insert inserts rows into the database.
// Privileges: INSERT on table. Also requires UPDATE on "ON DUPLICATE KEY UPDATE".
// Notes: postgres requires INSERT. No "on duplicate key update" option.
// mysql requires INSERT. Also requires UPDATE on "ON DUPLICATE KEY UPDATE".
func (p *planner) Insert(
n *parser.Insert, desiredTypes []parser.Type, autoCommit bool,
) (planNode, error) {
tn, err := p.getAliasedTableName(n.Table)
if err != nil {
return nil, err
}
en, err := p.makeEditNode(tn, autoCommit, privilege.INSERT)
if err != nil {
return nil, err
}
if n.OnConflict != nil {
if !n.OnConflict.DoNothing {
if err := p.checkPrivilege(en.tableDesc, privilege.UPDATE); err != nil {
return nil, err
}
}
// TODO(dan): Support RETURNING in UPSERTs.
if n.Returning != nil {
return nil, fmt.Errorf("RETURNING is not supported with UPSERT")
}
}
var cols []sqlbase.ColumnDescriptor
// Determine which columns we're inserting into.
if n.DefaultValues() {
cols = en.tableDesc.Columns
} else {
var err error
if cols, err = p.processColumns(en.tableDesc, n.Columns); err != nil {
return nil, err
}
}
// Number of columns expecting an input. This doesn't include the
// columns receiving a default value.
numInputColumns := len(cols)
colIDSet := make(map[sqlbase.ColumnID]struct{}, len(cols))
for _, col := range cols {
colIDSet[col.ID] = struct{}{}
}
// Add the column if it has a DEFAULT expression.
addIfDefault := func(col sqlbase.ColumnDescriptor) {
if col.DefaultExpr != nil {
if _, ok := colIDSet[col.ID]; !ok {
colIDSet[col.ID] = struct{}{}
cols = append(cols, col)
}
}
}
// Add any column that has a DEFAULT expression.
for _, col := range en.tableDesc.Columns {
addIfDefault(col)
}
// Also add any column in a mutation that is WRITE_ONLY and has
// a DEFAULT expression.
for _, m := range en.tableDesc.Mutations {
if m.State != sqlbase.DescriptorMutation_WRITE_ONLY {
continue
}
if col := m.GetColumn(); col != nil {
addIfDefault(*col)
}
}
defaultExprs, err := makeDefaultExprs(cols, &p.parser, &p.evalCtx)
if err != nil {
return nil, err
}
// Replace any DEFAULT markers with the corresponding default expressions.
insertRows, err := p.fillDefaults(defaultExprs, cols, n)
if err != nil {
return nil, err
}
// Analyze the expressions for column information and typing.
desiredTypesFromSelect := make([]parser.Type, len(cols))
for i, col := range cols {
desiredTypesFromSelect[i] = col.Type.ToDatumType()
}
// Create the plan for the data source.
// This performs type checking on source expressions, collecting
// types for placeholders in the process.
rows, err := p.newPlan(insertRows, desiredTypesFromSelect, false)
if err != nil {
return nil, err
}
if expressions := len(rows.Columns()); expressions > numInputColumns {
return nil, fmt.Errorf("INSERT error: table %s has %d columns but %d values were supplied", n.Table, numInputColumns, expressions)
}
fkTables := tablesNeededForFKs(*en.tableDesc, CheckInserts)
if err := p.fillFKTableMap(fkTables); err != nil {
return nil, err
}
ri, err := makeRowInserter(p.txn, en.tableDesc, fkTables, cols, checkFKs)
if err != nil {
return nil, err
}
var tw tableWriter
if n.OnConflict == nil {
tw = &tableInserter{ri: ri, autoCommit: autoCommit}
} else {
updateExprs, conflictIndex, err := upsertExprsAndIndex(en.tableDesc, *n.OnConflict, ri.insertCols)
if err != nil {
return nil, err
}
if n.OnConflict.DoNothing {
// TODO(dan): Postgres allows ON CONFLICT DO NOTHING without specifying a
// conflict index, which means do nothing on any conflict. Support this if
// someone needs it.
tw = &tableUpserter{ri: ri, conflictIndex: *conflictIndex}
} else {
names, err := p.namesForExprs(updateExprs)
if err != nil {
return nil, err
}
// Also include columns that are inactive because they should be
// updated.
updateCols := make([]sqlbase.ColumnDescriptor, len(names))
for i, n := range names {
c, err := n.NormalizeUnqualifiedColumnItem()
if err != nil {
return nil, err
}
status, idx, err := en.tableDesc.FindColumnByName(c.ColumnName)
if err != nil {
return nil, err
}
if status == sqlbase.DescriptorActive {
updateCols[i] = en.tableDesc.Columns[idx]
} else {
updateCols[i] = *en.tableDesc.Mutations[idx].GetColumn()
}
}
helper, err := p.makeUpsertHelper(tn, en.tableDesc, ri.insertCols, updateCols, updateExprs, conflictIndex)
if err != nil {
return nil, err
}
fkTables := tablesNeededForFKs(*en.tableDesc, CheckUpdates)
if err := p.fillFKTableMap(fkTables); err != nil {
return nil, err
}
tw = &tableUpserter{ri: ri, fkTables: fkTables, updateCols: updateCols, conflictIndex: *conflictIndex, evaler: helper}
}
}
in := &insertNode{
n: n,
editNodeBase: en,
defaultExprs: defaultExprs,
insertCols: ri.insertCols,
insertColIDtoRowIndex: ri.insertColIDtoRowIndex,
tw: tw,
}
if err := in.checkHelper.init(p, tn, en.tableDesc); err != nil {
return nil, err
}
if err := in.run.initEditNode(&in.editNodeBase, rows, n.Returning, desiredTypes); err != nil {
return nil, err
}
return in, nil
}