func analyzeSelectExprs(exprs sqlparser.SelectExprs, table *schema.Table) (selects []int, err error) {
selects = make([]int, 0, len(exprs))
for _, expr := range exprs {
switch expr := expr.(type) {
case *sqlparser.StarExpr:
// Append all columns.
for colIndex := range table.Columns {
selects = append(selects, colIndex)
}
case *sqlparser.NonStarExpr:
name := sqlparser.GetColName(expr.Expr)
if name == "" {
// Not a simple column name.
return nil, nil
}
colIndex := table.FindColumn(name)
if colIndex == -1 {
return nil, fmt.Errorf("column %s not found in table %s", name, table.Name)
}
selects = append(selects, colIndex)
default:
panic("unreachable")
}
}
return selects, nil
}
func getInsertPKColumns(columns sqlparser.Columns, tableInfo *schema.Table) (pkColumnNumbers []int) {
if len(columns) == 0 {
return tableInfo.PKColumns
}
pkIndex := tableInfo.Indexes[0]
pkColumnNumbers = make([]int, len(pkIndex.Columns))
for i := range pkColumnNumbers {
pkColumnNumbers[i] = -1
}
for i, column := range columns {
index := pkIndex.FindColumn(sqlparser.GetColName(column.(*sqlparser.NonStarExpr).Expr))
if index == -1 {
continue
}
pkColumnNumbers[index] = i
}
return pkColumnNumbers
}
func analyzeUpdateExpressions(exprs sqlparser.UpdateExprs, pkIndex *schema.Index) (pkValues []interface{}, err error) {
for _, expr := range exprs {
index := pkIndex.FindColumn(sqlparser.GetColName(expr.Name))
if index == -1 {
continue
}
if !sqlparser.IsValue(expr.Expr) {
log.Warningf("expression is too complex %v", expr)
return nil, TooComplex
}
if pkValues == nil {
pkValues = make([]interface{}, len(pkIndex.Columns))
}
var err error
pkValues[index], err = sqlparser.AsInterface(expr.Expr)
if err != nil {
return nil, err
}
}
return pkValues, nil
}
func buildIndexPlan(ins *sqlparser.Insert, tablename string, colVindex *ColVindex, plan *Plan) error {
pos := -1
for i, column := range ins.Columns {
if colVindex.Col == sqlparser.GetColName(column.(*sqlparser.NonStarExpr).Expr) {
pos = i
break
}
}
if pos == -1 {
pos = len(ins.Columns)
ins.Columns = append(ins.Columns, &sqlparser.NonStarExpr{Expr: &sqlparser.ColName{Name: []byte(colVindex.Col)}})
ins.Rows.(sqlparser.Values)[0] = append(ins.Rows.(sqlparser.Values)[0].(sqlparser.ValTuple), &sqlparser.NullVal{})
}
row := ins.Rows.(sqlparser.Values)[0].(sqlparser.ValTuple)
val, err := asInterface(row[pos])
if err != nil {
return fmt.Errorf("could not convert val: %s, pos: %d", row[pos], pos)
}
plan.Values = append(plan.Values.([]interface{}), val)
row[pos] = sqlparser.ValArg([]byte(fmt.Sprintf(":_%s", colVindex.Col)))
return nil
}