// ShowColumns of a table.
// Privileges: None.
// Notes: postgres does not have a SHOW COLUMNS statement.
// mysql only returns columns you have privileges on.
func (p *planner) ShowColumns(n *parser.ShowColumns) (planNode, error) {
desc, err := p.getTableDesc(n.Table)
if err != nil {
return nil, err
}
if desc == nil {
return nil, sqlbase.NewUndefinedTableError(n.Table.String())
}
v := &valuesNode{
columns: []ResultColumn{
{Name: "Field", Typ: parser.TypeString},
{Name: "Type", Typ: parser.TypeString},
{Name: "Null", Typ: parser.TypeBool},
{Name: "Default", Typ: parser.TypeString},
},
}
for i, col := range desc.Columns {
defaultExpr := parser.Datum(parser.DNull)
if e := desc.Columns[i].DefaultExpr; e != nil {
defaultExpr = parser.NewDString(*e)
}
v.rows = append(v.rows, []parser.Datum{
parser.NewDString(desc.Columns[i].Name),
parser.NewDString(col.Type.SQLString()),
parser.MakeDBool(parser.DBool(desc.Columns[i].Nullable)),
defaultExpr,
})
}
return v, nil
}
// ShowColumns of a table.
// Privileges: None.
// Notes: postgres does not have a SHOW COLUMNS statement.
// mysql only returns columns you have privileges on.
func (p *planner) ShowColumns(n *parser.ShowColumns) (planNode, *roachpb.Error) {
desc, pErr := p.getTableDesc(n.Table)
if pErr != nil {
return nil, pErr
}
v := &valuesNode{
columns: []column{
{name: "Field", typ: parser.DummyString},
{name: "Type", typ: parser.DummyString},
{name: "Null", typ: parser.DummyBool},
{name: "Default", typ: parser.DummyString},
},
}
for i, col := range desc.Columns {
defaultExpr := parser.Datum(parser.DNull)
if e := desc.Columns[i].DefaultExpr; e != nil {
defaultExpr = parser.DString(*e)
}
v.rows = append(v.rows, []parser.Datum{
parser.DString(desc.Columns[i].Name),
parser.DString(col.Type.SQLString()),
parser.DBool(desc.Columns[i].Nullable),
defaultExpr,
})
}
return v, nil
}
// ShowColumns of a table.
// Privileges: None.
// Notes: postgres does not have a SHOW COLUMNS statement.
// mysql only returns columns you have privileges on.
func (p *planner) ShowColumns(n *parser.ShowColumns) (planNode, error) {
desc, err := p.getTableDesc(n.Table)
if err != nil {
return nil, err
}
v := &valuesNode{columns: []string{"Field", "Type", "Null", "Default"}}
for i, col := range desc.Columns {
defaultExpr := parser.Datum(parser.DNull)
if e := desc.Columns[i].DefaultExpr; e != nil {
defaultExpr = parser.DString(*e)
}
v.rows = append(v.rows, []parser.Datum{
parser.DString(desc.Columns[i].Name),
parser.DString(col.Type.SQLString()),
parser.DBool(desc.Columns[i].Nullable),
defaultExpr,
})
}
return v, nil
}
