Golang parser.DBool函数代码示例

// golangFillQueryArguments populates the placeholder map with
// types and values from an array of Go values.
// TODO: This does not support arguments of the SQL 'Date' type, as there is not
// an equivalent type in Go's standard library. It's not currently needed by any
// of our internal tables.
func golangFillQueryArguments(pinfo *parser.PlaceholderInfo, args []interface{}) {
	pinfo.Clear()

	for i, arg := range args {
		k := fmt.Sprint(i + 1)
		if arg == nil {
			pinfo.SetValue(k, parser.DNull)
			continue
		}

		// A type switch to handle a few explicit types with special semantics:
		// - Datums are passed along as is.
		// - Time datatypes get special representation in the database.
		var d parser.Datum
		switch t := arg.(type) {
		case parser.Datum:
			d = t
		case time.Time:
			d = parser.MakeDTimestamp(t, time.Microsecond)
		case time.Duration:
			d = &parser.DInterval{Duration: duration.Duration{Nanos: t.Nanoseconds()}}
		case *inf.Dec:
			dd := &parser.DDecimal{}
			dd.Set(t)
			d = dd
		}
		if d == nil {
			// Handle all types which have an underlying type that can be stored in the
			// database.
			// Note: if this reflection becomes a performance concern in the future,
			// commonly used types could be added explicitly into the type switch above
			// for a performance gain.
			val := reflect.ValueOf(arg)
			switch val.Kind() {
			case reflect.Bool:
				d = parser.MakeDBool(parser.DBool(val.Bool()))
			case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
				d = parser.NewDInt(parser.DInt(val.Int()))
			case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
				d = parser.NewDInt(parser.DInt(val.Uint()))
			case reflect.Float32, reflect.Float64:
				d = parser.NewDFloat(parser.DFloat(val.Float()))
			case reflect.String:
				d = parser.NewDString(val.String())
			case reflect.Slice:
				// Handle byte slices.
				if val.Type().Elem().Kind() == reflect.Uint8 {
					d = parser.NewDBytes(parser.DBytes(val.Bytes()))
				}
			}
			if d == nil {
				panic(fmt.Sprintf("unexpected type %T", arg))
			}
		}
		pinfo.SetValue(k, d)
	}
}

// DecodeTableValue decodes a value encoded by EncodeTableValue.
func DecodeTableValue(a *DatumAlloc, valType parser.Type, b []byte) (parser.Datum, []byte, error) {
	_, dataOffset, _, typ, err := encoding.DecodeValueTag(b)
	if err != nil {
		return nil, b, err
	}
	if typ == encoding.Null {
		return parser.DNull, b[dataOffset:], nil
	}
	switch valType {
	case parser.TypeBool:
		var x bool
		b, x, err = encoding.DecodeBoolValue(b)
		// No need to chunk allocate DBool as MakeDBool returns either
		// parser.DBoolTrue or parser.DBoolFalse.
		return parser.MakeDBool(parser.DBool(x)), b, err
	case parser.TypeInt:
		var i int64
		b, i, err = encoding.DecodeIntValue(b)
		return a.NewDInt(parser.DInt(i)), b, err
	case parser.TypeFloat:
		var f float64
		b, f, err = encoding.DecodeFloatValue(b)
		return a.NewDFloat(parser.DFloat(f)), b, err
	case parser.TypeDecimal:
		var d *inf.Dec
		b, d, err = encoding.DecodeDecimalValue(b)
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(d)
		return dd, b, err
	case parser.TypeString:
		var data []byte
		b, data, err = encoding.DecodeBytesValue(b)
		return a.NewDString(parser.DString(data)), b, err
	case parser.TypeBytes:
		var data []byte
		b, data, err = encoding.DecodeBytesValue(b)
		return a.NewDBytes(parser.DBytes(data)), b, err
	case parser.TypeDate:
		var i int64
		b, i, err = encoding.DecodeIntValue(b)
		return a.NewDDate(parser.DDate(i)), b, err
	case parser.TypeTimestamp:
		var t time.Time
		b, t, err = encoding.DecodeTimeValue(b)
		return a.NewDTimestamp(parser.DTimestamp{Time: t}), b, err
	case parser.TypeTimestampTZ:
		var t time.Time
		b, t, err = encoding.DecodeTimeValue(b)
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: t}), b, err
	case parser.TypeInterval:
		var d duration.Duration
		b, d, err = encoding.DecodeDurationValue(b)
		return a.NewDInterval(parser.DInterval{Duration: d}), b, err
	default:
		return nil, nil, errors.Errorf("TODO(pmattis): decoded index value: %s", valType)
	}
}

// ShowColumns of a table.
// Privileges: Any privilege on table.
//   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) {
	tn, err := n.Table.NormalizeWithDatabaseName(p.session.Database)
	if err != nil {
		return nil, err
	}

	desc, err := p.mustGetTableDesc(tn)
	if err != nil {
		return nil, err
	}
	if err := p.anyPrivilege(desc); err != nil {
		return nil, err
	}

	columns := ResultColumns{
		{Name: "Field", Typ: parser.TypeString},
		{Name: "Type", Typ: parser.TypeString},
		{Name: "Null", Typ: parser.TypeBool},
		{Name: "Default", Typ: parser.TypeString},
	}
	return &delayedNode{
		p:       p,
		name:    "SHOW COLUMNS FROM " + tn.String(),
		columns: columns,
		constructor: func(p *planner) (planNode, error) {
			v := p.newContainerValuesNode(columns, 0)

			for i, col := range desc.Columns {
				defaultExpr := parser.DNull
				if e := desc.Columns[i].DefaultExpr; e != nil {
					defaultExpr = parser.NewDString(*e)
				}
				newRow := parser.DTuple{
					parser.NewDString(desc.Columns[i].Name),
					parser.NewDString(col.Type.SQLString()),
					parser.MakeDBool(parser.DBool(desc.Columns[i].Nullable)),
					defaultExpr,
				}
				if err := v.rows.AddRow(newRow); err != nil {
					v.rows.Close()
					return nil, err
				}
			}
			return v, nil
		},
	}, nil
}

// MakePrimaryIndexKey creates a key prefix that corresponds to a table row
// (in the primary index); it is intended for tests.
//
// The value types must match the primary key columns (or a prefix of them);
// supported types are: - Datum
//  - bool (converts to DBool)
//  - int (converts to DInt)
//  - string (converts to DString)
func MakePrimaryIndexKey(desc *TableDescriptor, vals ...interface{}) (roachpb.Key, error) {
	index := &desc.PrimaryIndex
	if len(vals) > len(index.ColumnIDs) {
		return nil, errors.Errorf("got %d values, PK has %d columns", len(vals), len(index.ColumnIDs))
	}
	datums := make([]parser.Datum, len(vals))
	for i, v := range vals {
		switch v := v.(type) {
		case bool:
			datums[i] = parser.MakeDBool(parser.DBool(v))
		case int:
			datums[i] = parser.NewDInt(parser.DInt(v))
		case string:
			datums[i] = parser.NewDString(v)
		case parser.Datum:
			datums[i] = v
		default:
			return nil, errors.Errorf("unexpected value type %T", v)
		}
		// Check that the value type matches.
		colID := index.ColumnIDs[i]
		for _, c := range desc.Columns {
			if c.ID == colID {
				if t := DatumTypeToColumnKind(datums[i].ResolvedType()); t != c.Type.Kind {
					return nil, errors.Errorf("column %d of type %s, got value of type %s", i, c.Type.Kind, t)
				}
				break
			}
		}
	}
	// Create the ColumnID to index in datums slice map needed by
	// MakeIndexKeyPrefix.
	colIDToRowIndex := make(map[ColumnID]int)
	for i := range vals {
		colIDToRowIndex[index.ColumnIDs[i]] = i
	}

	keyPrefix := MakeIndexKeyPrefix(desc, index.ID)
	key, _, err := EncodeIndexKey(desc, index, colIDToRowIndex, datums, keyPrefix)
	if err != nil {
		return nil, err
	}
	return roachpb.Key(key), nil
}

// ShowIndex returns all the indexes for a table.
// Privileges: Any privilege on table.
//   Notes: postgres does not have a SHOW INDEXES statement.
//          mysql requires some privilege for any column.
func (p *planner) ShowIndex(n *parser.ShowIndex) (planNode, error) {
	tn, err := n.Table.NormalizeWithDatabaseName(p.session.Database)
	if err != nil {
		return nil, err
	}

	desc, err := p.mustGetTableDesc(tn)
	if err != nil {
		return nil, err
	}
	if err := p.anyPrivilege(desc); err != nil {
		return nil, err
	}

	columns := ResultColumns{
		{Name: "Table", Typ: parser.TypeString},
		{Name: "Name", Typ: parser.TypeString},
		{Name: "Unique", Typ: parser.TypeBool},
		{Name: "Seq", Typ: parser.TypeInt},
		{Name: "Column", Typ: parser.TypeString},
		{Name: "Direction", Typ: parser.TypeString},
		{Name: "Storing", Typ: parser.TypeBool},
	}

	return &delayedNode{
		p:       p,
		name:    "SHOW INDEX FROM " + tn.String(),
		columns: columns,
		constructor: func(p *planner) (planNode, error) {
			v := p.newContainerValuesNode(columns, 0)

			appendRow := func(index sqlbase.IndexDescriptor, colName string, sequence int,
				direction string, isStored bool) error {
				newRow := parser.DTuple{
					parser.NewDString(tn.Table()),
					parser.NewDString(index.Name),
					parser.MakeDBool(parser.DBool(index.Unique)),
					parser.NewDInt(parser.DInt(sequence)),
					parser.NewDString(colName),
					parser.NewDString(direction),
					parser.MakeDBool(parser.DBool(isStored)),
				}
				_, err := v.rows.AddRow(newRow)
				return err
			}

			for _, index := range append([]sqlbase.IndexDescriptor{desc.PrimaryIndex}, desc.Indexes...) {
				sequence := 1
				for i, col := range index.ColumnNames {
					if err := appendRow(index, col, sequence, index.ColumnDirections[i].String(), false); err != nil {
						v.rows.Close()
						return nil, err
					}
					sequence++
				}
				for _, col := range index.StoreColumnNames {
					if err := appendRow(index, col, sequence, "N/A", true); err != nil {
						v.rows.Close()
						return nil, err
					}
					sequence++
				}
			}
			return v, nil
		},
	}, nil
}

//.........这里部分代码省略.........

	// pk holds the last values of the fetched primary keys
	var pk []driver.Value
	q := fmt.Sprintf(bs, "")
	for {
		rows, err := conn.Query(q, pk)
		if err != nil {
			return err
		}
		cols := rows.Columns()
		pkcols := cols[:len(index)]
		cols = cols[len(index):]
		inserts := make([][]string, 0, limit)
		i := 0
		for i < limit {
			vals := make([]driver.Value, len(cols)+len(pkcols))
			if err := rows.Next(vals); err == io.EOF {
				break
			} else if err != nil {
				return err
			}
			if pk == nil {
				q = fmt.Sprintf(bs, wbuf.String())
			}
			pk = vals[:len(index)]
			vals = vals[len(index):]
			ivals := make([]string, len(vals))
			// Values need to be correctly encoded for INSERT statements in a text file.
			for si, sv := range vals {
				switch t := sv.(type) {
				case nil:
					ivals[si] = "NULL"
				case bool:
					ivals[si] = parser.MakeDBool(parser.DBool(t)).String()
				case int64:
					ivals[si] = parser.NewDInt(parser.DInt(t)).String()
				case float64:
					ivals[si] = parser.NewDFloat(parser.DFloat(t)).String()
				case string:
					ivals[si] = parser.NewDString(t).String()
				case []byte:
					switch ct := coltypes[cols[si]]; ct {
					case "INTERVAL":
						ivals[si] = fmt.Sprintf("'%s'", t)
					case "BYTES":
						ivals[si] = parser.NewDBytes(parser.DBytes(t)).String()
					default:
						// STRING and DECIMAL types can have optional length
						// suffixes, so only examine the prefix of the type.
						if strings.HasPrefix(coltypes[cols[si]], "STRING") {
							ivals[si] = parser.NewDString(string(t)).String()
						} else if strings.HasPrefix(coltypes[cols[si]], "DECIMAL") {
							ivals[si] = string(t)
						} else {
							panic(errors.Errorf("unknown []byte type: %s, %v: %s", t, cols[si], coltypes[cols[si]]))
						}
					}
				case time.Time:
					var d parser.Datum
					ct := coltypes[cols[si]]
					switch ct {
					case "DATE":
						d = parser.NewDDateFromTime(t, time.UTC)
					case "TIMESTAMP":
						d = parser.MakeDTimestamp(t, time.Nanosecond)
					case "TIMESTAMP WITH TIME ZONE":

// DecodeTableKey decodes a table key/value.
func DecodeTableKey(
	a *DatumAlloc, valType parser.Type, key []byte, dir encoding.Direction,
) (parser.Datum, []byte, error) {
	if (dir != encoding.Ascending) && (dir != encoding.Descending) {
		return nil, nil, errors.Errorf("invalid direction: %d", dir)
	}
	var isNull bool
	if key, isNull = encoding.DecodeIfNull(key); isNull {
		return parser.DNull, key, nil
	}
	var rkey []byte
	var err error
	switch valType {
	case parser.TypeBool:
		var i int64
		if dir == encoding.Ascending {
			rkey, i, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, i, err = encoding.DecodeVarintDescending(key)
		}
		// No need to chunk allocate DBool as MakeDBool returns either
		// parser.DBoolTrue or parser.DBoolFalse.
		return parser.MakeDBool(parser.DBool(i != 0)), rkey, err
	case parser.TypeInt:
		var i int64
		if dir == encoding.Ascending {
			rkey, i, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, i, err = encoding.DecodeVarintDescending(key)
		}
		return a.NewDInt(parser.DInt(i)), rkey, err
	case parser.TypeFloat:
		var f float64
		if dir == encoding.Ascending {
			rkey, f, err = encoding.DecodeFloatAscending(key)
		} else {
			rkey, f, err = encoding.DecodeFloatDescending(key)
		}
		return a.NewDFloat(parser.DFloat(f)), rkey, err
	case parser.TypeDecimal:
		var d *inf.Dec
		if dir == encoding.Ascending {
			rkey, d, err = encoding.DecodeDecimalAscending(key, nil)
		} else {
			rkey, d, err = encoding.DecodeDecimalDescending(key, nil)
		}
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(d)
		return dd, rkey, err
	case parser.TypeString:
		var r string
		if dir == encoding.Ascending {
			rkey, r, err = encoding.DecodeUnsafeStringAscending(key, nil)
		} else {
			rkey, r, err = encoding.DecodeUnsafeStringDescending(key, nil)
		}
		return a.NewDString(parser.DString(r)), rkey, err
	case parser.TypeBytes:
		var r []byte
		if dir == encoding.Ascending {
			rkey, r, err = encoding.DecodeBytesAscending(key, nil)
		} else {
			rkey, r, err = encoding.DecodeBytesDescending(key, nil)
		}
		return a.NewDBytes(parser.DBytes(r)), rkey, err
	case parser.TypeDate:
		var t int64
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeVarintAscending(key)
		} else {
			rkey, t, err = encoding.DecodeVarintDescending(key)
		}
		return a.NewDDate(parser.DDate(t)), rkey, err
	case parser.TypeTimestamp:
		var t time.Time
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeTimeAscending(key)
		} else {
			rkey, t, err = encoding.DecodeTimeDescending(key)
		}
		return a.NewDTimestamp(parser.DTimestamp{Time: t}), rkey, err
	case parser.TypeTimestampTZ:
		var t time.Time
		if dir == encoding.Ascending {
			rkey, t, err = encoding.DecodeTimeAscending(key)
		} else {
			rkey, t, err = encoding.DecodeTimeDescending(key)
		}
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: t}), rkey, err
	case parser.TypeInterval:
		var d duration.Duration
		if dir == encoding.Ascending {
			rkey, d, err = encoding.DecodeDurationAscending(key)
		} else {
			rkey, d, err = encoding.DecodeDurationDescending(key)
		}
		return a.NewDInterval(parser.DInterval{Duration: d}), rkey, err
	default:
		return nil, nil, errors.Errorf("TODO(pmattis): decoded index key: %s", valType)
//.........这里部分代码省略.........

// UnmarshalColumnValue decodes the value from a key-value pair using the type
// expected by the column. An error is returned if the value's type does not
// match the column's type.
func UnmarshalColumnValue(
	a *DatumAlloc, kind ColumnType_Kind, value *roachpb.Value,
) (parser.Datum, error) {
	if value == nil {
		return parser.DNull, nil
	}

	switch kind {
	case ColumnType_BOOL:
		v, err := value.GetBool()
		if err != nil {
			return nil, err
		}
		return parser.MakeDBool(parser.DBool(v)), nil
	case ColumnType_INT:
		v, err := value.GetInt()
		if err != nil {
			return nil, err
		}
		return a.NewDInt(parser.DInt(v)), nil
	case ColumnType_FLOAT:
		v, err := value.GetFloat()
		if err != nil {
			return nil, err
		}
		return a.NewDFloat(parser.DFloat(v)), nil
	case ColumnType_DECIMAL:
		v, err := value.GetDecimal()
		if err != nil {
			return nil, err
		}
		dd := a.NewDDecimal(parser.DDecimal{})
		dd.Set(v)
		return dd, nil
	case ColumnType_STRING:
		v, err := value.GetBytes()
		if err != nil {
			return nil, err
		}
		return a.NewDString(parser.DString(v)), nil
	case ColumnType_BYTES:
		v, err := value.GetBytes()
		if err != nil {
			return nil, err
		}
		return a.NewDBytes(parser.DBytes(v)), nil
	case ColumnType_DATE:
		v, err := value.GetInt()
		if err != nil {
			return nil, err
		}
		return a.NewDDate(parser.DDate(v)), nil
	case ColumnType_TIMESTAMP:
		v, err := value.GetTime()
		if err != nil {
			return nil, err
		}
		return a.NewDTimestamp(parser.DTimestamp{Time: v}), nil
	case ColumnType_TIMESTAMPTZ:
		v, err := value.GetTime()
		if err != nil {
			return nil, err
		}
		return a.NewDTimestampTZ(parser.DTimestampTZ{Time: v}), nil
	case ColumnType_INTERVAL:
		d, err := value.GetDuration()
		if err != nil {
			return nil, err
		}
		return a.NewDInterval(parser.DInterval{Duration: d}), nil
	default:
		return nil, errors.Errorf("unsupported column type: %s", kind)
	}
}

// decodeOidDatum decodes bytes with specified Oid and format code into
// a datum.
func decodeOidDatum(id oid.Oid, code formatCode, b []byte) (parser.Datum, error) {
	var d parser.Datum
	switch id {
	case oid.T_bool:
		switch code {
		case formatText:
			v, err := strconv.ParseBool(string(b))
			if err != nil {
				return d, err
			}
			d = parser.MakeDBool(parser.DBool(v))
		case formatBinary:
			switch b[0] {
			case 0:
				d = parser.MakeDBool(false)
			case 1:
				d = parser.MakeDBool(true)
			default:
				return d, errors.Errorf("unsupported binary bool: %q", b)
			}
		default:
			return d, errors.Errorf("unsupported bool format code: %d", code)
		}
	case oid.T_int2:
		switch code {
		case formatText:
			i, err := strconv.ParseInt(string(b), 10, 64)
			if err != nil {
				return d, err
			}
			d = parser.NewDInt(parser.DInt(i))
		case formatBinary:
			if len(b) < 2 {
				return d, errors.Errorf("int2 requires 2 bytes for binary format")
			}
			i := int16(binary.BigEndian.Uint16(b))
			d = parser.NewDInt(parser.DInt(i))
		default:
			return d, errors.Errorf("unsupported int2 format code: %d", code)
		}
	case oid.T_int4:
		switch code {
		case formatText:
			i, err := strconv.ParseInt(string(b), 10, 64)
			if err != nil {
				return d, err
			}
			d = parser.NewDInt(parser.DInt(i))
		case formatBinary:
			if len(b) < 4 {
				return d, errors.Errorf("int4 requires 4 bytes for binary format")
			}
			i := int32(binary.BigEndian.Uint32(b))
			d = parser.NewDInt(parser.DInt(i))
		default:
			return d, errors.Errorf("unsupported int4 format code: %d", code)
		}
	case oid.T_int8:
		switch code {
		case formatText:
			i, err := strconv.ParseInt(string(b), 10, 64)
			if err != nil {
				return d, err
			}
			d = parser.NewDInt(parser.DInt(i))
		case formatBinary:
			if len(b) < 8 {
				return d, errors.Errorf("int8 requires 8 bytes for binary format")
			}
			i := int64(binary.BigEndian.Uint64(b))
			d = parser.NewDInt(parser.DInt(i))
		default:
			return d, errors.Errorf("unsupported int8 format code: %d", code)
		}
	case oid.T_float4:
		switch code {
		case formatText:
			f, err := strconv.ParseFloat(string(b), 64)
			if err != nil {
				return d, err
			}
			d = parser.NewDFloat(parser.DFloat(f))
		case formatBinary:
			if len(b) < 4 {
				return d, errors.Errorf("float4 requires 4 bytes for binary format")
			}
			f := math.Float32frombits(binary.BigEndian.Uint32(b))
			d = parser.NewDFloat(parser.DFloat(f))
		default:
			return d, errors.Errorf("unsupported float4 format code: %d", code)
		}
	case oid.T_float8:
		switch code {
		case formatText:
			f, err := strconv.ParseFloat(string(b), 64)
			if err != nil {
				return d, err
			}
//.........这里部分代码省略.........

func typByVal(typ parser.Type) parser.Datum {
	_, variable := typ.Size()
	return parser.MakeDBool(parser.DBool(!variable))
}

				addColumn := func(column *sqlbase.ColumnDescriptor, attRelID parser.Datum, colNum int) error {
					colTyp := column.Type.ToDatumType()
					return addRow(
						attRelID,                            // attrelid
						parser.NewDString(column.Name),      // attname
						typOid(colTyp),                      // atttypid
						zeroVal,                             // attstattarget
						typLen(colTyp),                      // attlen
						parser.NewDInt(parser.DInt(colNum)), // attnum
						zeroVal,      // attndims
						negOneVal,    // attcacheoff
						negOneVal,    // atttypmod
						parser.DNull, // attbyval (see pg_type.typbyval)
						parser.DNull, // attstorage
						parser.DNull, // attalign
						parser.MakeDBool(parser.DBool(!column.Nullable)),          // attnotnull
						parser.MakeDBool(parser.DBool(column.DefaultExpr != nil)), // atthasdef
						parser.MakeDBool(false),                                   // attisdropped
						parser.MakeDBool(true),                                    // attislocal
						zeroVal,                                                   // attinhcount
						parser.DNull,                                              // attacl
						parser.DNull,                                              // attoptions
						parser.DNull,                                              // attfdwoptions
					)
				}

				// Columns for table.
				colNum := 0
				if err := forEachColumnInTable(table, func(column *sqlbase.ColumnDescriptor) error {
					colNum++
					tableID := h.TableOid(db, table)

	COLUMN_NAME STRING NOT NULL DEFAULT '',
	"COLLATION" STRING NOT NULL DEFAULT '',
	CARDINALITY INT NOT NULL DEFAULT 0,
	DIRECTION STRING NOT NULL DEFAULT '',
	STORING BOOL NOT NULL DEFAULT FALSE 
);`,
	populate: func(p *planner, addRow func(...parser.Datum) error) error {
		return forEachTableDesc(p,
			func(db *sqlbase.DatabaseDescriptor, table *sqlbase.TableDescriptor) error {
				appendRow := func(index *sqlbase.IndexDescriptor, colName string, sequence int,
					direction string, isStored bool) error {
					return addRow(
						defString,                                    // table_catalog
						parser.NewDString(db.GetName()),              // table_schema
						parser.NewDString(table.GetName()),           // table_name
						parser.MakeDBool(parser.DBool(index.Unique)), // non_unique
						parser.NewDString(db.GetName()),              // index_schema
						parser.NewDString(index.Name),                // index_name
						parser.NewDInt(parser.DInt(sequence)),        // seq_in_index
						parser.NewDString(colName),                   // column_name
						parser.DNull,                                 // collation
						parser.DNull,                                 // cardinality
						parser.NewDString(direction),                 // direction
						parser.MakeDBool(parser.DBool(isStored)),     // storing
					)
				}

				return forEachIndexInTable(table, func(index *sqlbase.IndexDescriptor) error {
					sequence := 1
					for i, col := range index.ColumnNames {
						// We add a row for each column of index.