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|
package column
import (
"fmt"
"github.com/ClickHouse/clickhouse-go/lib/binary"
"reflect"
"strconv"
"time"
)
type Tuple struct {
base
columns []Column
}
func (tuple *Tuple) Read(decoder *binary.Decoder, isNull bool) (interface{}, error) {
return nil, fmt.Errorf("do not use Read method for Tuple(T) column")
}
func (tuple *Tuple) ReadTuple(decoder *binary.Decoder, rows int) ([]interface{}, error) {
var values = make([][]interface{}, rows)
for _, c := range tuple.columns {
switch column := c.(type) {
case *Array:
cols, err := column.ReadArray(decoder, rows)
if err != nil {
return nil, err
}
for i := 0; i < rows; i++ {
values[i] = append(values[i], cols[i])
}
case *Nullable:
cols, err := column.ReadNull(decoder, rows)
if err != nil {
return nil, err
}
for i := 0; i < rows; i++ {
values[i] = append(values[i], cols[i])
}
case *Tuple:
cols, err := column.ReadTuple(decoder, rows)
if err != nil {
return nil, err
}
for i := 0; i < rows; i++ {
values[i] = append(values[i], cols[i])
}
default:
for i := 0; i < rows; i++ {
value, err := c.Read(decoder, false)
if err != nil {
return nil, err
}
values[i] = append(values[i], value)
}
}
}
var ret = make([]interface{}, rows)
for i := range values {
ret[i] = values[i]
}
return ret, nil
}
func (tuple *Tuple) Write(encoder *binary.Encoder, v interface{}) (err error) {
return fmt.Errorf("unsupported Tuple(T) type [%T]", v)
}
func parseTuple(name, chType string, timezone *time.Location) (Column, error) {
var columnType = chType
chType = chType[6 : len(chType)-1]
var types []string
var last, diff int
for i, b := range chType + "," {
if b == '(' {
diff++
} else if b == ')' {
diff--
} else if b == ',' && diff == 0 {
types = append(types, chType[last:i])
last = i + 2
}
}
var columns = make([]Column, 0, len(types))
for i, chType := range types {
column, err := Factory(name+"."+strconv.Itoa(i+1), chType, timezone)
if err != nil {
return nil, fmt.Errorf("%s: %v", chType, err)
}
columns = append(columns, column)
}
return &Tuple{
base: base{
name: name,
chType: columnType,
valueOf: reflect.ValueOf([]interface{}{}),
},
columns: columns,
}, nil
}
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