mirror of
https://github.com/uptrace/go-clickhouse.git
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101 lines
2.1 KiB
Go
101 lines
2.1 KiB
Go
package chschema
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import (
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"reflect"
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"github.com/uptrace/go-clickhouse/ch/chproto"
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)
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type NullableColumn struct {
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Nulls UInt8Column
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Values Columnar
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nullable reflect.Value // reflect.Slice
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}
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func NullableNewColumnFunc(fn NewColumnFunc) NewColumnFunc {
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return func(typ reflect.Type, chType string, numRow int) Columnar {
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return &NullableColumn{
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Values: fn(typ, chType, numRow),
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}
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}
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}
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var _ Columnar = (*NullableColumn)(nil)
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func (c *NullableColumn) Type() reflect.Type {
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return reflect.PtrTo(c.Values.Type())
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}
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func (c *NullableColumn) Set(v any) {
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panic("not reached")
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}
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func (c *NullableColumn) AppendValue(v reflect.Value) {
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if v.IsNil() {
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c.Nulls.Column = append(c.Nulls.Column, 1)
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c.Values.AppendValue(reflect.New(c.Values.Type()).Elem())
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} else {
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c.Nulls.Column = append(c.Nulls.Column, 0)
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c.Values.AppendValue(v.Elem())
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}
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}
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func (c *NullableColumn) Value() any {
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return c.nullable.Interface()
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}
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func (c *NullableColumn) Nullable(nulls UInt8Column) any {
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panic("not implemented")
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}
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func (c *NullableColumn) Len() int {
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return c.Values.Len()
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}
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func (c *NullableColumn) Index(idx int) any {
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elem := c.nullable.Index(idx)
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if elem.IsNil() {
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return nil
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}
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return elem.Elem().Interface()
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}
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func (c *NullableColumn) Slice(s, e int) any {
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panic("not implemented")
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}
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func (c *NullableColumn) ConvertAssign(idx int, dest reflect.Value) error {
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if idx < len(c.Nulls.Column) && c.Nulls.Column[idx] == 1 {
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return nil
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}
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if dest.IsNil() {
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dest.Set(reflect.New(dest.Type().Elem()))
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}
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return c.Values.ConvertAssign(idx, dest.Elem())
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}
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func (c *NullableColumn) ReadFrom(rd *chproto.Reader, numRow int) error {
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if numRow == 0 {
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return nil
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}
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if err := c.Nulls.ReadFrom(rd, numRow); err != nil {
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return err
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}
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if err := c.Values.ReadFrom(rd, numRow); err != nil {
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return err
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}
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c.nullable = reflect.ValueOf(c.Values.Nullable(c.Nulls))
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return nil
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}
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func (c *NullableColumn) WriteTo(wr *chproto.Writer) error {
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if err := c.Nulls.WriteTo(wr); err != nil {
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return err
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}
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return c.Values.WriteTo(wr)
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}
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func isNilValue(v reflect.Value) bool {
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return false
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}
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