コード例 #1
0
func encodeEndConstraintDescending(spans []span, c *parser.ComparisonExpr,
	isLastEndConstraint bool) {
	switch c.Operator {
	case parser.IsNot:
		// An IS NOT NULL expressions allows us to constrain the end of the range
		// to stop at NULL.
		if c.Right != parser.DNull {
			panic(fmt.Sprintf("expected NULL operand for IS NOT operator, found %v", c.Right))
		}
		for i := range spans {
			spans[i].end = encoding.EncodeNotNullDescending(spans[i].end)
		}
	default:
		datum := c.Right.(parser.Datum)
		if c.Operator != parser.GT {
			for i := range spans {
				spans[i].end = encodeInclusiveEndValue(
					spans[i].end, datum, encoding.Descending, isLastEndConstraint)
			}
			break
		}
		if !isLastEndConstraint {
			panic(fmt.Sprintf("can't have other end constraints after a '>' constraint, found %v", c.Operator))
		}
		key, err := encodeTableKey(nil, datum, encoding.Descending)
		if err != nil {
			panic(err)
		}
		// Append the constraint to all of the existing spans.
		for i := range spans {
			spans[i].end = append(spans[i].end, key...)
		}
	}
}
コード例 #2
0
ファイル: rowwriter.go プロジェクト: YuleiXiao/cockroach
// deleteRow adds to the batch the kv operations necessary to delete a table row
// with the given values.
func (rd *rowDeleter) deleteRow(b *client.Batch, values []parser.Datum) error {
	if err := rd.fks.checkAll(values); err != nil {
		return err
	}

	primaryIndexKey, secondaryIndexEntries, err := rd.helper.encodeIndexes(rd.fetchColIDtoRowIndex, values)
	if err != nil {
		return err
	}

	for _, secondaryIndexEntry := range secondaryIndexEntries {
		if log.V(2) {
			log.Infof("Del %s", secondaryIndexEntry.Key)
		}
		b.Del(secondaryIndexEntry.Key)
	}

	// Delete the row.
	rd.startKey = roachpb.Key(primaryIndexKey)
	rd.endKey = roachpb.Key(encoding.EncodeNotNullDescending(primaryIndexKey))
	if log.V(2) {
		log.Infof("DelRange %s - %s", rd.startKey, rd.endKey)
	}
	b.DelRange(&rd.startKey, &rd.endKey, false)
	rd.startKey, rd.endKey = nil, nil

	return nil
}
コード例 #3
0
ファイル: table.go プロジェクト: yangxuanjia/cockroach
// EncodeIndexKey creates a key by concatenating keyPrefix with the encodings of
// the columns in the index.
//
// If a table or index is interleaved, `encoding.encodedNullDesc` is used in
// place of the family id (a varint) to signal the next component of the key.
// An example of one level of interleaving (a parent):
// /<parent_table_id>/<parent_index_id>/<field_1>/<field_2>/NullDesc/<table_id>/<index_id>/<field_3>/<family>
//
// Returns the key and whether any of the encoded values were NULLs.
//
// Note that ImplicitColumnIDs are not encoded, so the result isn't always a
// full index key.
func EncodeIndexKey(
	tableDesc *TableDescriptor,
	index *IndexDescriptor,
	colMap map[ColumnID]int,
	values []parser.Datum,
	keyPrefix []byte,
) (key []byte, containsNull bool, err error) {
	key = keyPrefix
	colIDs := index.ColumnIDs
	dirs := directions(index.ColumnDirections)

	if len(index.Interleave.Ancestors) > 0 {
		for i, ancestor := range index.Interleave.Ancestors {
			// The first ancestor is assumed to already be encoded in keyPrefix.
			if i != 0 {
				key = encoding.EncodeUvarintAscending(key, uint64(ancestor.TableID))
				key = encoding.EncodeUvarintAscending(key, uint64(ancestor.IndexID))
			}

			length := int(ancestor.SharedPrefixLen)
			var n bool
			key, n, err = EncodeColumns(colIDs[:length], dirs[:length], colMap, values, key)
			if err != nil {
				return key, containsNull, err
			}
			colIDs, dirs = colIDs[length:], dirs[length:]
			containsNull = containsNull || n

			// We reuse NotNullDescending (0xfe) as the interleave sentinel.
			key = encoding.EncodeNotNullDescending(key)
		}

		key = encoding.EncodeUvarintAscending(key, uint64(tableDesc.ID))
		key = encoding.EncodeUvarintAscending(key, uint64(index.ID))
	}

	var n bool
	key, n, err = EncodeColumns(colIDs, dirs, colMap, values, key)
	containsNull = containsNull || n
	return key, containsNull, err
}
コード例 #4
0
ファイル: select.go プロジェクト: surpass/cockroach
func encodeEndConstraintDescending(spans []span, c *parser.ComparisonExpr,
	isLastEndConstraint bool) {
	switch c.Operator {
	case parser.IsNot:
		// An IS NULL expressions allows us to constrain the end of the range
		// to stop at NULL.
		if c.Right != parser.DNull {
			panic("Expected NULL operand for IS NOT operator.")
		}
		for i := range spans {
			spans[i].end = encoding.EncodeNotNullDescending(spans[i].end)
		}
	case parser.GE, parser.EQ:
		datum := c.Right.(parser.Datum)
		for i := range spans {
			spans[i].end = encodeInclusiveEndValue(
				spans[i].end, datum, encoding.Descending, isLastEndConstraint)
		}
	case parser.GT:
		panic("'>' operators should have been transformed to '>='.")
	default:
		panic(fmt.Errorf("unexpected operator: %s", c.String()))
	}
}