Method ColumnIndex

pkg/expression/schema.go:164–181

ColumnIndex finds the index for a column.

(col *Column)

// ColumnIndex finds the index for a column.
func (s *Schema) ColumnIndex(col *Column) int {
	backupIdx := -1
	for i, c := range s.Columns {
		if c.UniqueID == col.UniqueID {
			backupIdx = i
			if c.IsPrefix {
				// instead of returning a prefix column
				// prefer to find a full column
				// only clustered index table can meet this:
				//	same column `c1` maybe appear in both primary key and secondary index
				// so secondary index itself can have two `c1` column one for indexKey and one for handle
				continue
			}
			return i
		}
	}
	return backupIdx
}

// Contains checks if the schema contains the column.
func (s *Schema) Contains(col *Column) bool {