Analyze do a analyze request.

Checksum sends a checksum request.

IndexRangesToKVRanges converts index ranges to "KeyRange".

Select sends a DAG request, returns SelectResult.

TableHandlesToKVRanges converts sorted handle to kv ranges.

TableRangesToKVRanges converts table ranges to "KeyRange".

RequestBuilder is used to build a "kv.Request".

SelectResult is an iterator of coprocessor partial results.