Refine error handling for partialIndexWorker/partialTableWorker for IndexMerge
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type/enhancement
- Dominant language
- Go
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Description
## Enhancement
https://github.com/pingcap/tidb/blob/master/executor/index_merge_reader.go#L401
partialTableWorker and partialIndexWorker didn't handle error for `fetchHandles` and `SelectResult.Close()`, may cause error is ignored unexpectedly.
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