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Prevent reading records from different index when merging temp index #45847

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tangenta opened this issue Aug 7, 2023 · 0 comments · Fixed by #54143
Closed

Prevent reading records from different index when merging temp index #45847

tangenta opened this issue Aug 7, 2023 · 0 comments · Fixed by #54143
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tangenta commented Aug 7, 2023

Enhancement

From #45679 (comment):

tidb/ddl/backfilling.go

Line 549 in cf7ae4c

prefix = t.IndexPrefix()

t.IndexPrefix() is the key like t[tableID]_i. If we use t.IndexPrefix().PrefixNext() here, endKey will be t[tableID]_j?

As a result, we will scan the index records from all indexes.
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ddl: skip getting actual end key for each range in ingest mode tangenta/tidb
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