WL#1894: Add row id's when sorting after ordered index scan
Affects: Server-5.0 — Status: Assigned — Priority: Medium
When returning rows from ordered scans duplicate rows are possible. In MySQL merge join algorithm duplicate rows sometimes have to be filtered out. To do this efficiently a unique row id is set for each row returned. In the handler this could be done in two ways: 1) Create row id's in the sorting 2) Fetch the tuple id's
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