Type:
Task
Priority:
Major
Resolution:
Unresolved
Current code assumes that window function computation is a once-in-a-query
event. It creates Item and Cached_item objects, and allocates things on
thd->mem_root.
This task is separate the computations into
Stage #1: a part that is done once
Stage #2: a part that is re-run for every select re-execution.
Also, all 'cursor' objects must be created at stage #1.
is part of
MDEV-6115
window functions as in the SQL standard
Closed
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