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Georgi Kodinov authored
The optimizer pulls up aggregate functions which should be aggregated in an outer select. At some point it may substitute such a function for a field in the temporary table. The setup_copy_fields function doesn't take this into account and may overrun the copy_field buffer. Fixed by filtering out the fields referenced through the specialized reference for aggregates (Item_aggregate_ref). Added an assertion to make sure bugs that cause similar discrepancy don't go undetected.
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