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04ef45cb5b
- In Spider, calling cmp_ref() can be very expensive. In ha_partition.cc
we don't anymore sort rows according to position for the Spider
engine.
- Removed Spider specific call info(HA_EXTRA_STARTING_ORDERED_INDEX_SCAN)
from handle_ordered_index_scan(). It's caused performance issues and
does not change results for queries with ORDER BY.
- The visible effect of this patch is that for some storage engines,
rows may be returned in a different order if there is no ORDER BY clause.
- Based in Spiral Patch 052:
052_mariadb-10.2.0.add_partition_skip_pk_sort_for_non_clustered_index.diff
MDEV-7748
- The major difference from original patch is that there is no variable to
get the old behaviour.
- Other things:
- Optimized ha_partition::cmp_ref() and cmp_part_ids() to make them
simpler and faster.
- Changed arguments to cmp_key_part_id() to be same as cmp_key_rowid_part_id
to simplify code.
Original author: Kentoku SHIBA
First reviewer: Jacob Mathew
Second reviewer: Michael Widenius
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| .. | ||
| archive | ||
| blackhole | ||
| cassandra | ||
| connect | ||
| csv | ||
| example | ||
| federated | ||
| federatedx | ||
| heap | ||
| innobase | ||
| maria | ||
| mroonga | ||
| myisam | ||
| myisammrg | ||
| oqgraph | ||
| perfschema | ||
| rocksdb | ||
| sequence | ||
| sphinx | ||
| spider | ||
| test_sql_discovery | ||
| tokudb | ||
| xtradb | ||