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PARTITION BY SYSTEM_TIME INTERVAL ...

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Lots of changes:
* calculate the current history partition in ::external_lock(),
  not in ::write_row() or ::update_row()
* remove dynamically collected per-partition row_end stats
* no full table scan in open_table_from_share to calculate these
  stats, no manual MDL/thr_locks in open_table_from_share
* no shared stats in TABLE_SHARE = no mutexes or condition waits when
  calculating current history partition
* always compare timestamps, don't convert them to MYSQL_TIME
  (avoid DST ambiguity, and it's faster too)
* correct interval handling, 1 month = 1 month, not 30 * 24 * 3600 seconds
* save/restore first partition start time, and count intervals from there
* only allow to drop first partitions if INTERVAL
* when adding new history partitions, split the data in the last history
  parition, if it was overflowed
* show partition boundaries in INFORMATION_SCHEMA.PARTITIONS
This commit is contained in:
Sergei Golubchik
2018-02-21 15:16:19 +01:00
parent 7961bc4b89
commit e36c5ec0a5
16 changed files with 463 additions and 974 deletions
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8
sql/opt_range.cc
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@ -3463,13 +3463,6 @@ bool prune_partitions(THD *thd, TABLE *table, Item *pprune_cond)
DBUG_RETURN(FALSE);
}
if (part_info->part_type == VERSIONING_PARTITION &&
part_info->vers_update_range_constants(thd))
{
retval= TRUE;
goto end2;
}
dbug_tmp_use_all_columns(table, old_sets,
table->read_set, table->write_set);
range_par->thd= thd;
@ -3569,7 +3562,6 @@ all_used:
mark_all_partitions_as_used(prune_param.part_info);
end:
dbug_tmp_restore_column_maps(table->read_set, table->write_set, old_sets);
end2:
thd->no_errors=0;
thd->mem_root= range_par->old_root;
free_root(&alloc,MYF(0)); // Return memory & allocator