structure associated with an aggregate query is deallocated, for a performance
increase and size reduction.
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results in a buffer and plays them all back after the DML statement
completes. This avoids problems with interleaved DML statements.
This particular check-in is a non-functional work in progress.
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the pReturning field to the uninitialized area in the Parse object, to
save memset() time.
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the new bits to disable the min/max optimization, so that we can more easily
verify that we get the same answer both with and within that optimization.
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[/info/b8ba2f17f938c035|check-in b8ba2f17f938c035] to fix the performance
regression identified by
[forum:/forumpost/623f571482|forum post 623f571482].
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Actually making this work, though, will involve a lot more code which will
likely slow down processing for the common case where there is no
RETURNING clause. Furthermore, RETURNING seems to be of limited usefulness
and it is not standard SQL. So we abandon it here. These experimental
changes are parked in a branch as an historical reference. If circumstances
changes, we might take up the cause again some day.
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and add a mechanism to detect situations where this might occur in the
future.
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use that list as a place to put other sub-objects that need to be deallocated.
Have a single such list for infrequently used sub-objects is more efficient
than doing an a separate check for each kind of sub-object.
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intrinsics. See
[forum:/forumpost/fc0237a39b30ac0a|forum post fc0237a39b30ac0a].
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Any use of ON CONFLICT will likely lead to memory faults. This is an
incremental check-in to save my place.
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The idea is that this iterator can be enhanced to traverse the indexes in
any order, as required by multi-index UPSERT.
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very last clause may omit the conflict target, but the conflict target may
now be omitted for the DO UPDATE resolution.
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an index when most of the rows will be selected. This branch is trying to
tune the query planner to make that happen more often.
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Fix to check-in [ac31edd3eeafcef4] which was itself a fix for ticket
[45f4bf4eb4ffd788].
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be resolved, add the OP_FinishSeek opcode after all WHERE clause terms have
been processed. This obviates the need for the WHERE_SEEK_TABLE and
WHERE_SEEK_UNIQ_TABLE flags to sqlite3WhereBegin() and the ensuing
complication, and it allows the covering index optimization to be used
further into WHERE clause processing.
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