end of an sqlite_stat1 entry does not have an N value that is too small.
Ticket [e4598ecbdd18bd82]
FossilOrigin-Name: 98357d8c1263920b33a3648ef9214a63c99728bafa7a8d3dd6a1241b2303fd42
exist. STAT4 continues to work as it always has, and as it is a superset of
STAT3 is the recommended replacement.
FossilOrigin-Name: 1e17ea2fd1df4ad49138c787c8fe3207dd0c25c93f9001d52a9b69f8c12e841c
with no affinity can appear in a zero-terminated string. Use the new
SQLITE_AFF_NONE macro for this new magic number.
FossilOrigin-Name: e8234f6939ccff4c10f741cf66d1c537cfebcbd0d1d79a618a64c755a7f087b5
but avoids identifying a skip-scan as order-distinct (because it is not)
and thus forces a separate b-tree to implement the DISTINCT clause of a
query. This undoes check-in [a871d69c6de65038] and substitutes a new fix.
FossilOrigin-Name: 89bf0399e87be76e7b264e0a35e8a6d3af0f9e71123a929c20754882b636ca70
read cursors to be closed after their usefulness ends during a two-pass
UPDATE.
FossilOrigin-Name: 7def6c8edd85f19ee09038e01541f75b1f71ca39b9fb782b8f0fcac89207c353
memory allocations by deferring memory allocation until
sqlite3VdbeResolveLabel() is called, at which point the code generator has
a better idea of how big the relocation table needs to be.
The sqlite3VdbeMakeLabel() routine now takes a Parse* parameter instead of
Vdbe*.
FossilOrigin-Name: 4a0929ac76d8aa5dd65eac3b83d6bbf41e505e01d175ca0fb2b19ba02d439415
encourage the compiler to inline that routine within sqlite3WhereBegin().
This gives a performance improvement.
FossilOrigin-Name: 3c2ad0e915e835b1cb2962879beff50b2745d0cefe1cfc89ef90b7879c139ce6
subroutine, and reuse that subroutine if the same subquery is evaluated more
than once. Current code does not work for CHECK constraints.
FossilOrigin-Name: 6c44838adbe5dc482bc010e91a6dd7a0f777c989f443dd600740d2c783208e0d
method returns SQLITE_CONSTRAINT then that particular combination of
constraints is considered unusable and does not participate further in
query planning.
FossilOrigin-Name: 684013cef6bfcfd920a4aec645df9f5d41ace8b34e75fca61759c1b4f82cc89e
SQLITE_QUERY_PLANNER_LIMIT_INCR to control the value for
WhereLoopBuilder.iPlanLimit, rather than embedding magic numbers in the
code.
FossilOrigin-Name: 903e501894b2a5dd7055b5154d74d4a47a619f76e66485a4d62b6259f10723d6
index+constraint options that can be considered for each table in a join.
This prevents certain pathological queries from taking up too much time
in the query planner.
FossilOrigin-Name: 8690b5a0cc08eeb175230de45d4ca9b9f7b9b22aeebea70b8b7151f10b130969
the WHERE clause of a query when "vtab" is a virtual table on the rhs of a
LEFT JOIN.
FossilOrigin-Name: 83da4d4104ee1870a2a95bb5fa15ee6584c655d8b314b6b8ab97592dad4ee811
of bugs for many years. We recent enhancements to the performance of the
OP_Column opcode, the removing the column cache actually makes speed-check.sh
run faster. It also saves about 1,800 bytes of code space.
FossilOrigin-Name: 3f5f60cd7529330209027fdae8129cca420cec1050eae50a7750d0b715b56972
only scenario where it is useful. This saves prepare time for the common
case of a simple query.
FossilOrigin-Name: 598d608359005b13fa1151c6c69f2fd12ef3ab7f563a035fc4a6f3c569dc6c67
prevents STAT4 data from being used but allows it to be loaded into the
Index objects. This permits STAT4 to be turned on and off on a per-statement
basis.
FossilOrigin-Name: 489f3caf5dcc8cace20a0da58ceb32fdea5770ba570fa3c9f712cd35e726846a
integers rather than "0x%p". This is more readable and yields the same result
on successive runs.
FossilOrigin-Name: a7cdc5bc85e0edfcc38f920c2ce91599bcbfdb49522d88b08c64596546d13881
objecct is constructed, instead of recomputing it every time it is needed.
FossilOrigin-Name: d735872ec383bbd220b08c61d25db9ff3675d2542b9e7867e7d6323a12e0cc23
are no OR operators in the WHERE clause, thus speeding up query planning
slightly.
FossilOrigin-Name: 292724ffc4bfca435fff309383d488ffdbe1e314e5eb26da21cf2f621b64bce5
