[bcac937526d9a6ef]. Subsequent query planner enhancements for dealing
with star-queries make that change unnecessary and the change was recently
found to cause a performance regression in an unrelated query.
Also fix a typo in a debugging message.
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of "u16" or "i16" since the compiler complains less and generates faster
code.
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happen during memory allocation. No problems fixed; this change is just
to make future maintenance easier.
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(1) Extra paranoid defense against integer overflow.
(2) Remove a stray blank line in an FTS5 comment.
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still make an entry in the sqlite_stat1 table for the partial index, so that
we know that "PRAGMA optimize" does not need to redo the whole table.
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fewer CPU cycles. These changes were spotted while working on the nearby
enhanced-stat1 branch. So even if enhanced-stat1 is abandoned, that effort
put into it will not have been in vain.
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This branch accomplishes the same end as the nearby enhanced-stat1 branch,
but with much less change and hence less risk.
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the sqlite_stat4 table under multiple names because it is a WITHOUT ROWID
primary key index. [forum:/info/537d8ab118df7edd|Forum post 537d8ab118df7edd]
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some entries use a different case than others. Fix for
[forum:/info/6c118daad0f1f5ef|forum post 6c118daad0f1f5ef].
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New assert() statements added to help verify that memory allocation is
correct, and to help fuzzer find lingering errors.
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fix for [forum:/forumpost/07de5f6216|forum post 07de5f6216]. The register
allocation logic in ANALYZE needs to be completely refactored, but that will
take longer. This check-in will serve to resolve the issue until a better
fix can be devised.
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the reusable register cache that might contain registers in the STAT4
buffer region. This additional change corrects the problem.
[forum:/forumpost/83cb4a95a0|Forum post 83cb4a95a0]. Test case in TH3.
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indexes with differing numbers of columns.
[forum:/forumpost/bc39e531e5|forum post bc39e531e5].
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in place of the expression that is being indexed. This particular check-in
mostly works, but there are still issues.
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1.0 and 1.1, then round it down to 1 rather than the using the default rounding
rule of changing it to 2. The reduces the estimation error for the
case where a column value is very nearly, but not quite unique.
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virtual tables) before trying to load them
(dbsqlfuzz bc02a0cde82dee801a8d6f653d2831680f87dca1). This prevents
sqlite3_declare_vtab() from running with db->init.busy turned on. Even so,
enhance sqlite3_declare_vtab() to be able to deal with db->init.busy being on,
in case there are undiscovered paths to that state.
Each of these two changes are independently sufficient to prevent the problem
fixed by the previous check-in [c7560c1329965ab5] but there
is no harm in keeping that third layer of protection in place.
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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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also fixes a harmless use of an uninitialized integer variable as an input
to the %d format on a VDBE comment.
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ANALYZE when N is positive. Positive N also disables collecting stat4.
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that sets a threshold at which ANALYZE starts to use approximations during
the analysis process.
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off of samples of the entire index and does not need to read the entire
index.
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OP_Function or OP_PureFunc opcodes are coded directly, rather than using
the intermediate OP_Function0 or OP_PureFunc0 - opcodes that are now removed.
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