indexes, make sure not to do so if the term being disabled is a transitive
constraint. Fix for the problem identified by
[forum:forumpost/eb8613976a|forum post eb8613976a].
FossilOrigin-Name: f1f9b5de3c59489b94963685660b3ddc45eece5535b02fec399b6ece0e38563d
where the statistics deceive the query planner into using a scan when
an indexed lookup would be better. This check-in changes the code
generation to do the IN-scan using a new OP_SeekScan opcode. That new
opcode is designed to abandon the scan and fall back to a seek if
it doesn't find a match quickly enough. For this work-in-progress check-in,
OP_SeekScan is still a no-op and OP_SeekGE still ends up doing all the work.
FossilOrigin-Name: d720b6981eeb0ffdb14494ca63eca298ee724ae4ad4863c7c7cbfdad7fa52519
using the index rather than the main table, so as to avoid unnecessary
main table seeks.
FossilOrigin-Name: 2f7cb6ab39e54fd6eb3a280d3022c3d4f4ed92e83af7226e63e0199a96397a6b
a term is seen to be of low selectivity, it merely sets a new flag
(the TERM_HIGHTRUTH flag) which causes whereLoopOutputAdjust() to ignore
that term.
FossilOrigin-Name: 4558163b6a525990f0f1b6629dbb76daf49bcaf1ddbaf0c50fe05ce9ee480ff8
probability of WHERE clause terms that do not participate in the index.
FossilOrigin-Name: 1babd6ec5d60e2c34aa1c0285ead768a88004218468e97262411973fe3487022
has not already completed. Also add the sqlite3WhereUsesDeferredSeek()
interface to the query planner. The UPDATE implementation adds an
OP_FinishSeek before running the final OP_Insert if one is needed.
Ticket [ec8abb025e78f40c] and also an assertion fault reported by Yongheng.
FossilOrigin-Name: 21ef6e99331210b80fa7c71b4f02e8f768a748d01aef884368af2f6b51a067e0
bit rather than adding extra EP_Collate bits, to single later processing that
the order of precedence for COLLATE operators is inverted.
Fix for ticket [b47e3627ecaadbde]
FossilOrigin-Name: 90f7c477354d67d22d5eb0da22dac579f384ab44743fdc19887220e32203ebc2
WHERE clause processing, be sure not to use the commuted operator to qualify
a partial index, as insufficient COLLATE information is preserved to verify
that the expression will correctly qualify the index.
Ticket [767a8cbc6d20bd68]
FossilOrigin-Name: 5351e920f489562f959ab8a376ff720f845ea165e0cdc7c3a271aac53c2aa64a
normal scan and 1 when scanning nulls. This enables the re-do jump at the
bottom of the loop to be coded with a single OP_IfNotZero opcode, rather
than a sequence of OP_If, OP_Integer, OP_Goto.
FossilOrigin-Name: bf875e1a259a4167694e06349458452dc36c1d38aa6843518d9ae46ce74e5559
exist. STAT4 continues to work as it always has, and as it is a superset of
STAT3 is the recommended replacement.
FossilOrigin-Name: 1e17ea2fd1df4ad49138c787c8fe3207dd0c25c93f9001d52a9b69f8c12e841c
encourage the compiler to inline that routine within sqlite3WhereBegin().
This gives a performance improvement.
FossilOrigin-Name: 3c2ad0e915e835b1cb2962879beff50b2745d0cefe1cfc89ef90b7879c139ce6
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
are no OR operators in the WHERE clause, thus speeding up query planning
slightly.
FossilOrigin-Name: 292724ffc4bfca435fff309383d488ffdbe1e314e5eb26da21cf2f621b64bce5
operator on columns to the right of multicolumn indexes. If the OP_Noop
generated where were really a new opcode that checked to see if there existed
any entries in the index with a matching prefix, it might prevent unnecessary
iterations of the IN operator.
FossilOrigin-Name: 92f0fe155d5546fc7f4a443d0630613dabe149061966308e5420fad652278f16
the --disable-amalgamation and the --enable-debug options to ./configure
using clang.
FossilOrigin-Name: 813224363d9ac22fcb37f657c4ac988f76fa39989301faec7206e9ba0b1f4476
on expressions in place of equivalent expressions in the result set or in
the WHERE clause. This check-in compiles but is mostly untested.
FossilOrigin-Name: a52ef2ad7c0e14b78b801f16a1f6ea8d8fa9ae5d7d810e18dd24c600b662a312
affected by the sqlite_stat1 data. Also, change the column names of the
"PRAGMA stats" command so that they are not keywords.
FossilOrigin-Name: fb2b8ae8310e4ea4b42354bbf36c3084a9d5c6d7
ORDER BY then try to cut short each invocation of the inner loop once the
LIMIT has been satisfied. This check-in is a partial implementation only.
FossilOrigin-Name: 852d1eda6ecca1171f6ed800b06f5b4854672002
result in a slightly smaller and slightly faster executable. More work could
be done to make this cleaner.
FossilOrigin-Name: 2081d75767dc590b4c8457e5f8e5f18ba5f8eaa7
drh