star schemas and compensate when computing whether or not to use Bloom
filters.
FossilOrigin-Name: 21daf2463ef70e6b5dc73ba5bf62b3d2fb504e9189f645ac74b513d3d8b979c2
query, but it causes performance regressions on a host of others. Disable it
(at least temporarily) in order to try to find an alternative way of fixing the
one specific query that it was created to fix - an alternative way that does
not cause performance problems for other unrelated queries.
FossilOrigin-Name: d9625a9eafe88859c3255849ee750cc6322d5a13ddad45107f9b2085c20eff50
it can return a "maybe" result for aggregate queries where we are not exactly
sure. The index is scored as if it is covering, but the main table is
still opened.
FossilOrigin-Name: b8eec4214363192e6f3e12b3faa5810d8269a5fdaecab3ec09b02e5002cf798a
first check-in merely improves a parameter name to sqlite3WhereBegin() to
be more descriptive of what it contains, and ensures that a subroutine is
not inlines so that sqlite3WhereBegin() runs slightly faster.
FossilOrigin-Name: cadf5f6bb1ce0492ef858ada476288e8057afd3609caa18b09c818d3845d7244
the prior [a47efb7c8520a011] enhancement from 2017 obsolete. This check-in
removes the older optimization.
FossilOrigin-Name: 56442c9bdd7844454c79acf83323380ea3509cb2e0b9a3d538a6b51726ae6d07
[bfd5bf2c73110fcb] (2021-02-21) been called "SrcItem". Comment changes
only. No changes to code.
FossilOrigin-Name: e3648a07f5607dbd4d6ad5b6e5a62a4a1d0b173d3f22aa36c74b768281fc86d8
table scan for a materialized view or subquery if the full scan is the
outer-most loop. This is shown to speed up some queries.
FossilOrigin-Name: 609fbb94b8f01d6792e5941ab23ce041313d359f6788c4dde6b1ca749ab49137
chekc-in [f237e1d8cc41b937]. The bug was detected by dbsqlfuzz
test case 4c5e3e89bc251d28378be88233f531b84ec66901.
FossilOrigin-Name: 764b71267e0b31ff7eaf2a0def7526a1a02dce4d5b456dea060d97ed342efdd1
escapes the subroutine, then abort the prepared statement with a descriptive
error and SQLITE_INTERNAL. This extra sanity check causes many tests to
fail.
FossilOrigin-Name: 2c5bb2bff26cc70d8cac78ddd12d5ac37ab1472f5f88afbd975950a18ac2804d
reduces the register pressure on that routine and helps it to run faster
in the common case where there is no RIGHT JOIN.
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the main query into the various OR-term subqueries, do not push down slices
of a vector comparison, since the right-hand operand of the comparison might
have only been initialized in a different OR branch that was not taken.
dbsqlfuzz 80a9fade844b4fb43564efc972bcb2c68270f5d1.
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at the end of the list, because that is no longer true. Instead, keep a
separate nBase count that is the size of the list excluding the tail of
virtual terms. Use nBase instead of nTerm when scanning terms that are not
virtual. Add assert()s to validate correctness of WhereClause.
FossilOrigin-Name: 6024682ca467fa4fe49608772b0bbfa2f8a419b32cebfa715941073c8b29da49
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
drh