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8 Commits

Author SHA1 Message Date
drh 66c48907a2 Remove the legacy_file_format PRAGMA. In its place, provide the 
SQLITE_DBCONFIG_LEGACY_FILE_FORMAT option to sqlite3_db_config().
Fix for ticket [6484e6ce678fffab]

FossilOrigin-Name: 4d424f3047b48fc441475137f30a719d2f079390c86fe2617710ddfb05c5e240
 2019-10-29 16:18:45 +00:00
dan f7c92e82d2 Avoid assuming that "column IS ?", where column is declared UNIQUE, matches only a single row (as "?" might be NULL). Fix for [b8689402]. 
FossilOrigin-Name: d02490a2f0cae047087130b4ad8f55f265845c2ffb3bde3b7d507edb54acea6d
 2019-08-21 14:54:50 +00:00
dan a79a0e733f When using an index for both DISTINCT and ORDER BY, do not confuse the number of columns required for distinctness with the number required to get the correct sort order. Fix for [6749cb3c]. 
FossilOrigin-Name: b47169319ad88e8ffdbe8fbb91f4cced81ebd5c0ee1b018be2d0256c9a1c5159
 2019-07-29 14:42:56 +00:00
drh fa337cc115 Completely disable the skip-ahead-distinct optimization for all but the 
inner-most loop of a DISTINCT join.  Fix for ticket [ef9318757b152e3a26e9592]

FossilOrigin-Name: b7595cf2cadcba486e60b3c230ccc412a7cf449c1d56cbe65869e6d5d9f1374d
 2017-11-23 00:45:21 +00:00
drh 065b34f6e5 Fix the skip-ahead-distinct optimization on joins for cases there the table 
in the inner loop of the join does not contribute any columns to the
result set.  Proposed fix for ticket [ef9318757b152e3a2]

FossilOrigin-Name: 2dcef5a9ae7f347da65207bf6bf612fb12e18e1a6704799322f0cf2a86154cfd
 2017-11-21 23:38:48 +00:00
drh 172806e489 Fix the skip-ahead-distinct optimization so that it works with indexes that 
have repeated columns with different collating sequences.

FossilOrigin-Name: ce1e2b88777e00a82c04abe5ba35eec81b5f324e462f099cd00b21054f369688
 2017-04-13 21:29:02 +00:00
dan a74f5c2923 New test cases and minor fixes for the optimization on this branch. 
FossilOrigin-Name: 70ac9ea1a6cb2f4906f00f1a04f668e5ba5eeed8d4d0fa4be57a9c9eb0683697
 2017-04-13 18:33:33 +00:00
drh 8489bf5aff Forward port the skip-ahead-distinct branch which was abandoned for some reason 
that I do not recall.  This port should have been achived by a merge of trunk
into the previous head of skip-ahead-distinct, but that did not work.  So I had
to manually "rebase" the changes.

FossilOrigin-Name: 132339a1fb0b9664df4d3eefbed6e77ef100ba95a91dcc622da7bd3fcdfcd6af
 2017-04-13 01:19:30 +00:00