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8 check-ins related to "skip-scan"

Merge the skip-scan enhancement into trunk. check-in: b0bb975c user: drh tags: trunk
Import the "PRAGMA vdbe_eqp" enhancement and the enhanced EXPLAIN formatting the shell from trunk. Fix a bug in skip-scan and add a test case to prevent a regression. Closed-Leaf check-in: f668616a user: drh tags: skip-scan
In the shell tool, if an "EXPLAIN" command is executed in ".explain on" mode, attempt to automatically indent the bodies of loops in the output VDBE program. check-in: e7d34ec6 user: dan tags: trunk
Add VDBE comments to the beginning and end of skip-scan loops. check-in: 0c85d93b user: drh tags: skip-scan
Improve the way that skip-scan loops are constructued. Add test cases. Improved the scoring of skip-scan loops. check-in: 5e75ab93 user: drh tags: skip-scan
Add test cases for skip-scan. Enhance "do_test" so that if the expected result is of the form "/*..*/" or "~/*..*/" it treats the expected result as a glob pattern rather than as a regular expression. Fix a bug in ANALYZE result loading associated with WITHOUT ROWID tables. check-in: d3e6e9b2 user: drh tags: skip-scan
Add the ability to use an index even if the left-most columns of the index are unconstrainted, provided that the left-most columns have few distinct values. check-in: 27dd5993 user: drh tags: skip-scan
Avoid an unnecessary OP_IfNull while doing an indexed search. check-in: 51960009 user: drh tags: trunk