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Overview
Comment:Add the xBestIndex enhancement to the 3.21.0 change log.
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA3-256: 2e695cb38031c631b1844c9eaac931a05bffc99c89ce0525428a9e6afbb29ea9
User & Date: drh 2017-09-11 21:09:15
Context
2017-09-11
23:48
Add the b899b6042f97f5 ticket fix to the change log. check-in: 5257ab389b user: drh tags: trunk
21:09
Add the xBestIndex enhancement to the 3.21.0 change log. check-in: 2e695cb380 user: drh tags: trunk
2017-09-01
20:53
Updates to the size and performance chart check-in: 5e4cd244d1 user: drh tags: trunk
Changes
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Changes to pages/changes.in.

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<li> Improved de-quoting of column names for [CREATE TABLE AS] statements with
     an aggregate query on the right-hand side.
<li> Fewer "stat()" system calls issued by the unix VFS.
<li> Query planner enhancements:
<ol type="a">
<li> Enhanced the [LIKE optimization] so that it works with an ESCAPE clause.
</ol>


<li> Enhanced the [CSV virtual table] so that it accepts the last row of
     input if the final new-line character is missing.
<li> Remove the rarely-used "scratch" memory allocator.  Replace it with the
     [SQLITE_CONFIG_SMALL_MALLOC] configuration setting that gives SQLite
     a hint large memory allocations should be avoided when possible.
<li> Added the swarm virtual table to the existing union virtual table extension.
<li> Miscellaneous [microoptimizations] reduce CPU usage by about 2.0%.







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<li> Improved de-quoting of column names for [CREATE TABLE AS] statements with
     an aggregate query on the right-hand side.
<li> Fewer "stat()" system calls issued by the unix VFS.
<li> Query planner enhancements:
<ol type="a">
<li> Enhanced the [LIKE optimization] so that it works with an ESCAPE clause.
</ol>
<li> Pass information about !=, IS, IS NOT, NOT NULL, and IS NULL constraints
     into the [xBestIndex] method of virtual tables.
<li> Enhanced the [CSV virtual table] so that it accepts the last row of
     input if the final new-line character is missing.
<li> Remove the rarely-used "scratch" memory allocator.  Replace it with the
     [SQLITE_CONFIG_SMALL_MALLOC] configuration setting that gives SQLite
     a hint large memory allocations should be avoided when possible.
<li> Added the swarm virtual table to the existing union virtual table extension.
<li> Miscellaneous [microoptimizations] reduce CPU usage by about 2.0%.