Documentation Source Text

<li>Cut-over to the [next generation query planner] for faster and better query plans.
<li>The [EXPLAIN QUERY PLAN] output no longer shows an estimate of the number of 
    rows generated by each loop in a join.
<li>Added the [FTS4 notindexed option], allowing non-indexed columns in an FTS4 table.
<li>Added the [SQLITE_STMTSTATUS_VM_STEP] option to [sqlite3_stmt_status()].
<li>Added the "percentile()" function as a [loadable extension] in the ext/misc
    subdirectory of the source tree.
<li>Added the [SQLITE_ALLOW_URI_AUTHORITY] compile-time option.
<li>Add the [sqlite3_cancel_auto_extension(X)] interface.
<li>A running SELECT statement that lacks a FROM clause (or any other statement that
    never reads or writes from any database file) will not prevent a read
    transaction from closing.
<li>Add the [SQLITE_DEFAULT_AUTOMATIC_INDEX] compile-time option.  Setting this option
    to 0 disables automatic indices by default.
<li>Issue an [SQLITE_WARNING_AUTOINDEX] warning on the [SQLITE_CONFIG_LOG] whenever

</tcl>

<a name="enablefeatures"></a>
<h2>1.4 Options To Enable Features Normally Turned Off</h2>

<tcl>
COMPILE_OPTION {SQLITE_ALLOW_URI_AUTHORITY} {
  [URI filenames] normally throw an error is the authority section is
  not either empty or "localhost".  However, if SQLite is compiled with
  the SQLITE_ALLOW_URI_AUTHORITY compile-time option, then the URI is
  is converted into a Uniform Naming Convention (UNC) filename and passed
  down to the underlying operating system that way.  
  <p>
  Some future versions of SQLite may change to enable this feature
  by default.
}
COMPILE_OPTION {SQLITE_ALLOW_COVERING_INDEX_SCAN=<i>&lt;0 or 1&gt;</i>} {
  This C-preprocess macro determines the default setting of the
  [SQLITE_CONFIG_COVERING_INDEX_SCAN] configuration setting.  It defaults
  to 1 (on) which means that covering indices are used for full table
  scans where possible, in order to reduce I/O and improve performance.
  However, the use of a covering index for a full scan will cause results
  to appear in a different order from legacy, which could cause some

</p>

<ul>
<li> ^(The scheme of the URI must be "<tt>file:</tt>".  Any other scheme
     results in the input being treated as an ordinary filename.)^
<li> ^(The authority may be omitted, may be blank, or may be
      "<tt>localhost</tt>".  Any other authority results in an error.)^
      Exception: If SQLite is compiled with [SQLITE_ALLOW_URI_AUTHORITY]
      then any authority value other than "localhost" is passed through to the 
      underlying operating system as a UNC filename.
<li> ^The path is optional if the authority is present.  ^If the authority
     is omitted then the path is required. 
<li> ^The query string is optional.  ^If the query string is present, then
      all query parameters are passed through into the xOpen method of
      the underlying [VFS].  
<li> ^(The fragment is optional.  If present, it is ignored.)^
</ul>