SQLite

    pProbe = &sPk;
  }
  rSize = pTab->nRowLogEst;
  rLogSize = estLog(rSize);

#ifndef SQLITE_OMIT_AUTOMATIC_INDEX
  /* Automatic indexes */
  if( !pBuilder->pOrSet   /* Not part of an OR optimization */
   && (pWInfo->wctrlFlags & WHERE_NO_AUTOINDEX)==0
   && (pWInfo->pParse->db->flags & SQLITE_AutoIndex)!=0
   && pSrc->pIndex==0     /* Has no INDEXED BY clause */
   && !pSrc->notIndexed   /* Has no NOT INDEXED clause */
   && HasRowid(pTab)      /* Is not a WITHOUT ROWID table. (FIXME: Why not?) */
   && !pSrc->isCorrelated /* Not a correlated subquery */
   && !pSrc->isRecursive  /* Not a recursive common table expression. */
  ){
    /* Generate auto-index WhereLoops */
    WhereTerm *pTerm;
    WhereTerm *pWCEnd = pWC->a + pWC->nTerm;
    for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){
      if( pTerm->prereqRight & pNew->maskSelf ) continue;
      if( termCanDriveIndex(pTerm, pSrc, 0) ){

# 2014-10-24
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#*************************************************************************
#
# This file implements regression tests for SQLite library.  The
# focus of this script is testing automatic index creation logic,
# and specifically ensuring that automatic indexes can be used with
# co-routine subqueries.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Schema is from the Debian security database
#
do_execsql_test autoindex5-1.0 {
  CREATE TABLE source_package_status
          (bug_name TEXT NOT NULL,
           package INTEGER NOT NULL,
           vulnerable INTEGER NOT NULL,
           urgency TEXT NOT NULL,
           PRIMARY KEY (bug_name, package));
  CREATE INDEX source_package_status_package
              ON source_package_status(package);
  
  CREATE TABLE source_packages
              (name TEXT NOT NULL,
              release TEXT NOT NULL,
              subrelease TEXT NOT NULL,
              archive TEXT NOT NULL,
              version TEXT NOT NULL,
              version_id INTEGER NOT NULL DEFAULT 0,
              PRIMARY KEY (name, release, subrelease, archive));
  
  CREATE TABLE bugs
          (name TEXT NOT NULL PRIMARY KEY,
           cve_status TEXT NOT NULL
               CHECK (cve_status IN
                      ('', 'CANDIDATE', 'ASSIGNED', 'RESERVED', 'REJECTED')),
           not_for_us INTEGER NOT NULL CHECK (not_for_us IN (0, 1)),
           description TEXT NOT NULL,
           release_date TEXT NOT NULL,
           source_file TEXT NOT NULL,
           source_line INTEGER NOT NULL);
  
  CREATE TABLE package_notes
          (id INTEGER NOT NULL PRIMARY KEY,
           bug_name TEXT NOT NULL,
           package TEXT NOT NULL,
           fixed_version TEXT
               CHECK (fixed_version IS NULL OR fixed_version <> ''),
           fixed_version_id INTEGER NOT NULL DEFAULT 0,
           release TEXT NOT NULL,
           package_kind TEXT NOT NULL DEFAULT 'unknown',
           urgency TEXT NOT NULL,
           bug_origin TEXT NOT NULL DEFAULT '');
  CREATE INDEX package_notes_package
              ON package_notes(package);
  CREATE UNIQUE INDEX package_notes_bug
              ON package_notes(bug_name, package, release);
  
  CREATE TABLE debian_bugs
          (bug INTEGER NOT NULL,
           note INTEGER NOT NULL,
           PRIMARY KEY (bug, note));
  
  
  CREATE VIEW debian_cve AS
              SELECT DISTINCT debian_bugs.bug, st.bug_name
              FROM package_notes, debian_bugs, source_package_status AS st
              WHERE package_notes.bug_name = st.bug_name
              AND debian_bugs.note = package_notes.id
              ORDER BY debian_bugs.bug;
} {}

# The following query should use an automatic index for the view
# in FROM clause of the subquery of the second result column.
#
do_execsql_test autoindex5-1.1 {
  EXPLAIN QUERY PLAN
  SELECT
    st.bug_name,
    (SELECT ALL debian_cve.bug FROM debian_cve
      WHERE debian_cve.bug_name = st.bug_name
      ORDER BY debian_cve.bug),
    sp.release
  FROM
     source_package_status AS st,
     source_packages AS sp,
     bugs
  WHERE
     sp.rowid = st.package
     AND st.bug_name = bugs.name
     AND ( st.bug_name LIKE 'CVE-%' OR st.bug_name LIKE 'TEMP-%' )
     AND ( sp.release = 'sid' OR sp.release = 'stretch' OR sp.release = 'jessie'
            OR sp.release = 'wheezy' OR sp.release = 'squeeze' )
  ORDER BY sp.name, st.bug_name, sp.release, sp.subrelease;
} {/SEARCH SUBQUERY 2 USING AUTOMATIC COVERING INDEX .bug_name=/}
    

finish_test