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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact b04da5cee08a573c120c95781d7413a7e25ac8d5:


# 2008 December 23
#
# 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 file is testing the multi-index OR clause optimizer.
#
# $Id: where7.test,v 1.1 2008/12/23 23:56:22 drh Exp $

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

ifcapable !or_opt {
  finish_test
  return
}

# Evaluate SQL.  Return the result set followed by the
# and the number of full-scan steps.
#
proc count_steps {sql} {
  set r [db eval $sql]
  lappend r scan [db status step]
}

# Build some test data
#
do_test where7-1.1 {
  execsql {
    CREATE TABLE t1(a INTEGER PRIMARY KEY,b,c,d);
    INSERT INTO t1 VALUES(1,2,3,4);
    INSERT INTO t1 VALUES(2,3,4,5);
    INSERT INTO t1 VALUES(3,4,6,8);
    INSERT INTO t1 VALUES(4,5,10,15);
    INSERT INTO t1 VALUES(5,10,100,1000);
    CREATE INDEX t1b ON t1(b);
    CREATE INDEX t1c ON t1(c);
    SELECT * FROM t1;
  }
} {1 2 3 4 2 3 4 5 3 4 6 8 4 5 10 15 5 10 100 1000}
do_test where7-1.2 {
  count_steps {
    SELECT a FROM t1 WHERE b=3 OR c=6
  }
} {2 3 scan 0}
do_test where7-1.3 {
  count_steps {
    SELECT a FROM t1 WHERE b=3 OR +c=6
  }
} {2 3 scan 4}
do_test where7-1.4 {
  count_steps {
    SELECT a FROM t1 WHERE +b=3 OR c=6
  }
} {2 3 scan 4}
do_test where7-1.5 {
  count_steps {
    SELECT a FROM t1 WHERE 3=b OR c=6
  }
} {2 3 scan 0}
do_test where7-1.6 {
  count_steps {
    SELECT a FROM t1 WHERE (3=b OR c=6) AND +a>0
  }
} {2 3 scan 0}
do_test where7-1.7 {
  count_steps {
    SELECT a FROM t1 WHERE (b=3 OR c>10)
  }
} {2 5 scan 0}
do_test where7-1.8 {
  count_steps {
    SELECT a FROM t1 WHERE (b=3 OR c>=10)
  }
} {2 4 5 scan 0}
do_test where7-1.9 {
  count_steps {
    SELECT a FROM t1 WHERE (b=3 OR c>=10 OR c=4)
  }
} {2 4 5 scan 0}
do_test where7-1.10 {
  count_steps {
    SELECT a FROM t1 WHERE (b=3 OR c>=10 OR c=4 OR b>10)
  }
} {2 4 5 scan 0}


finish_test