# 2015-03-16
#
# 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 OR expressions where terms can be
# factored from either side of the OR and combined into a single new
# AND term that is beneficial to the search.  Examples:
#
#      (x>A OR x=A)              -->    ... AND (x>=A)
#      (x>A OR (x=A AND y>=B)    -->    ... AND (x>=A)
#



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

do_execsql_test 1.1 {
  CREATE TABLE t1(a,b,c);
  WITH RECURSIVE c(x) AS (VALUES(0) UNION ALL SELECT x+1 FROM c WHERE x<99)
    INSERT INTO t1(a,b,c) SELECT x, x/10, x%10 FROM c;
  CREATE INDEX t1bc ON t1(b,c);
  SELECT a FROM t1 WHERE b>9 OR b=9 ORDER BY +a;
} {90 91 92 93 94 95 96 97 98 99}
do_execsql_test 1.1eqp {
  EXPLAIN QUERY PLAN
  SELECT a FROM t1 WHERE b>9 OR b=9 ORDER BY +a;
} {/SEARCH t1 USING INDEX t1bc/}

do_execsql_test 1.2 {
  SELECT a FROM t1 WHERE b>8 OR (b=8 AND c>7) ORDER BY +a;
} {88 89 90 91 92 93 94 95 96 97 98 99}
do_execsql_test 1.2eqp {
  EXPLAIN QUERY PLAN
  SELECT a FROM t1 WHERE b>8 OR (b=8 AND c>7) ORDER BY +a;
} {/SEARCH t1 USING INDEX t1bc/}

do_execsql_test 1.3 {
  SELECT a FROM t1 WHERE (b=8 AND c>7) OR b>8 ORDER BY +a;
} {88 89 90 91 92 93 94 95 96 97 98 99}
do_execsql_test 1.3eqp {
  EXPLAIN QUERY PLAN
  SELECT a FROM t1 WHERE (b=8 AND c>7) OR b>8 ORDER BY +a;
} {/SEARCH t1 USING INDEX t1bc/}

do_execsql_test 1.4 {
  SELECT a FROM t1 WHERE (b=8 AND c>7) OR 8<b ORDER BY +a;
} {88 89 90 91 92 93 94 95 96 97 98 99}
do_execsql_test 1.4eqp {
  EXPLAIN QUERY PLAN
  SELECT a FROM t1 WHERE (b=8 AND c>7) OR 8<b ORDER BY +a;
} {/SEARCH t1 USING INDEX t1bc/}

do_execsql_test 1.5 {
  SELECT a FROM t1 WHERE (b=8 AND c>7) OR (b>8 AND c NOT IN (4,5,6))
   ORDER BY +a;
} {88 89 90 91 92 93 97 98 99}
do_execsql_test 1.5eqp {
  EXPLAIN QUERY PLAN
  SELECT a FROM t1 WHERE (b=8 AND c>7) OR (b>8 AND c NOT IN (4,5,6))
   ORDER BY +a;
} {/SEARCH t1 USING INDEX t1bc/}

# https://sqlite.org/forum/forumpost/2026-01-16T11:35:28Z
do_execsql_test 2.1 {
  DROP TABLE t1;
  CREATE TABLE t0(x COLLATE NOCASE);
  CREATE INDEX t0x ON t0(x);
  CREATE TABLE t1(y);
  INSERT INTO t0 VALUES('a');
  INSERT INTO t1 VALUES('AB');
  SELECT count(*) FROM t0, t1 WHERE (y BETWEEN 1 AND x) OR (x>=y AND x);
  SELECT count(*) FROM t0, t1 WHERE (x>=y AND x) OR (y BETWEEN 1 AND x);
} {1 1}


finish_test
