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

Artifact 08551aa8956a91582979e17b6d369f321a5cb6ed6d3e952925a3e54e9e7de216:


# 2017 April 11
#
# 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.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix indexexpr2

do_execsql_test 1 {
  CREATE TABLE t1(a, b);
  INSERT INTO t1 VALUES(1, 'one');
  INSERT INTO t1 VALUES(2, 'two');
  INSERT INTO t1 VALUES(3, 'three');

  CREATE INDEX i1 ON t1(b || 'x');
}

do_execsql_test 1.1 {
  SELECT 'TWOX' == (b || 'x') FROM t1 WHERE (b || 'x')>'onex'
} {0 0}

do_execsql_test 1.2 {
  SELECT 'TWOX' == (b || 'x') COLLATE nocase  FROM t1 WHERE (b || 'x')>'onex'
} {0 1}

do_execsql_test 2.0 {
  CREATE INDEX i2 ON t1(a+1);
}

do_execsql_test 2.1 {
  SELECT a+1, quote(a+1) FROM t1 ORDER BY 1;
} {2 2 3 3 4 4}

#-------------------------------------------------------------------------
# At one point SQLite was incorrectly using indexes on expressions to
# optimize ORDER BY and GROUP BY clauses even when the collation
# sequences of the query and index did not match (ticket [e20dd54ab0e4]).
# The following tests - 3.* - attempt to verify that this has been fixed.
#

reset_db
do_execsql_test 3.1.0 {
  CREATE TABLE t1(a, b);
  CREATE INDEX i1 ON t1(a, b);
} {}

do_eqp_test 3.1.1 {
  SELECT b FROM t1 WHERE b IS NOT NULL AND a IS NULL 
  GROUP BY b COLLATE nocase
  ORDER BY b COLLATE nocase;
} {/USE TEMP B-TREE FOR GROUP BY/}

do_execsql_test 3.2.0 {
  CREATE TABLE t2(x);

  INSERT INTO t2 VALUES('.ABC');
  INSERT INTO t2 VALUES('.abcd');
  INSERT INTO t2 VALUES('.defg');
  INSERT INTO t2 VALUES('.DEF');
} {}

do_execsql_test 3.2.1 {
  SELECT x FROM t2 ORDER BY substr(x, 2) COLLATE nocase;
} {
  .ABC .abcd .DEF .defg
}

do_execsql_test 3.2.2 {
  CREATE INDEX i2 ON t2( substr(x, 2) );
  SELECT x FROM t2 ORDER BY substr(x, 2) COLLATE nocase;
} {
  .ABC .abcd .DEF .defg
}

do_execsql_test 3.3.0 {
  CREATE TABLE t3(x);
}

ifcapable json1 {
  do_eqp_test 3.3.1 {
    SELECT json_extract(x, '$.b') FROM t2 
    WHERE json_extract(x, '$.b') IS NOT NULL AND json_extract(x, '$.a') IS NULL 
    GROUP BY json_extract(x, '$.b') COLLATE nocase
    ORDER BY json_extract(x, '$.b') COLLATE nocase;
  } [string map {"\n  " \n} {
    QUERY PLAN
    |--SCAN TABLE t2
    `--USE TEMP B-TREE FOR GROUP BY
  }]
  
  do_execsql_test 3.3.2 {
    CREATE INDEX i3 ON t3(json_extract(x, '$.a'), json_extract(x, '$.b'));
  } {}
  
  do_eqp_test 3.3.3 {
    SELECT json_extract(x, '$.b') FROM t3 
    WHERE json_extract(x, '$.b') IS NOT NULL AND json_extract(x, '$.a') IS NULL 
    GROUP BY json_extract(x, '$.b') COLLATE nocase
    ORDER BY json_extract(x, '$.b') COLLATE nocase;
  } [string map {"\n  " \n} {
    QUERY PLAN
    |--SEARCH TABLE t3 USING INDEX i3 (<expr>=?)
    `--USE TEMP B-TREE FOR GROUP BY
  }]
}

do_execsql_test 3.4.0 {
  CREATE TABLE t4(a, b);
  INSERT INTO t4 VALUES('.ABC', 1);
  INSERT INTO t4 VALUES('.abc', 2);
  INSERT INTO t4 VALUES('.ABC', 3);
  INSERT INTO t4 VALUES('.abc', 4);
}

do_execsql_test 3.4.1 {
  SELECT * FROM t4 
  WHERE substr(a, 2) = 'abc' COLLATE NOCASE
  ORDER BY substr(a, 2), b;
} {
  .ABC 1   .ABC 3   .abc 2   .abc 4
}

do_execsql_test 3.4.2 {
  CREATE INDEX i4 ON t4( substr(a, 2) COLLATE NOCASE, b );
  SELECT * FROM t4 
  WHERE substr(a, 2) = 'abc' COLLATE NOCASE
  ORDER BY substr(a, 2), b;
} {
  .ABC 1   .ABC 3   .abc 2   .abc 4
}

do_execsql_test 3.4.3 {
  DROP INDEX i4;
  UPDATE t4 SET a = printf('%s%d',a,b);
  SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE nocase;
} {.ABC1 1 .abc2 2 .ABC3 3 .abc4 4}
do_execsql_test 3.4.4 {
  SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE binary;
} {.ABC1 1 .ABC3 3 .abc2 2 .abc4 4}

do_execsql_test 3.4.5 {
  CREATE INDEX i4 ON t4( Substr(a,-2) COLLATE nocase );
  SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE nocase;
} {.ABC1 1 .abc2 2 .ABC3 3 .abc4 4}
do_execsql_test 3.4.5eqp {
  EXPLAIN QUERY PLAN
  SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE nocase;
} {/SCAN TABLE t4 USING INDEX i4/}
do_execsql_test 3.4.6 {
  SELECT * FROM t4 ORDER BY Substr(a,-2) COLLATE binary;
} {.ABC1 1 .ABC3 3 .abc2 2 .abc4 4}


finish_test